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S.No Question Option A Option B Option C Option D Answer Solution Comments Status Action
1 The pressure at the inlet of a refrigerant compressor is called _________. suction pressure discharge pressure back pressure critical pressure a The absolute pressure at which the refrigerant enters the compressor is called Suction pressure. Comments Active
2 The Molten metal is used in ___________ process Machining Forging Casting Deep Drawing c Casting: This is a manufacturing process where a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a casting, which is ejected or broken out of the mold to complete the process. Metals such as iron, aluminum, magnesium, and copper alloys are commonly used in casting due to their melting points.
Casting is often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods. The molten metal is poured into the mould and once it cools, it hardens into the shape of the mould.		 Comments Active
3 What will be the mass density of one litre of a fluid which weighs 9.81 N? (Take g =9.81 m/sec2) 100 gm/cm3 1000 kg/m3 1000 gm/cm3 100 kg/m3 b Given
\(V=1l=10^{-3}m^{3}\)
\(W=9.81 N\)
\(g=9.8 m/s^{2}\)
\(m=\frac{W}{g}\)
\(m=\frac{9.81}{9.81}=1m/s^{2}\)
\(ρ=\frac{m}{vol}=\frac{1}{10^{-3}}\)
\(ρ=1000 kg/m^{3}\)		 Comments Active
4 What is the hydraulic radius for a circular pipe running full? d 0.25d 0.5d 0.75d b The hydraulic radius for a circular pipe running full will be d/4 or 0.25d
Q408. What will be the mass density of one litre of a fluid which weighs 9.81 N? (Take g =9.81 m/sec2)		 Comments Active
5 The highest temperature during the cycle, in a vapour compression refrigeration system, occurs after: Compression Evaporation Expansion Condensation a
The highest temperature (T2) of the refrigerant during the cycle occurs after compression.		 Comments Active
6 A body of weight 100 N is lying on a rough horizontal surface, and the horizontal force of 50 N is applied on the body as shown in the figure, which is just enough to move the body. What will be the coefficient of friction?
 0.3 0.4 0.6 0.5 d Coefficient of friction defined as the limiting friction force to the normal reaction.
\(μ=\frac{F}{N}=\frac{50}{100}=0.2\)
 Comments Active
7 The following Temperature – Entropy diagram represents a Refrigeration system operates on the reversed Carnot cycle. The higher temperature of the refrigerant in the system is 35°C and the lower temperature is -15°C. What will be the C.O.P?
 3.45 5.16 4.82 2.75 b \(COP=\frac{258}{308-258}=\frac{258}{50}=5.16 \) Comments Active
8 The correct relation between the modulus of elasticity (E) and modulus of rigidity (G)is:Given, μ = Poisson’s ratio. E = 4G(1 + μ) G = 2E(1 + μ) E = 2G(1 + μ) G = 4E(1 + μ) c relation between the modulus of elasticity (E) and modulus of rigidity (G) and Poisson’s ratio.
E = 2G(1 + μ)		 Comments Active
9 The flow through a capillary tube is an example of ____________ flow. Laminar Transition Turbulent Compressible a Capillary flow is the spontaneous wicking of liquids in narrow spaces without the assistance of external forces. Examples of capillary action in water include water moving up a straw or glass tube, moving through a paper or cloth towel, moving through a plant, and tears moving through tear ducts. Comments Active
10 An air standard diesel cycle working with a compression ratio of 13 and cut off takes places at 5 % of the stroke volume. The value of cut off ratio will be 1.3 1.9 2.3 1.6 d Compression ratio (r) = \(\frac{V_{1}}{V_{2}}=13\)
\(V_{3}-V_{2}=6% of stroke\)
\(=0.06(V_{1}-V_{2})\)
\(=0.06(13V_{2}-V_{2})\)
\(=12V_{2}×0.06\)
\(V_{3}-V_{2}=0.72V_{2}\)
\(V_{3}=1.72V_{2}\)
\(\frac{V_{3}}{V_{2}}=1.72=cut off ratio\)		 Comments Active
11 In an ammonia vapour compression system, the pressure in the evaporator is 2 bar. Ammonia at exit is 0.85 dry and at entry its dryness fraction is 0.19. During compression, the work done per kg of ammonia is 150 kJ. The latent heat and specific volume at 2 bar are 1325 kJ/kg and 0.58 m3 /kg, respectively. What will be its C.O.P? 6.74 4.34 3.82 5.83 d \(P_{1}=P_{4}=2bar\)
\(x_{1}=0.85\)
\(x_{4}=0.19\)
\(W=150 KJ/kg\)
\(h_{fg}=1325 kJ/kg\)
\(V_{g}=0.58\)
Enthalpy at entry (h4)
\(h_{4}=x_{4}×h_{fg}\)
\(=0.19×1325=251.75 KJ/kg\)
Enthalpy at exit
\(h_{1}=x_{4}×h_{fg}\)
\(=0.85×1325=1126.25KJ/kg\)
Heat expected from the evaporator or refrigerating effect
\(R_{E}=h_{1}-h_{4}=1126.5-251.75\)
\(R_{E}=874.5 KJ/KG\)
We Know that work done during compression.
\(W=150 KJ/kg\)
\(COP=R_{E}×W=874.5/150=5.83\)
\(COP=5.83\)		 Comments Active
12 The speed ratio of a compound gear train is defined as _______. \(\frac{Product of no of teeth on driven shaft}{Product of number of teeth on driver shaft}\) \(\frac{speed of last follower}{speed of first driver}\) \(\frac{Product of no of teeth on driver shaft}{Product of number of teeth on driven shaft}\) \(\frac{Product of speed of followers}{Product of speed of drivers}\) a Speed Ratio = \(\frac{Speed of driver shaft}{Speed of driven shaft}=\frac{Product of teeth on driven shafts}{Product of teeth on driver shafts}\) Comments Active
13 The value of enthalpy of vaporisation approaches to zero on the saturation curve of water on a temperature entropy diagram: at critical point below critical point never approaches to zero above critical point a As pressure increases, the enthalpy of vaporization decreases, and at the critical point saturated water directly converted into saturated steam hence enthalpy of vaporization is zero at the critical point. Comments Active
14 For the same compression ratio, which of the following processes will require the least compression work? Adiabatic process Isochoric process Isothermal process Polytropic process c Compression is simply increasing gas pressure. If no heat is added or taken away during compression, the process is called adiabatic compression. If heat is added or taken away to maintain the gas at a constant temperature, the process is called isothermal compression.
