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S.No Question Option A Option B Option C Option D Answer Solution Comments Status Action
1 Endurance limit of steel is associated with ______number of cycles in fatigue loading. low infinite limited 1000 b It is defined as the maximum value of completely reversed bending stress which a polished standard specimen can withstand without failure, for an infinite number of cycles (usually 106 cycles). Hence for steel in fatigue loading the endurance limit is the maximum reversed bending stress it can withstand without failure for an infinite number of cycle. Comments Active
2 Reynolds number is directly proportional to Pipe diameter Average flow velocity Both A & B Neither A nor B c Comments Active
3 A beam, of 80mm x 120mm section and 4m long, is simply supported at ends. If it carries a load of 20kN at mid-span, what are the maximum shear force and bending moment acting on it? 20kN, 20kNm 20kN, 10kNm 10kN, 10 kNm 10kN, 20 kNm d L = 4 m, P = 20 kN.
Maximum shear force (F)
F = 0.5 × P
F = 0.5 × 20
F = 10 kN.
Maximum bending moment (MM)  
MM = \(\frac{P × L}{4}\)
MM = \(\frac{20 × 4}{4}\)
MM = 20 kNm.		 Comments Active
4 Aditya L1 is a___________. Long-range missile Spacecraft project Rocket to moon Light combat aircraft b Aditya-L1 is the first Indian space mission to observe the Sun and the solar corona. ISRO is planning to launch the Aditya-L1 mission, the first Indian space mission to observe the Sun by June/july 2023. Comments Active
5 Angle of ISO metric screw thread is 45° 55° 60° 47.5° c In the case of travelling through a vacuum, there is no fluid medium. In any propulsion system, a working fluid is accelerated by the system and the reaction to this acceleration produces a force on the system. Comments Active
6 _______engines can work in vacuum. Turbojet Rocket Turboprop Ramjet b In the case of travelling through a vacuum, there is no fluid medium. In any propulsion system, a working fluid is accelerated by the system and the reaction to this acceleration produces a force on the system. Comments Active
7 SI Unit of specific heat capacity is J/mk J/kg K J/kg J/K b Comments Active
8 Lower calorific value of Diesel is about 45,000kJ/kg 55,000kJ/kg 35,000kJ/kg None of these a Comments Active
9 ______regulations relate to industrial safety. FEMA OSHA COFEPOSA NASA b Comments Active
10 Equivalent evaporation of a boiler is defined with respect to generation of steam from & at______ 20°C 100°C 150°C Any of these b Comments Active
11 Young's modulus of elasticity of mild steel is ___approximately. 200 MPa 310 MPa 210 GPa 300 GPa c A hot-wire anemometer measures local instantaneous velocity profile in the boundary layer theory based on principles of heat transfer. However, it requires that the fluid itself be at a uniform temperature. It can be used to measure three components of velocity and velocity fluctuations arising in a turbulent flow. It is used in gas flows, while a hot-film is used for liquid flow. Comments Active
12 ________is useful instrument for finding velocity profile in the boundary layer. Hot-wire anemometer Rota meter Bourdon gauge Turbine meter a A hot-wire anemometer measures local instantaneous velocity profile in the boundary layer theory based on principles of heat transfer. However, it requires that the fluid itself be at a uniform temperature. It can be used to measure three components of velocity and velocity fluctuations arising in a turbulent flow. It is used in gas flows, while a hot-film is used for liquid flow. Comments Active
13 Cutting operations like blanking and piercing can be performed simultaneously in combination die simple die compound die progressive die c Comments Active
14 “ISO 9001 standard measures and recognizes the quality of a company’s products". This statement is: False May be True None of these c The ratio of speed and diameter of the driver and driven pulley is given as
= \(\frac{N_{2}}{N_{1}}\) \(\frac{d_{1} + t}{d_{2} + t}\)
N2 = 1500 rpm, N1 = 900 rpm, d1 = 750 mm,
Now, by the formula we have,
As thickness is not given so neglecting it, we get
\(\frac{1500}{900}=\frac{750}{d_{2}}\)
D2 = 450 mm		 Comments Active
15 An electric motor running at 900 rpm drives a pump at 1500 rpm. If the pulley on the driving shaft is 750mm in diameter, what is the required size of pulley on the driven shaft? 1250 mm 450 mm 900 mm None of these b The ratio of speed and diameter of the driver and driven pulley is given as
= \(\frac{N_{2}}{N_{1}}\) \(\frac{d_{1} + t}{d_{2} + t}\)
N2 = 1500 rpm, N1 = 900 rpm, d1 = 750 mm,
Now, by the formula we have,
As thickness is not given so neglecting it, we get
\(\frac{1500}{900}=\frac{750}{d_{2}}\)
D2 = 450 mm		 Comments Active
16 In the context of factors utilized in FMEA, choose the odd one out. Occurrence Severity Serviceabilityy Detection c Comments Active
