1. Home
  2. All Previous Year Questions List
S.No Question Option A Option B Option C Option D Answer Solution Comments Status Action
1 The number of instantaneous centres in a slider crank mechanism is : 8 4 6 12 c Comments Active
2 The relation between surface tension ( and the difference of pressure (p) between the inside and outside of a liquid drop of diameter (d) is given by: \(σ)\) \(p=6σ/d\) \(p=4σ/d\) \(p=2σ/d\) \(p=8σ/d\) b Comments Active
3 Continuity equation for compressible fluids is given by: \(A_{1}V_{1}=A_{2}V_{2}\) \(ρ_{1}A_{1}V_{1}=ρ_{2}A_{2}V_{2}\) \(ρ_{1}V_{1}=ρ_{2}V_{2}\) \(ρ_{1}A_{1}V_{1}=ρ_{1}A_{2}V_{1}\) b Comments Active
4 A 1.01325 bar pressure is equivalent to : 0.760 cm of Hg 7.60 cm of Hg 76.0 cm of Hg 760 cm of Hg c Comments Active
5 If water is flowing through a pipe of 5 cm diameter under a pressure of 20 N/cm2 and a mean velocity of 2.0 m/s, the kinetic head will be : 20.4 m 0.101 m 0.204 m 10.1 m c Comments Active
6 If water is heated at , the specific volume: \(0℃\) first decrease and then increases first increases and then decreases decreases gradually remain same a Comments Active
7 Which of the following statements is INCORRECT for assumptions made in derivation of Bernoulli’s equation? The flow is steady The flow is incompressible The viscosity of fluid is non-zero The flow is irrotational c Comments Active
8 Which of the following statements is INCORRECT about fire tube boiler? Load fluctuation cannot be handled These are operated at high pressure up to 250 bars The hot flue gases pass through the tubes and water surround them They are bulky and difficult to transport b Comments Active
9 The volume contained in the cylinder above the top of the piston, when the piston is at the top, is called the: clearance volume total volume piston displacement swept volume a Comments Active
10 Cavitation phenomenon can take place in: Pelton turbine Reciprocating pump Centrifugal pump Tangential flow turbine c Comments Active
11 If the compression ratio is kept the same for Otto cycle and diesel cycle, then which of the following equations is correct? \(η_{otto}≤η_{diesel}\) \( η_{otto}=η_{diesel}\) \(η_{otto}<η_{diesel}\) \(η_{otto}>η_{diesel}\) d Comments Active
12 As per Newton’s law of viscosity , shear stress is directly proportional to ______ velocity viscosity velocity gradient shear strain c Comments Active
13 Cold working of metal forming processes is carried out ______ below the recrystallising temperature above the recrystallising temperature above the melting point below the melting point a Comments Active
14 The degree of reaction for Parson’s reaction turbine is : 70% 90% 50% 30% c Comments Active
15 The mean specific heat (Cps) for superheated steam at 0.5 bar, between 300 and 400, is:(Consider hsup = 3075.5 kJ/kg at 300 and hsup = 3278.9 kJ/kg at 400) \(℃\) \(℃\) \(℃\) \(℃\) \(C_{ps}=1.49\) \(C_{ps}=0.03\) \(C_{ps}=2.03\) \(C_{ps}=0.49\) c Comments Active
16 The flywheel of a steam engine has a radius of gyration of 1 m and mass 2400 kg. The starting torque of the steam engine is 1500 N-m. What will be the angular acceleration of the flywheel? 1.60 rad/s2 0.625 rad/s2 6.25 rad/s2 16.0 rad/s2 b Comments Active
17 Rankine’s formula is valid for _______ long columns short columns short columns as well as long columns moderate columns c Comments Active
18 A cast-iron pipe of 750 mm diameter is used to carry water under pressure of 0.5886 MP(a) What should be the thickness of the pipe if the permissible stress is 20 MPa? 1.104 mm 11.04 mm 1104 mm 110.4 mm b Comments Active
19 If r and are compression ratio and ratio of specific heats respectively, then the air standard efficiency of the Otto cycle is given by: \(γ\) \(η_{otto}=1-\frac{1}{r^{γ}}\) \(η_{otto}=1-\frac{1}{r^{γ}-1}\) \(η_{otto}=1-\frac{1}{r^{γ-1}-1}\) \(η_{otto}=1-\frac{1}{r^{γ-1}}\) d Comments Active
20 If = Tight side tension, = slack side tension and v = linear velocity of belt, then the power transmitted by belt drive is given by: \(T_{1}\) \(T_{2}\) \(P=(T_{1}+T_{2})v\) \(P=(T_{1}×T_{2})v\) \(P=(T_{1}±T_{2})v\) \(P=(T_{1}-T_{2})v\) d Comments Active
21 Hook’s law is obeyed up to the _____ Elastic limit upper yield point proportionality limit breaking point c Comments Active
22 The third law of thermodynamics introduces the principle of increase of entropy throws light on concepts of internal energy establishes a concept of temperature defines the absolute zero of entropy d Comments Active
23 Which of the following is the correct equation for gauge pressure at a point? \(P_{gauge}=P_{absolute}-P_{atmopshere}\) \(P_{gauge}=P_{vacuum}+P_{absolute}\) \(P_{gauge}=P_{absolute}+P_{atmosphere}\) \(P_{gauge}=P_{vacuum}+P_{atmosphere}\) a Comments Active
24 A mechanism has number of links and number of binary joints. The degree of freedom (n) of mechanism according to Grubbler’s criterion will be given by: \(l\) \(j\) \(n=2(l-1)-2j\) \(n=2(l-1)-3j\) \(n=3(l-1)-2j\) \(n=3(l-1)-3j\) c Comments Active
25 A perfect vacuum is obtained when: absolute pressure is zero atmospheric pressure is zero gauge pressure is positive gauge pressure is zero a Comments Active