Isothermal compression is more efficient than adiabatic compression because no energy goes into raising the temperature of the gas, hence all of the energy input goes into raising the gas pressure.
The shaded area on the above graph is smaller than that for adiabatic compression, because less energy is required for isothermal compression.
 Comments Active
15 The duplex feed pump is: Axial-flow pump Double-acting reciprocating pump Single-acting reciprocating pump Centrifugal pump b  The duplex feed pump is a reciprocating pump that is used to supply feedwater to a steam boiler. It consists of two sets of pistons and suction/discharge valves, which operate in a coordinated manner to ensure a continuous supply of water to the boiler. Comments Active
16 If Q1 is the heat rejected to the source and Q2 is the heat extracted from the sink, the coefficient of performance (COP) of a heat pump is given by _______. \(\frac{Q_{1}-Q_{2}}{Q_{1}}\) \(\frac{Q_{1}-Q_{2}}{Q_{2}}\) \(\frac{Q_{2}}{Q_{1}-Q_{2}}\) \(\frac{Q_{1}}{Q_{1}-Q_{2}}\) d COP for heat pump = \(\frac{Q_{1}}{Q_{1}-Q_{2}}\) Comments Active
17 In an I.C. engine, when the primary circuit in the coil ignition system breaks, the voltage produced across the secondary terminal is in the range of _______. 800 V to 1200 V 80 V to 120 V 2000 V to 5000 V 8000 V to 12,000 V d Ignition system:
All spark ignition engines require and ignition system to ignite a fuel mixture in the cylinder.
A very high voltage is required to generate sparks to ignite the cylinder charge at the set time.
Two types of ignition systems are used:
Battery/coil ignition system
Magneto ignition system
Ignition coil:
It is used to step up low voltage to high voltage to generate sparks.
It consists of two windings, one is wound over a soft iron core.
The secondary winding is grounded over the core. It consists of about 21, 000 turns.
One end of the windings is connected to the secondary terminal and the other end of the primary winding.
The primary winding is wound over the secondary winding and consists of about 200 – 300 turns.
One end of the windings is connected to the secondary terminal and the other end of the primary winding.
The end are connected to the external terminal the bakelite cap insulates the secondary terminal from the container and primary terminals.
In an internal combustion (IC) engine with a coil ignition system, the primary circuit is connected to the battery and is responsible for building up magnetic field energy in the ignition coil.
When the primary circuit is interrupted, the collapse of the magnetic field induces a high voltage (ranging 8000 V to 12000 V) across the secondary terminal of the ignition coil.
This high voltage is necessary to create a spark at the spark plug, which ignites the air – fuel mixture in the engine cylinder.
The voltage produced across the secondary terminal of the ignition coil can be quite high, typically in the range of several thousand volts.
The exact voltage depends on various factors, including the design of the ignition coil, the resistance and inductance of the primary and secondary circuits, and the specific conditions at the moment of ignition.		 Comments Active
18 Due to the refinement of grains, mechanical properties such as toughness, ductility, elongation and reduction in the area are improved in ___________ process. Hot working Cold working Forming Joining a Hot working or Hot forming:
• Plastic deformation of metal carried out at a temperature above the recrystallization temperature is called hot working.
• Under the action of heat and force, when the atoms of metal reach a certain higher energy level, the new crystals start forming. This is called recrystallization.
• In hot working, the temperature at which the working is completed is • critical since any extra heat left in the material after working will promote grain growth, leading to poor mechanical properties of a material.
In comparison with cold working, the advantages of hot working are
No strain hardening
Lesser forces are required for deformation
Greater ductility of material is available, and therefore more deformation is possible
Favourable grain size is obtained leading to better mechanical properties of a material
Equipment of lesser power is needed
No residual stresses in the material		 Comments Active
19 Following figure shows which of the following parts of a steam generator
 Feed check valve Blow-off cock Steam stop valve Safety valve c Comments Active
20 In the shaping process, the cutting tool moves _________. in a circular motion in a straight line in an elliptical motion in a parabolic motion b Shaper is a reciprocating type of machine tool in which the ram moves the
cutting tool backwards and forwards in a straight line. • These surfaces may be horizontal, vertical, or inclined. In general, the shaper can produce any surface composed of straight-line elements. A shaper is used to generate flat (plane) surfaces by means of a single- point cutting tool similar to a lathe tool.		 Comments Active
21 Natural draft cooling towers are also known as ______. automatic spray cooling towers mechanical draft cooling towers atmospheric cooling towers artificial cooling towers c The natural draft cooling tower is a type of direct-contact cooling tower that is open to the air. It uses the principle of the heat exchanger to allow hot water from the system to be cooled by coming in direct contact with fresh air. Comments Active
22 Which of the following is NOT a type of wet sump lubrication system? Pressure lubrication system Mist lubricating system Splash lubrication system Pump lubrication system b Wet sump lubrication system:
In the wet sump system, the bottom of the crankcase contains an oil pan or sump from which the lubricating oil is pumped to various engine components by a pump. After lubricating these parts, the oil flows back to the sump by gravity. There are three varieties in the wet – sump lubrication system.
The splash system
The splash and pressure system
The pressure feed system		 Comments Active
23 Which of following losses fall into the category of major losses? Head loss due to sudden enlargement Head loss due to friction Head loss due to sudden contraction Head loss due to bend of pipe b Frictional losses are a significant type of major loss in fluid flow. These losses occur due to the resistance encountered by the fluid as it flows through pipes or channels. Comments Active
24 The value of atmospheric pressure in bar is _______________. 1.5643 0.9874 2.01324 1.01325 d Atmospheric air pressure where standard atmospheric pressure is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about 14.7 pounds per square inch. Comments Active
25 The pressure responsive element in the Bourdon tube pressure gauge is made of_________. Bronze cast iron aluminium Inconel a Depending on the requirement, the pressure elements are made of copper alloys (bronze), stainless steels or special materials such as Monel. Comments Active
26 Which of the following is NOT a component of the water-cooling system with radiator? Fan Centrifugal pump Condenser Thermostat c Condenser is not used in water cooling system.
Thermostat used to control temperature of cooling water.
Centrifugal pump used to circulate water.