17 Water from a large pipe at 4 bar(g) flows out as vertical jet through a small nozzle. The maximum height that the water jet may achieve is _____approximately 45 m 4 m 35 m 40 m d P = 4 bar = 4 × 105 Pa
Now, Pressure of water p = ρgh,
4 × 105 = 1000 × 10 × h 
H = 40 m		 Comments Active
18 ___________is a manufacturing philosophy that emphasizes careful scheduling of work, on-time delivery of zero- PERT MRP EOQ JIT d Comments Active
19 _______is a close running fit used in small electric motor and pump shafts. H11 C11 H7 F7 H9 H9 H8 M7 b Comments Active
20 In ABC classification system of inventory management, A B C Any of these a We know, Absolute Pressure = Vacuum Pressure - Atmospheric pressure
Vacuum pressure = 40 kPa, Atmospheric pressure = 100 kPa Absolute pressure = 100 - 40 = 60 kPa		 Comments Active
21 A vacuum gauge connected to a chamber reads 40 kPa Atmospheric pressure at the location is 100 kPa. Then, the absolute pressure in the chamber is 40 kPa 160 kPa 60 kPa None of these c We know, Absolute Pressure = Vacuum Pressure - Atmospheric pressure
Vacuum pressure = 40 kPa, Atmospheric pressure = 100 kPa Absolute pressure = 100 - 40 = 60 kPa		 Comments Active
22 For a liquid being pumped,
Pressure head at pump inlet + velocity head in suction pipe - vapor pressure head =_________		 Stagnation head Net Positive Suction Head Total energy head Hydraulic head b Comments Active
23 Condition monitoring is the basis for_________ preventive shutdown breakdown predictive d Comments Active
24 An investment of Rs 60,000 in a new equipment is expected to have salvage value of Rs 8,000 after 5 years. What is the straight line depreciation ? Rs 13,600 Rs 10,400 Rs 12,000 None of these b Annual Depreciation (D) in straight line method
D = = = 10400 \(\frac{C(Cost price of equipment) - V(Salvage value)}{n(estimated life of machine in years)}\) \(\frac{60000 - 8000}{5}\)
= Rs10400		 Comments Active
25 Abrupt change of cross section in a member subject to load can result in__. thermal stresses creep stress concentration fatigue c Comments Active
26 Select the correct statements: The Pelton wheel, can be installed either horizontally or vertically
1 can be installed either horizontally or vertically
2 gives optimum efficiency at runaway speed
3 remains submerged in water
4 operates by converting the available energy fully into kinetic energy before entering the rotor		 a and b a and c b and d a and d b Comments Active
27 Operation of hydraulic press is on the basis of___ Joule's law Pascal's law Newton's law Dalton's law b Pascal’s Law is the principle of transmission of fluid-pressure. It says that "a pressure exerted anywhere in a point of the confined fluid is transmitted equally in all directions throughout the fluid”. Comments Active
28 Ship building is an example of________ layout. Job shop Fixed point Line processing Continuous flow b In a fixed-position layout, the product remains at one location & manufacturing equipment is moved to the product rather than vice-versa. Very high weight and bulky product which can not be moved from one place to another place conveniently like Ships, Rockets, Submarine are made with this layout. Comments Active
29 A toy manufacturing factory has annual capacity of 12,000 toys. If the fixed costs are rupees 1 lakh /year, variable cost rupees 20 per unit and the selling price rupees 40 per unit, the quantity to break-even is 5000 300 2500 None of these a Break even point = \(\frac{Total fixed cost (TFC)}{Price per unit (P) - Variable cost (V.C.)}\)
Total fixed cost (TFC) = 100000, P = 40, VC = 20.
Break even point = \(\frac{Total fixed cost (TFC)}{Price per unit (P) - Variable cost (V.C.)}\)
Total fixed cost (TFC) = 100000, P = 40, VC = 20. .
Break even point = = 5000 \(\frac{100000}{40 -20}\)
Hence, the quantity of break-even is 5000 units.		 Comments Active
30 A simple method of detecting surface flaws in welds is Dye penetrant test X-ray inspection Impact test Bend test a Comments Active
31 For a repairable product, the ratio of the time it is working satisfactorily to _______called availability the total down time the test interval  the total up time failure rate b Comments Active
32 A firm wants to install automatic machines to produce 250,000 castings per annum. The operation takes 1.5 minute of machine time and about 2% products are defective. Each machine is available for 2,000 hours of capacity per year. How many machines are required ?  6 5 4 None of these c Total castings per year = 250000, machine time = 1.5 minute, Each Machine available for 2000 hours per year, 2% products are defective
Therefore
Total number of castings required to produce = = 255102 \(\frac{250000}{0.98}\)
Number of castings produced by each machine = = 80000 \(\frac{2000×60 minutes}{1.5 minutes}\)
Therefore Number of machines required = = = 3.188 \(\frac{Total number of products }{Capacity of machine}\) \(\frac{255102}{80000}\)
As number of machines can not be in decimal or fraction therefore considering it to be 4.		 Comments Active