26 Which of the following statements is a corollary of Carnot’s theorem? The efficiency of all reversible heat engines operating between the same temperature levels is the same The efficiency of all reversible heat engine between the same temperature level is different The efficiency of all irreversible heat engines operating between the same temperature level is the same The efficiency of all irreversible heat engines operating between the same temperature level is different. a Comments Active
27 Which of the following cycle is also known as constant pressure cycle? Carnot cycle Dual cycle Otto cycle Diesel cycle d Comments Active
28 The variation of shear stress developed in a circular shaft subjected to torsion is: hyperbolic linear parabolic uniform b Comments Active
29 _______ enhances the directional solidification of complex casting geometries Runner extension Bottom gate Step gate Chill d Comments Active
30 In 1 kg of wet steam, dry steam is 0.9 kg and water particle is 0.1 kg. What is the dryness fraction? 0.9 1 9 0.1 a Comments Active
31 The functional relation of enthalpy (h) with internal energy (u) and pressure volume product (pv) is given by: u = h + pv h = u – pv u = pv – h h = u + pv d Comments Active
32 The maximum bending moment in a simply supported beam of length carrying a point load (W) at mid span is given by: \((l)\) \(\frac{Wl}{8}\) \(\frac{Wl}{12}\) \(\frac{Wl}{2}\) \(\frac{Wl}{4}\) d Comments Active
33 Which of the following is an accessory of boiler ? Feed pump Blow-off cock Fusible plug Feed check valve a Comments Active
34 What happens on bleeding steam to reheat feed water to boiler? It does not affect the thermal efficiency of the cycle It drops the thermal efficiency of the cycle It improves the thermal efficiency of the cycle It may improve or drop the thermal efficiency of the cycle based on point of extraction of steam. c Comments Active
35 The number of teeth on two meshing gears is 40. The teeth have involute profile and the module is 6 mm. What will be the circular pitch? \(20°\) 18.85 mm 12.00 mm 33.33 mm 66.66 m a Comments Active
36 The ratio of specific heats is always greater than unity, because ______ \(γ=C_{P}/C_{V}\) \(C_{P}=C_{V}+R\) \(C_{V}=C_{P}+C_{P}.R\) \(C_{V}=C_{P}+R\) \(C_{P}=C_{V}-R\) a Comments Active
37 A refrigerating system operates on reversed Carnot cycle. The higher temperature of the refrigerant in the system is 35 and the lower temperature is -15. The COP of the system will be ‘ \(℃\) \(℃\) 0.19 5.16 1.93 0.51 b Comments Active
38 A heat engine receives heat at the rate of 25 kJ/s and gives an output of 8.2 kW. What will be the thermal efficiency of the heat engine? 67.2% 20.4% 30.4% 32.8% d Comments Active
39 The Triple point of is at: \(H_{2}O\) 216.16 K 13.96 K 273.16 K 24.96 K c Comments Active
40 In case of a reciprocating compressor, the clearance ratio is: Swept volume of cylinder / Total volume of cylinder Swept volume of cylinder/ Clearance volume Clearance Volume/Swept Volume of cylinder Clearance volume/Total volume of cylinder c Comments Active
41 Poisson’s ratio ( is given by: \(ν)\) Shear strain/Axial strain Axial strain/ Shear strain Transverse strain/Axial strain Axial strain/Transverse strain c Comments Active
42 Which of the following is NOT a characteristics of entropy? It remains unchanged in all adiabatic frictionless processes It changes in all adiabatic frictionless processes It increases when heat is supplied irrespective of whether temperature changes or not . It decreases when heat is removed irrespective of whether temperature changes or not. b Comments Active
43 Which of the following is NOT common for petrol and diesel engines? Spark plugs Flywheel Gudgeon pin Piston rings a Comments Active
44 Which of the following temperature measuring devices is suitable for measuring temperatures ranging from to ? \(900℃\) \(4000℃\) Bimetallic thermometer Thermocouple thermometer Optical Pyrometer Resistance thermometer c Comments Active
45 An isenthalpic process is a process during which ______ remains constant. temperature entropy enthalpy pressure c Comments Active
46 The Reynold number for laminar flow should be: greater than 6000 lesser than 2000 greater than 4000 lesser than 1000 b Comments Active
47 The discharge (Q) through an orifice meter is given by:(Where and are the area of the pipe and orifice, is the coefficient of discharge and h is the difference of pressure head in the orifice meter) \(a_{1}\) \(a_{2}\) \(C_{d}\) \(Q=C_{d}\frac{a_{1}-a_{2}}{a12-a22}2gh\) \(Q=C_{d}\frac{a_{1}/a_{2}}{a12-a22}2gh\) \(Q=C_{d}\frac{a_{1}+a_{2}}{a12-a22}2gh\) \(Q=C_{d}\frac{a_{1}a_{2}}{a12-a22}2gh\) d Comments Active
48 Which of the following is defined as the gas constant of a gas? The reciprocal of the ratio of the universal gas constant to the molecular weight of the gas. The product of the universal gas constant and the molecular weight of the gas. The reciprocal of the product of the universal gas constant and the molecular weight of the gas The ratio of the universal gas constant to the molecular weight of the gas. d Comments Active
49 The kinematic viscosity of a liquid is 6 stokes. What will the kinematic viscosity in ? \(m^{2}/s\) \(6×10^{-2} m^{2}/s\) \(6×10^{-4}m^{2}/s\) \(6×10^{-3}m^{2}/s\) \(6×10^{2} m^{2}/s\) b Comments Active