Fan used to cool the cooling water trough radiator.		 Comments Active
27 The speed ratio for an impulse turbine can be taken as __________. 0.45 0.6 0.75 0.3 a Speed ratio is defined as the ratio of tangential velocity of vane tip to 2 g H n e t . For Pelton turbines, it is in the range of 0.45 to 0.5. For Kaplan turbines, it is in the range of 1.4 to 2. Comments Active
28 Francis turbine is as example of: mixed flow turbine radial flow turbine axial flow turbine impulse turbine a  Reaction Turbine: If at the inlet of the turbine, the water possesses kinetic energy as well as pressure energy, the turbine is known as a reaction turbine. e.g. e Francis and Kaplan turbine. Comments Active
29 Which of the following statements is true for a throttling process? It is a reversible process It is an isothermal process. It is a constant enthalpy process. It is an isentropic process. c Throttling is done in an insulated pipe with a partially open valve. i.e. enthalpy remains constant. It is an adiabatic steady flow process: This statement is generally true. Comments Active
30 The net effect of superheating after compression in vapour compression refrigeration cycle is to have: high C.O. P decrease in refrigeration effect low C.O.P decrease in refrigeration capacity c Superheating increases the refrigerating effect and amount of work supplied to the compressor. Since the increase in refrigerating effect is less as compared to the increase in work supplied, the net effect of superheating is to reduce COP. Comments Active
31 Find the enthalpy of 1 kg of dry and saturated steam at 10 bar if sensible heat at 10 baris 762.8 kJ/kg and latent heat of evaporation at 10 bar is 2015.3 kJ/kg. 1252.5 kJ 762.8 kJ 2015.3 kJ 2778.1 kJ d Mass of dry and saturated steam, m = 1 kg, h = 762.8 kJ/kg, h = 2015.3 kJ/kg, P = 10 bar
∵ Here substance is dry and saturated steam, therefore dryness fraction of dry and saturated steam will be 1.
So, x = 1 H = 1 × [762.8 + 1 × 2015.3]
⇒ H = 2778.1 kJ		 Comments Active
32 The cyclic integral of Q/T for a reversible cycle is equal to zero. This statement is known as _________. Clausius theorem Carnot theorem the principle of Carathéodory Rankine theorem a Clausius Statement from the second law of thermodynamics states that: “It is impossible to design a device which works on a cycle and produces no effect other than heat transfer from a cold body to a hot body.” That is, heat transfer can only occur spontaneously in the direction of temperature decrease. Comments Active
33 The ratio of the energy received by the steam to the energy supplied by the fuel to produce steam in a steam boiler is known as __________. actual evaporation equivalent evaporation boiler horsepower boiler efficiency d Boiler efficiency is a measure of the goodness of the chosen process and equipment to transfer combustion heat to the heat in steam. Boiler efficiency can be defined as the ratio of the useful heat output to the total energy input. Comments Active
34 The enthalpy of water is considered as ‘zero’ at _______. 100°C 37°C 0.01°C 4°C c For water, the triple point (T = 0.01 oC and P = 0.6113 kPa) is selected as the reference state, where the internal energy and entropy of saturated liquid are assigned a zero value.
At triple point, u = 0, but p x v 0 \(≠\)
Therefore at the triple point. \(h≠0\)		 Comments Active
35 The frictional resistance in a turbulent flow is independent of the __________. surface roughness pressure velocity of fluid density of fluid b The Darcy-Weisbach equation is one of the most commonly used equations for estimating frictional pressure drops in internal flows.
hf = \(\frac{fLV^{2}}{2gD}\)		 Comments Active
36 In a steam boiler, an economiser is used for heating of ________. Feedwater Fuel flue gases air a Economizer uses the heat of exhaust flue gases to raise the temperature of incoming water in the boiler. Economizer increases the efficiency of Power Plant and reduces fuel consumption. Comments Active
37 The property of tool material to retain its hardness at elevated temperature is known as: Plasticity Toughness Elasticity Red hardness d Hot hardness or red hardness: It is the ability of the cutting tool to withstand high temperatures without losing its cutting edge. The red hardness of the tool materials can be increased by adding chromium, molybdenum, tungsten and vanadium, all of which from hard carbides. Comments Active
38 Vapour pressure is primarily associated with which phenomenon? Capillarity Surging Cavitation Water hammering c Cavitation in fluid mechanics and engineering normally refers to the phenomenon in which the static pressure of a liquid reduces to below the liquid's vapour pressure, leading to the formation of small vapor-filled cavities in the liquid. Comments Active
39 A centrifugal pump is running at the speed of 1000 rpm against a head of 40 m. If its speed is changed to 3000 rpm, then it will work against a head of: 40 m 360 m 80 m 120 m b \(H∝N^{2}D^{2}, \)
\(Q∝ND^{3},\)
\( P∝N^{3}D^{5},\)
\( \frac{H_{2}}{H_{1}}=(\frac{N_{2}}{N_{1}})^{2},\)
\( H_{2}=(\frac{3000}{1000})^{2}×40=360m\)		 Comments Active
40 Select the correct statement of Lami’s theorem. If three forces acting on a body are said to be in equilibrium, then each force isdirectly dependent on sine of the angle between the other two forces. If two forces are in equilibrium, then each force is directly proportional to sine of theangle between them. If three forces are non-coplanar, then each force is directly dependent on sine of theangle between the other two forces. If three forces are not in equilibrium, then each force is inversely proportional to sineof the angle between the other two forces. a LAMI'S Theorem states, "If three coplanar forces acting at a point be in equilibrium, then each force is proportional to the sine of the angle between the other two." Comments Active
41 A heat engine operates between a source at 600 K and a sink at 300 K. What is the maximum possible efficiency of the engine according to the Kelvin-Planck statement of the second law of thermodynamics? 50% 67% 33.3% 25% a Given
\(T_{1}=600K\)
\(T_{2}=300K\)
For maximum possible efficiency, we apply the formula of efficiency for carnot engine.