33 Absolute temperature of 77K =____, approximately. -196°C 350°C 77°F None of these a T = 77 K
T (K) = t (°C) + 273.15. 7
77 K = t (°C) + 273.15.
T = - 196°C.		 Comments Active
34 Tachometers are used to measure displacement strain vibration angular velocity d Comments Active
35 Penetration in case of gas metal arc welding is about, 3.5 5 1.25 15 c Comments Active
36 The ability of an acceptance sampling Plan to distinguish between good and bad lots of products is known from it's Trend graph Quality history OC curve None of these c Comments Active
37 A job-design to be time-studied has fatigue and delay allowance of 10 minutes & 25 minutes per 8-hour shift. In addition 25 minutes personal time is permitted in a shift. Then, the total allowance factor necessary to calculate Standard Time for this activity will be___ 1.143 0.8 12.0% None of these a Personal allowance = 25 minutes,
Fatigue allowance = 10 minutes,
Unavoidable delay allowance = 25 minutes,
Standard time = 8 hour (shift)
Total allowance = Personal allowance + Fatigue allowance + Unavoidable delay allowance
Total allowance = 25 + 10 + 25 = 60 minutes = 1 hour
Standard Time = Normal Time   Total Allowance
∴ Normal time = Standard time - Total allowance = 8 - 1 = 7 hour
Allowance factor = = = 1.143 \(\frac{Standard time}{Normal time}\) \(\frac{8}{7}\)		 Comments Active
38 An I. C. Engine develops indicated power of 150 kW. If the mechanical efficiency of the engine is 80%, then brake power delivered is 187.5 kW 120 kW 200 kW 180 kW b Indicated power = 150 kW, Mechanical efficiency = 80%
ɳm = \(\frac{Brake power}{Indicated power}\)
0.8 = = 120 kW \(\frac{Brake power}{150}\)		 Comments Active
39 ______is used for measuring vacuum. LVDT Rota meter Pirani gauge Anemometer c Comments Active
40 The by-pass factor of a cooling coil is 0.2. If the surface temperature is 5°C and air enters at 40°C, the exit temperature of air will be_______ 5°C 12°C 20°C 40°C b The bypass fator of a cooling coil is given by:
BPF = \(\frac{T_{outlet}-T_{coil}}{T_{inlet}-T_{coil}}\)
BPF = 0.2, Tinlet = 40, and Tcoil = 5 \(℃\) \(℃\)
0.2 = \(\frac{T_{outlet} - 5}{40 - 5}\)
Therefore Toutlet = 12 \(℃\)		 Comments Active
41 A key of 14mm width, 9mm height and 100 mm length is mounted on a shaft of 50mm diameter. If allowable shear stress for the key material is 50 MPa, what is the maximum torque that can be transmitted? 3500Nm 4500Nm 2250Nm 1750Nm d B = 14mm, l = 100mm, d = 50mm = 0.05m,
Allowable stress of key = 50 MPa
For rectangular key shear stress is
= = \(Τ\) \(\frac{F}{A}\) \(\frac{F}{B × l}\)
50 MPa \(\frac{F}{B × l}\) \(≤\)
F 50 l \(≤\) \(×b\) \(×\)
F = 50 14 100 = 70000 N = 70 kN \(×\) \(×\)
The torque transmitted by the shaft
T = F d/2 \(×\)
T = 70000 0.025 = 1750 Nm \(×\)
Hence max torque that can be transmitted is 1750		 Comments Active
42 R charts are control charts for_______. variables reliability attributes maintainability a Comments Active
43 A mass of wet steam contains 15% liquid water. Dryness fraction of steam is__ 0.15 1.15 0.85 None of these c Ml = 15, mv = 85.
Dryness fraction (x) = = 0.85 \(\frac{85}{15 + 85}\)
X = 0.85		 Comments Active
44 Increasing carbon content in steel,________ ultimate strength and_______ ductility of steel. increases, decreases decreases, decreases increases, increases decreases, increases a Comments Active
45 Which is not a part of PDCA cycle (Deming wheel)? Do Check Plan Approve d Comments Active
46 In a closed loop process control system with PID controller, ____response depends only on the difference between set point and the process variable. proportional integral differential All of these d Close loop transfer function depends on all type of controller.