\(η_{carnot}=1-\frac{T_{2}}{T_{1}}\)
\(=1-\frac{300}{600}\)
\(η_{c}=50%\)		 Comments Active
42 The mass of water evaporated per unit mass of fuel burnt is termed as _________steam boilers. actual evaporation in boiler performance of equivalent evaporation in boiler efficiency of a The evaporative capacity of a boiler is the amount of water evaporated in kg per kg of fuel burnt. It is an important parameter in the design and operation of boilers as it determines the efficiency of the boiler. The higher the evaporative capacity, the higher the efficiency of the boiler. Comments Active
43 Which thermodynamic property of steam does NOT change in throttling calorimeter? Entropy Pressure Temperature Enthalpy d In the throttling process enthalpy remains constant, and work done is zero Comments Active
44 What will be the absolute pressure (approximately) at a point 3 m below the freesurface of a liquid having a density of 1530 kg/m3, if the atmospheric pressure isequivalent to 750 mm of mercury? (The specific gravity of mercury is 13.6 and densityof water is 1000 kg/m3, g = 9.81 m/sec2) 1,00,250N/m2 78,560N/m2 95,648 N/m2 1,45,090 N/m2 d Given
\(h=3m\)
\(ρ=1530 kg/m^{3}\)
\(g=9.81 m/s^{2}\)
\(h_{atm}=750 mm of mercury\)
\(S_{m}=13.6\)
\(ρ_{w}=1000 kg/m^{3}\)
\(P_{g}=ρgh\)
\(P_{g}=1530×9.81×3\)
\(P_{g}=45027.9 N/m^{2}\)
\(P_{abs}=P_{atm}+P_{gauge}\)
\(S_{1}h_{1}=S_{m}h_{m}\)
\(1.53×h_{1}=13.6×0.750\)
\(h_{1}=6.66m\) \(P_{atm}=100062 N/m\)
\(P_{abs}=P_{gauge}+P_{atm}\)
\(P_{abs}=45027.9+100062\)
\(P_{abs}=145089.9 N/m^{2}\)		 Comments Active
45 Which impellers are more likely to be clogged if stringy material or solids arepumped? Closed impeller Cannot be predicted Semi-open impeller Open impeller a Closed impellers (Two-sides shrouded):
• In the closed or shrouded impellers, the vanes are covered with shrouds (side plates) on both sidese plates)
• This type of acids impeller is meant to pump only clear water, hot water and
Open impeller:
• In open impeller, no shroud or plate is provided on either side Le. the vanes are open on both sides to perform
• Such pumps are used where the pump has a very rough duty i.e. to handle abrasive liquids such as a mixture of water, sand, pebbles and clay, wherein the solid contents may be as high as 25%
• This type of impeller is very well suited to handling slurries and other  		 Comments Active
46 If the mechanical efficiency and hydraulic efficiency of a turbine are 60% and 70%,respectively, then what will be the overall efficiency of the turbine? 70% 42% 65% 60% b  

overall efficiency=hydraulic efficiency X mechanical efficiency
=.70X.60= 42%		 Comments Active
47 Which of the following milling operations is used to produce a flat surface parallel tothe axis of rotation of the cutter? End milling Profile milling Face milling Plain milling d
Plain milling or slab milling: It is a method of producing a plain, flat, horizontal surface parallel to the axis of rotation of the cutter.		 Comments Active
48 Which of the following is a water-tube boiler? Cornish boiler Lancashire boiler Babcock & Wilcox boiler Cochran boiler c Babcock and Wilcox Boiler was discovered by George Herman Babcock and Stephen Wilcox in the year 1967. This is a water tube boiler, used in steam power plants. In this type of boiler, water is circulated inside the tubes and hot gases flow over the tubes. Comments Active
49 Which of the following machining operations is NOT related to turning? External threading Facing Boring Shaping d Turning is a machining process where a lathe is used to rotate the metal while a cutting tool moves in a linear motion to remove metal along the diameter, creating a cylindrical shape. The cutting tool can be angled differently to create different forms.
Shaping is used to change the size and shape of a workpiece.		 Comments Active
50 Which of the following statements is correct for compressibility? Compressibility is reciprocal of bulk modulus Compressibility is square of bulk modulus Compressibility is square root of bulk modulus Compressibility is equal to bulk modulus a Compressibility is reciprocal of bulk modulus. Comments Active
51 What is the function of the transfer port inside the engine? It is used to transfer unburnt fuel to the exhaust port. It is used to move charge from the crankcase to the cylinder head portion. It is the port through which the engine gets the fuel. It is the port through which scavenging of the gases takes place. b Transfer Port: The transfer port is located inside the engine, it is used for transferring the charge from the crankcase to the cylinder head portion through the descending piston. Generally, this port is uncovered 50 degree before BDC and covered 50 degree after BDC. Comments Active
52 Choose the correct mathematical relation of absolute pressure. \(P_{abs}=P_{atm}-P_{gauge}\) \( P_{abs}=P_{atm}+2P_{gauge}\) \( P_{abs}=P_{atm}/P_{gauge}\) \( P_{abs}=P_{atm}+P_{gauge}\) d The total pressure, or absolute pressure, is thus the sum of gauge pressure and atmospheric pressure:
Pabs =Pg + Patm		 Comments Active
53 Which of the following air-cooled condensers are used only in small capacity applications such as domestic refrigerators and room air conditioners? Natural convection air-cooled condensers Remote air-cooled condensers Shell and coil condensers Base mounted air-cooled condensers a The buoyant force on a submerged or floating body is equal to the weight of the liquid displaced by the body and acts vertically upward through the centroid of a displaced volume known as the centre of buoyancy. Centre of pressure is defined as the point of application of the total pressure on the surface. Comments Active
54 The position of centre of pressure depends on which of the following? Location of object from the free surface Surface tension of fluid Weight of the object immersed in liquid Velocity of liquid a Comments Active
55 The dimensional formula of specific gravity is given by: \(M^{0}L^{0}T^{0}\) \(M^{2}L^{-3}T^{-2}\) \(M^{1}L^{-3}T^{-2}\) \(M^{1}L^{-3}T^{0}\) a There is no S.I. unit of specific gravity since it is a dimensionless quantity. Therefore, the dimensional formula of specific gravity [M0L0T0]. Comments Active
56 A cyclic heat engine of thermal efficiency 80% does 60 kJ of work per cycle. The heat rejected per cycle will be equal to __________. 15 kJ 48 kJ 20 kJ 75 kJ a \(η_{th}=0.8\)
\(W=60 KJ\)
\(Q_{Rej}= ?\)
We know
\(η_{th}=\frac{W}{Q_{in}}\)
\(0.8=\frac{60}{Q_{in}}\)
\(Q_{in}=\frac{60}{0.8}\)
\(Q_{in}=75 KJ\)
\(W=Q_{in}-Q_{rej}\)
\(60=75-Q_{rej}\)
\(Q_{rej}=75-60\)
\(Q_{rej}=15 KJ\)		 Comments Active
57 The term ρV2 /2 used in Bernoulli theorem is basically: stagnation pressure dynamic pressure hydrostatic pressure static pressure b BERNOULLI'S THEOREM
Bernoulli's theorem which is also known as Bernoulli's principle, states that an increase in the speed of moving air or a flowing fluid is accompanied by a decrease in the air or fluid's pressure or sum of the kinetic (velocity head), pressure(static head) and Potential energy energy of the fluid at any point remains constant, provided that the flow is steady, irrotational, and frictionless and the fluid is incompressible.		 Comments Active
58 There are two horizontal pipes in which water is flowing. If we have to find the pressure difference between these two horizontal pipes using an inverted manometer, and two manometric fluids with specific gravities of 13.5 and 0.9 are available, then which manometric fluid will be appropriate? Fluid with the specific gravity of 0.9 Cannot be predicted Both the fluids can be used Fluid with the specific gravity of 13.5 a Differential inverted U – tube manometer:
It consists of an inverted U – tube containing a light liquid.
The two ends of the tube are connected to the points whose difference is to be measured.
It is used for measuring the difference of pressure between two points in the flow section to which it is connected.
It is used in two conditions
* In underground pipeline
* When the specific gravity of manometric fluid is less than 1
 Comments Active
59 For hydraulic turbines, the ratio of overall efficiency and mechanical efficiency is called _________ . frictional power cannot be predicted volumetric efficiency hydraulic efficiency d
overall efficiency=hydraulic efficiency X mechanical efficiency overall efficiency/ mechanical efficiency= hydraulic efficiency		 Comments Active
60 Which of the following statements is correct about a working engine? Operation of the flywheel is continuous, whereas operation of the governor is more or less intermittent. Operation of both the flywheel and the governor is continuous. Operation of the governor is continuous, whereas operation of the flywheel is more or less intermittent Operation of both the flywheel and the governor is intermittent. a Flywheel:
The flywheel is mounted on the engine crankshaft.
A large ring gear has attached to the flywheel.
The flywheel is bolted to a cover that carries a pressure plate, pressure springs, and releases levers.
The entire assembly of the flywheel and the cover rotate all the time.
When an automatic transmission is used the torque converter assembly acts as the flywheel.
A flywheel is constantly rotating, even when the power source driving it fluctuates.
It acts as a reservoir of kinetic energy, absorbing excess energy during periods of high power and releasing it during periods of low power, thus smoothing out the overall power output.
The flywheel acts as a passive and continuous stabilizer.
The flywheel stored energy during the power stroke is supplied to the crankshaft during the idle stroke i.e. suction, compression, and exhaust.
It serves as a mounting and frictional surface for clutch assembly.
Governors:
A mechanism used to control the speed of an engine is called the governor.
A governor is a speed – sensitive device.
The governor is a devide for holding any speed steady between idling and maximu speed.
The fuel injection pump operates in conjunction with a governor, which is required to control the injected quantity of fuel so that the engien neither stalls when ideling nor exceeds the maximum speed for which it is designed.
Unlike the flywheel, a governor doesn’s operate continuously.
It typically comes into action only when the system’s actual rotational speed deviates from the desired setpoint.
The governor acts as an active and intermittent regulator.		 Comments Active
61 For a two-stage reciprocating air compressor, the section pressure is 1.6 bar and the delivery pressure is 40 bar. What is the value of the ideal intercooler pressure (in bar)? 8 20.8 4.56 9 a Given
\(P_{1}=1.6 bar\)
\(P_{2}=40 bar\)
\(P_{intercooler}=P_{1}×P_{2}\)
\(P_{i}=1.6×40\)
\(P_{i}=64\)
\(P_{i}=8 bar\)		 Comments Active
62 The point at which all the three phases – solid, liquid, and vapour co-exist in equilibrium in a p-T diagram is known as ________. boiling point melting point triple point critical point c In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. Comments Active
63 A Carnot cycle operates between two temperatures T1 and T2. The efficiency of the cycle is given by η = (T1 − T2) / T1. Which of the following statements is correct? The efficiency of the Carnot cycle is always greater than that of any other heat engine operating between the same two temperatures. The efficiency of the Carnot cycle depends on the working substance used. The efficiency of the Carnot cycle is always less than that of any other heat engine operating between the same two temperatures. The efficiency of the Carnot cycle is always equal to that of any other heat engine operating between the same two temperatures. a Carnot cycle: The ideal reversible cycle that has the highest possible efficiency among all heat engines is called the Carnot cycle.
The Carnot cycle is one of the best-known reversible cycles. The Carnot cycle is composed of four reversible processes.
• Carnot cycle consists of 2 isothermal and 2 adiabatic processes.
• An isothermal process is a very slow process and the adiabatic process is a very fast process and the combination of a slow process and a fast process is very difficult.
• So a Carnot cycle is also known as an impractical cycle. It is used only to compare other actual cycles.		 Comments Active
64 If a turbine is working under different heads, the behaviour of the turbine can be easily determined from the values of _______________. blade angles number of vanes unit quantities size of runner c The following are three important unit quantities.