E(s) ∝ std (Derivative controller)
E(s) ∝ K (Proportional controller)
E(s) ∝ KI/s (Integral controller)		 Comments Active
47 The refrigerant used in reversed Brayton or Bell-Coleman cycle is air Freon ammonia water a Reversed Brayton cycle used in the air refrigeration cycle which uses air as the refrigerant. Comments Active
48 In Q7 tools for process improvement, the one that graphs pairs of numerical data to look for a relationship is Fishbone chart Check sheet Scatter diagram Histogram c The 7 basic quality tools i.e. Q7 tools are as follows: Flow Chart Histogram Cause-and-Effect Diagram Check Sheet Scatter Diagram Control Charts Pareto Charts Comments Active
49 _________are casting defects caused by improper shrinkage / hindered contraction. Hot tears Swell Shifts Fins a The 7 basic quality tools i.e. Q7 tools are as follows: Flow Chart Histogram Cause-and-Effect Diagram Check Sheet Scatter Diagram Control Charts Pareto Charts Comments Active
50 For same compression ratio & heat supplied, which thermodynamic air cycle has maximum thermal efficiency? Otto cycle Diesel cycle Dual cycle All of these a Comments Active
51 Industrial RTDs for precise measurements are usually made from Silver Platinum Aluminium Steel b Comments Active
52 __________is the tool for organizing the workplace in a clean, efficient and safe manner to enhance productivity and enable standardized working. 5S 3D 6 \(σ\) None of these a 5S is a Japanese methodology for workplace organization. It is a methodology of Total Productive Maintenance (TPM). It stands for Sort, Set, Shine, Standardization and Sustain. 5S is a simple tool for organizing your workplace in a clean, efficient and safe manner to enhance your productivity, visual management and to ensure the introduction of standardized working. Comments Active
53 A cylindrical tank of internal diameter 10m is fabricated from 10mm thick steel plate. What is the maximum tangential stress due to internal pressure of 4kPa? 1MPa 4 MPa 2 MPa 0.5 MPa c P = 4 kPa, d = 10 m = 10 × 103 mm, t = 10 mm.
Tangential or hoop stress:
h = = = 2 KPa = 2MPa \(Σ\) \(\frac{pd}{2t}\) \(\frac{4×10×10^{3}}{2×10}\) \(×\) \(10^{3}\)		 Comments Active
54 A thermometer reads 73.5°C and the correction from calibration curve is -0.35 °C in the measurement range of 70°C to 90°C. What is the true value of the temperature? 73.85°C 73.15°C 70.35°C 90.85 °C b Reading Temperature (l) = 73.5°C,  correction factor = l - 0.35°C.
True Value of temperature = I - 0.35°C.
True Value of temperature = 73.5°C - 0.35°C = 73.15°C.		 Comments Active
55 In a wind turbine,______measures the wind direction and guides the yaw drive to position the rotor to face the wind. Speedometer Wind vane Anemometer None of these b Comments Active
56 1 m3 of a gas at 5 bar pressure is compressed at constant temperature to 0.5 m3. What is the final pressure? 2.5 bar 0.1 bar 10 bar None of these c V1 = 1 m3, P1 = 5 bar, V2 = 0.5 m3
For the isothermal process
P1V1 = P2V2
5 × 1 = P2 × 0.5
P2 = 10 bar		 Comments Active
57 With reference to object size, choose the odd one among the following 2D transformations: Translation Reflection Rotation Scaling d Comments Active
58 For the same cross sectional area (or weight),______shafts have higher strength and rigidity than________ solid, hollow hollow, solid Both are equal None of these b Comments Active
59 A metal flat, 40mm wide 10mm thick section and 2m length, is under axial compressive load of 40 kN. If contraction in length is 1mm and increase in width is 0.006mm, What is the value of Poisson's ratio ? 0.06 0.3 0.1 0.4 b P = 40 kN, L = 1mm, L = 2000mm, w = 0.006mm, w = 40m, t = 10mm \(∆\) \(∆\)
Lateral strain d = = = 0.00015 \(∈\) \(\frac{∆w}{w}\) \(\frac{0.006}{40}\)
Longitudinal strain L = = = 0.0005 \(∈\) \(\frac{∆L}{L}\) \(\frac{1}{2000}\)
Poisson ratio () = \(μ\) \(\frac{Lateral strain}{Longitudinal strain}\)
= = 0.3 \(Μ\) \(\frac{0.00015}{0.0005}\)		 Comments Active
60 A 10 tonne refrigeration system consumes 10kW of electrical energy. It's Coefficient of Performance will be__________ 10 3.5 0.35 35 b A 10-tonne refrigeration system
1 tonne = 3.5 kW hence, 10 tonne = 35 kW
Q1 = 35 kW
Refrigeration system consumes 10 kW of electrical energy.
WR = 10 kW
COP = = = 3.5 \(\frac{Q_{1}}{W_{R}}\) \(\frac{35}{10}\)		 Comments Active