Unit speed
Speed of turbine working under a unit head
\(N_{u}=\frac{N}{H}\)
Unit discharge
Discharge passing through a turbine which is working under a unit head
\(Q_{u}=\frac{Q}{H}\)
Unit power
Power developed by a turbine working under unit head
\(P_{u}=\frac{P}{H^{3/2}}\)		 Comments Active
65 Under steady state operation of a cone clutch, if semi-cone angle (α) decreases then _____________. does not affect the axial force the axial force increases the torque produced by clutch decreases the torque produced by clutch increases d • Under uniform pressure theory, torque transmitted by the cone clutch,
\(T=\frac{2}{3}×μW(\frac{r13-r23}{r12-r22})×cosecα\)
• Under uniform wear theory, torque transmitted by the cone clutch,
\(T=\frac{1}{2}×μW×(r_{1}+r_{2})×cosecα\)
• The value of is always greater than 1 for the range of cone angle of the conical clutch. \(cosecα\)
• Torque capacity is inversly proportional to the sine of the semi-cone angle (), so decreasing a will increase the maximum torque that the clutch can transmit. \(α\)		 Comments Active
66 A seamless pipe having a diameter of 600 mm and thickness of 9 mm, contain the fluid under a pressure of 4 MPa, find the longitudinal stress developed in the pipe. 88.8 Mpa 133.3 Mpa 66.6 Mpa 77.7 Mpa c Given
P = 4MPa
d = 600mm
t = 9mm
Apply relation
\(σ_{l}=\frac{Pd}{4t}\)
\(σ_{l}=\frac{4×600}{4×9}\)
\(σ_{l}=66.6 MPa\)		 Comments Active
67 A piezometer is connected to a point in a pipe to measure the pressure of water flowing through it. If the piezometer reads 0.4 m, what will be the gauge pressure at that point? Take atmospheric pressure = 101325 pascals and g = 10 m/s2 . 40 kilopascals 97325 pascals 105325 pascals 4000 pascals d Gauge Pressure = \(ρgh\)
Gauge Pressure for water = 1000 x 10 x 0.4
PGauge = 4000 Pa.		 Comments Active
68 For internal laminar flow, the variation of shear stress in the radial direction is: hyperbolic parabolic exponential linear d Shear stress is proportional to the radial distance from the centre of the pipe. Therefore, for laminar flow through a round pipe, the shear stress varies linearly with the radial distance. Comments Active
69 Choose the correct option related to lathe turning operation. Tool will rotate Both tool and work piece will not rotate Both tool and work piece will rotate Work piece will rotate d Turning is a process of removing excess material from the work-piece to produce an axisymmetric surface, in which the work-piece rotates in a spindle and the tool moves in a plane perpendicular to the surface velocity of the job at the tool-job contact point. Comments Active
70 In a steam boiler, the actual evaporation is 8 kg of steam per kg of fuel burnt. The heat supplied per kg of water is 2500 kJ/kg. Higher calorific value of fuel is 25,000 kJ/kg. What is the boiler efficiency? 0.75 0.10 0.80 0.25 c The actual evaporation is 8 kg of steam per kg of fuel burnt and the heat supplied per kg of water is 2500 kJ/kg.
So, Heat absorbed by water = actual evaporation * heat supplied per kg of water, which is 8 kg/kg ×  2500 kJ/kg = 20000 kJ/kg of fuel
The heat supplied by the fuel is the higher calorific value of the fuel, which is given as 25000 kJ/kg.
So, the boiler efficiency η = 20000 kJ/kg / 25000 kJ/kg = 0.80 or 80%		 Comments Active
71 A rectifier is fitted in an ammonia absorption plant to: remove the unwanted water vapour by cooling the vapour mixture and condensing the water vapour superheat ammonia vapour only remove the unwanted water vapour by cooling the vapour mixture remove the unwanted water vapour by heating the vapour mixture a The common vapour absorption refrigeration system is based on NH3 - H2O where NH3 is refrigerant and Hâ‚‚O is absorbent.
Ammonia vapour enters the absorber where it gets dissolved in water, this reaction is exothermic and a lot of heat is released. The solubility of Ammonia is inversely proportional to temperature hence cooling water is circulated to maintain the low temperature of the solution.
The solution rich in ammonia is pumped to the generator where the solution is heated and the ammonia vapour separates. The rectifier is installed for the complete removal of water vapour from ammonia vapour.		 Comments Active
72 If the specific weight of a fluid is 19620 N/m3 , then what will be its specific volume in m3 /kg? (Take g = 9.81 m/sec2) \(0.5×10^{-3}\) \(0.5×10^{-5}\) \(5×10^{-5}\) \(5×10^{-3}\) a Given
\(δ_{w}=19620 N/m^{3}\)
\(g=9.81 m/s^{2}\)
\(δ_{w}=\frac{mg}{V}\)
\(V=\frac{mg}{19620}\)
\(\frac{V}{m}=\frac{mg}{m×19620}=\frac{9.81}{19620}\)
Specific Volume \(=0.5×10^{-3} m^{3}/kg\)		 Comments Active
73 Flow process is used for which of the following systems? Open system Both open and closed systems Closed system Isolated system a The Flow Process is defined as the study of how thermodynamic properties like temperature, pressure, volume, and energy change as a fluid (liquid or a gas) moves through a mechanical system. This system, often referred to as a Control Volume, can be a turbine, compressor, nozzle, or any other engineering component. Comments Active
74 The energy loss caused by abrupt enlargement is expressed by: \((\frac{V_{1}-V_{2}}{2g})^{2}\) \( (\frac{V_{1}-V_{2}}{2})^{2}\) \( (\frac{V_{1}-V_{2}}{2g})^{2}\) \( (\frac{V_{1}-V_{2}}{g})^{2}\) C The energy loss caused by abrupt enlargement is expressed by . \(\frac{(V_{1}-V_{2})^{2}}{2g} or (\frac{V_{1}-V_{2}}{2g})^{2} \) Comments Active
75 Which of the following is the correct relation for specific speed of turbine? Specific speed is directly proportional to square root of shaft power Specific speed is directly proportional to shaft power Specific speed is directly proportional to head under which the turbine is working Specific speed is directly proportional to square of the head under which the turbine is working a \(\frac{NP}{H^{5}/4}\) Comments Active
76 When any gas is heated at constant pressure, its change in volume varies directly with change in absolute temperature. This law is known as ________. Boyle's law Charles' law Joule's law Avogadro's law b Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas when pressure is kept constant. Comments Active
77 According to the American Society of Mechanical Engineers (ASME), the evaporation of 15.63 kg of water at 100°C per hour from 100°C feedwater in a steam boiler is known as __________. boiler efficiency boiler horsepower actual evaporation equivalent evaporation b boiler horsepower is equal to the thermal energy rate required to evaporate 34.5 pounds (15.6 kg) of fresh water at 212 °F (100 °C) in one hour. Comments Active
78 In a mechanical draught system, draught is produced by a _____________. chimney chain grate stoker pump blower d Mechanical draft system means a venting system for a gas burning appliance that is designed to remove flue or vent gases by mechanical means, such as a fan, which may consist of an induced draft portion under non−positive static pressure or a forced draft portion under positive static pressure. Comments Active
79 The behaviour of a material at different stages of loading is represented by a diagram called the _________ diagram. circumferential stress hysteresis iron carbon stress strain d The behaviour of a material at different stages of loading is represented by a diagram called as stress–strain diagram. A stress–strain diagram of ductile material like mild steel is a conventional diagram to understand fully the load-deformation behaviour of a material. Comments Active
80 Which of the following statements is true about a four-stroke engine in comparison to a two-stroke engine? Thermal efficiency and part-load efficiency of a four-stroke engine are better than those of a two-stroke engine. A four-stroke engine only uses the diesel cycle, while a two-stroke engine only uses the Otto cycle. Volumetric efficiency of a four-stroke engine is comparatively low, due to less power output. Owing to one power stroke in two revolutions, a lighter flywheel is required. a Four stroke engine
Two – stroke engine
Four operations (suction, compression, power and exhaust) take place in the four strokes of the piston
The four operations take place in two strokes of the piston
It gives one power stroke in the four strokes, i.e. in two revolutions of the crankshaft. As such three strokes are idle strokes
The power stoke takes place in every two strokes i.e. one power stroke for one revolution of the crankshaft
Due to more idle strokes and non – uniform load on the crankshaft, a heavier flywheel is required
The engine has a more uniform load as every time the piston comes down it is the power stroke. As such a lighter flywheel is used
The engine has more parts such as valves and its operating mechanism. Therefore, the engine is heavier
The engine has no valve and valve operating mechanism; Therefore, it is lighter in weight
The engine is costlier as it has more parts
The engine is less expensive as it has a lesser number of parts
The engine efficiency is more as the charge gets completely burnt out. Consequently, fuel efficiency is more.
The efficiency is less. A portion of the charge escape through the exhaust port, and because of this, the fuel efficiency is less.		 Comments Active
81 In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is: reversed Otto cycle reversed Joule cycle reversed Carnot cycle reversed Brayton cycle d Reversed Brayton cycle used in the air refrigeration cycle which uses air as the refrigerant. It is used for air conditioning in aeroplanes. Comments Active
82 Which of the following statements is true regarding vapour-compression refrigeration system (VCRS)? Power consumption of VCRS with air cooled condenser is less as compared to that of VCRS with water cooled condenser VCRS with both water cooled and air cooled condenser will require same power for same refrigeration effect. Power consumption of VCRS with air cooled condenser is more as compared to that of VCRS with water cooled condenser. Power consumption of VCRS with air cooled condenser may be lesser or greater than that of VCRS with water cooled condenser. c There are three types of condenser
Air-cooled condensers use air as the cooling medium.
Water-cooled condenser uses water as the medium.
Evaporative condenser is a combination of both i.e. use both air and water.
Condensing Temperature: This is the temperature at which the refrigerant gas turns into its liquid state in the condenser. The air-cooled condenser is cooled by the ambient air. The ambient air temperature will be higher than the temperature of the water. The temperature of natural water is dependent on the ambient wet-bulb temperature which always is lower than the ambient dry bulb temperature. Hence the condensing temperature will be higher in air-cooled condenser than in a water- cooled condenser.		 Comments Active
83 The friction experienced by the body when the body tends to move is known as: sliding friction static friction dynamic friction rolling friction b • Static friction is present if displacing forces are acting on both bodies, but the bodies have not started to move relative to each other yet. It has to be overcome if we want to move a body.
• Dynamic friction occurs when a body moves along another and in contact with it, i.e. it actually rubs against it.
• Static friction occurs between non-moving surfaces and kinetic friction occurs between moving surfaces.
• Static friction prevents an object from moving whereas Kinetic friction opposes the sliding motion and tries to reduce the speed at which the surfaces slide across each other.
Analysis :- Till impending motion static friction will act.		 Comments Active
84 Which of the following does NOT describe the Diesel cycle? No spark plug needed High compression ratio Limited maximum temperature Constant volume heat addition d In diesel cycle constant pressure heat addition takes place.
Diesel cycle has four processes. They are:
Process 1 – 2: Isentropic (Reversible adiabatic) compression
Process 2 – 3: Constant pressure (Isobaric) Heat addition
Process 3 – 4: Isentropic (Reversible adiabatic) expansion
Process 4 – 1: Constant volume (isobaric) Heat rejection
 Comments Active
85 The air pre-heater increases the temperature of ___________ before it/they enter(s) the furnace. flue gases air feedwater fuel b Air Preheater: It is used to increase the temperature of the air before it enters the furnace. It is generally placed after the economizer; so that the flue gases pass through the economizer and then to the air preheater. Comments Active
86 Generation of steam in a boiler is an example of an _________. Isothermal process isochoric process adiabatic process isobaric process d Generation of steam in a boiler is an example of an isobaric process.
Common sense :- Generally we talk about what is the working pressure of specific boiler like for babcock wilcox boiler – 11.5 to 17.5 bar , stirling boiler –up to 60 bar, lamont boiler – 130 bar , loeffler boiler – 140 bar , bensen boiler – 225 to 250 bar pressure so we are giving specific fix value of working pressure. You can think like this in rankine cycle that is power plant cycle so at that place boiler is use and there process 4 to 1 is constant pressure heat addition process and will execute in boiler.
Why constant Pressure: - at const. pressure heat addition will increase the volume and external work will raise the temperature and that’s motive of boiler.		 Comments Active
87 An engine is working with temperature limits of 29°C and 229°C. It receives 1000 kW and rejects 429 kW of heat. Possible cycle executed by the engine is Reversible cycle Carnot cycle Irreversible cycle Impossible cycle d Given
\(T_{1}=29+273=302K\)
\(T_{2}=229+273=502 K\)
\(Q_{1}=1000 kW :Q_{2}=429 kW\)
\(η_{c}=\frac{T_{1}-T_{2}}{T_{1}}=\frac{502-302}{502}=0.398\)
\(η_{E}=\frac{Q_{1}-Q_{2}}{Q_{1}}=\frac{1000-429}{1000}=0.571\)
Hence
this cycle is impossible cycle \(η_{E}>η_{car}, \)		 Comments Active
88 Match the following
Halocarbon Refrigerants
Examples
1. Halons		 1-d; 2-c; 3-b; 4-a 1-d; 2-a; 3-c; 4-b 1-a; 2-c; 3-d; 4-b 1-d; 2-c; 3-a; 4-b d R-32, also known as difluoromethane or HFC-32, is a hydrofluorocarbon (HFC) refrigerant commonly used in air conditioning and refrigeration systems.
R-22, also known as chlorodifluoromethane (CHCIFâ‚‚), is a hydrochlorofluorocarbon (HCFC) refrigerant that was once widely used in air conditioning and refrigeration systems.
R-11, also known as trichlorofluoromethane (CCI3F), is a chlorofluorocarbon (CFC) refrigerant that was once widely used in air conditioning and refrigeration systems.
R-10, also known as carbon tetrachloride (CCl4), is a chlorofluorocarbon (CFC) that was once widely used as a refrigerant, fire suppressant, and solvent.		 Comments Active
89 Which turbine is suitable where a large discharge at low head is available? Francis turbine Kaplan turbine Pelton turbine Turgo turbine b  High head turbine: In this type of turbines, the net head varies from 150m to 2000m or even more, and these turbines require a small quantity of water. Example: Pelton wheel turbine.
Medium head turbine: The net head varies from 30m to 150m, and also these turbines require a moderate quantity of water.
Example: Francis turbine.
Low head turbine: The net head is less than 30m and also these turbines require a large quantity of water. Example: Kaplan turbine.		 Comments Active
90 In a lubrication method, the oil is kept in the crank case sump and it is splashed by using the end of a connecting rod to various components of the engine. This method is called _____. Pressure lubrication Splash lubrication Sump lubrication Pump lubrication b Used in light – duty, slow – speed engines (<250 rpm)
Lubricating oil is stored at the bottom of the engine crankcase and maintained at a predetermined level.
The oil is drawn by the pump and delivered through a distributing pipe into the splash trough located under the big end of all the connecting rods.
These troughs are provided with overflows and oil in the trough is therefore kept at a constant level.
A splasher or dipper is provided under each connecting rod cap which dips into oil in the trough located under the big end of all the connecting rods.
These troughs are provided with overflows and oil in the trough is therefore kept at a constant level.
A splasher or dipper is provided under each connecting rod cap which dips into oil in the trough at every revolution of the crankshaft and the oil is splashed all over the interior of the crankcase, into the pistons, and onto the exposed portion of cylinder walls.
The oil dripping from the cylinder is collected in the sump where it is cooled by the air flowing around. The cooled air is then recirculated.
A splash system of lubrication is employed for the camshaft, piston rings, and tappets.		 Comments Active
91 The function of condenser in refrigeration cooling system is _________. To give heat into the system To convert liquid refrigerant into vapor refrigerant To reject heat out of the system To give external work to the system c The function of the condenser in a refrigeration system is to transfer heat from the refrigerant to another medium, such as air and/or water. By rejecting heat, the gaseous refrigerant condenses to liquid inside the condenser. Comments Active
92 In the thermodynamic system, the primary driving force for mass transfer is __________. concentration difference pressure difference mass difference Temperature difference a Mass transfer, in a broad sense, is the net movement of mass from one location to another, often driven by variations in concentration or by thermal gradients within a physical system.
The primary driving force for mass transfer is the concentration difference. This is because substances naturally move from areas of higher concentration to areas of lower concentration, a process called diffusion. This happens because of the random motion of particles; particles in an area of high concentration are more likely to move to an area of low concentration than vice versa, simply due to probability.		 Comments Active
93 The Energy Gradient line will______. Coincide with pipe axis Lie below the Hydraulic Gradient line Coincide with Hydraulic Gradient line Lie above the Hydraulic Gradient line d A line that represents the elevation of energy head (in feet or meters) of water flowing in a pipe, conduit, or channel. The line is drawn above the hydraulic grade line (gradient) a distance equal to the velocity head (v2/2g) of the water flowing at each section or point along the pipe or channel. Comments Active
94 Pressure head of a fluid represents: Energy per unit length Energy per unit volume Energy per unit weight Energy per unit mass c Pressure head in fluid mechanics is the pressure exerted by a liquid column on the base of the container. It is represented as the height of the liquid column. Pressure head is also called static head or static pressure head which is represented by 'Z'. Comments Active
95 The expansion process in a vapor compression refrigeration cycle is a/an ___________. Isentropic process Isenthalpic process Constant volume process Reversible isothermal process b Expansion Valve: This device removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapour in the evaporator. It is a constant enthalpy process. Comments Active
96 The mass flow is same at inlet and outlet in case of ___________. Steady flow process Closed system Non-steady flow process Isolated system a If the boundary is stationary and the inlet and outlet mass flow rates are equal and do not change with time, the system is call the steady flow system. Comments Active
97 Which of the following statements is INCORRECT? The value of dryness fraction is 0 for saturated water condition. The value of dryness fraction always lies between 0 and 1. The value of dryness fraction is greater than 1 for superheated steam condition. The value of dryness fraction is 1 for saturated steam condition c Dryness fraction is defined as the ratio of mass of dry steam (vapour) to combined mass of dry steam (vapour) & mass of liquid in mixture. It is denoted by x. The value of dryness fraction lies between 0 and 1. Comments Active
98 Which of the following is the correct statement relating to the centre of pressure on an immersed surface? It is the point where the normal pressure acts. It is the point where the weight of body the acts. It is the point where the resultant pressure acts. It is the point where the weight of the body and resultant pressure acts. c The point of application of centre of pressure on a plane surface is known as centre of pressure. In case of a horizontal plane surface immersed in a liquid, the centre of pressure coincides with the centroid of the surface. Comments Active
99 ______ is a metalworking process which is an example of forging. Casting Extrusion Upsetting Welding c Upsetting
• Upsetting is the process of increasing the thickness of a bar with the corresponding reduction in length by applying the end pressure.
• The pressure is applied at the end of the bar against the angle clamped in position and then hammering against it.		 Comments Active
100 An oil of specific gravity 0.8 is flowing through a pipe. A differential manometer is connected at the two points, say A and B, and shows a difference in the mercury level as 20 cm. What will be the difference between the pressures at the two points? Take density of mercury = 13600 kg/m3 and g = 10 m/s2 1280 kN/m2 25.6 kN/m2 25.6 N/m2 2560 N/m2 b Given
\(δ_{o}=0.8\)
\(h=20cm=0.20 m\)
\(ρ_{hg}=13600 kg/m^{3}\)
\(ρ_{oil}=0.8×1000=800 kg/m^{3}\)
\(P_{A}+(800×g×(y+0.20))=P_{B}+(800×g×Y)+(0.20×g×13600)\)
\(P_{A}-P_{B}=(13600×g×0.20)-[800×g×0.20\)]
\(=25600 N/m^{2}\)
\(P_{A}-P_{B}=25.6 KN/m^{2}\)		 Comments Active