1. Which of the following cycle is less efficient as compared to the remaining?
Correct : E. Otto cycle
2. The number of degrees of freedom in case of triatomic gases is
Correct : C. 6
3. At critical point the enthalpy of vaporisation is
Correct : B. Zero
4. In which of the following case the process of sublimation can occur?
Correct : B. Solid carbondioxide
5. Work done in a free expansion process is
Correct : D. Zero
6. If a system neither exchange mass nor energy with the surroundings, it is known as
Correct : B. Isolated system
7. Food can be cooked quicker in a pressure cooker because
Correct : C. Steam remains within the cooker
8. A surface which diffusely reflects and emits tha same amount of energy which it receives by radiation, is known as
Correct : D. A perfect radiating surface
9. Exhaust gases from a engine possess
Correct : E. Kinetic energy
10. Which one of the following is an indirect reaction device?
Correct : D. Propeller
11. Cetane number of a diesel fuel is a measure of its
Correct : E. ignition quality
12. A thermistor is a
Correct : D. Miniature resistance
13. Which of the following is a reversible process?
Correct : A. Extension and compression of a spring
14. Power required for the engine is
Correct : C. 9.23 kW
15. According to Charle's law
Correct : A. At constant pressure the volume of a gas is proportional to its temperature
16. The mean free path of a gas least depends on
Correct : A. volume of gas
17. The value of universal gas constant in S.I. units is
Correct : B. 8314 J/kg mole/?k
18. Which of the following valve is installed between the boiler and the feed pump?
Correct : E. Feed check valve
19. Thermodynamic equilibrium is completely defined by the specifications of
Correct : D. All the above together
20. A gas (inversion temperature Ti) undergoing Joule Thomson expansion at temperature T will produce cooling effect only when
Correct : B. Ti > T
21. During an adiabatic expansion, the increase in volume is associated with
Correct : C. Decrease in pressure and decrease in temperature
22. The mean free path of a gas molecule increases with
Correct : C. increase in temperature
23. In a Carnot cycle the heat is rejected at
Correct : B. Constant temperature
24. Which of the following statement is incorrect?
Correct : D. Latent heat per kg of steam decreases as the pressure of steam increases
25. Non-dimensional numbers generally involved in case of heat transfer from horizontal cylinders by natural convection are
Correct : E. (B), (C) and (D) above
26. Which of the following is the best fuel for diesel engines?
Correct : E. Paraffins
27. Air leaking from a punctured tube is an example of
Correct : A. Throttling
28. The percentage of carbondioxide in the exhaust gases from a diesel engine cannot exceed
Correct : C. 29%
29. Internal energy of a perfect gas depends on
Correct : E. Temperature only
30. The process during which external work done is not zero, is
Correct : B. Constant pressure process
31. Which of the following cycle consists of two isothermal and constant volume processes?
Correct : E. Ericsson cycle
32. A perfect black body is
Correct : A. One which absorbs all radiant energy at all wavelengths
33. The characteristics of a control volume are
Correct : D. The volume, shape and position with respect to an observer are fixed
34. By doubling the temperature the radiant heat will increase
Correct : A. 16 times
35. Which of the following is not a property of the system
Correct : D. Heat
36. The mixture formation in a carburettor is based on the principle of
Correct : A. Venturi principle
37. Heating wet steam at constant temperature is same as heating at
Correct : A. Constant pressure
38. A liquid flowing through a tube is turbulent. In which case will the maximum change in heat transfer coefficient occur?
Correct : A. Diameter of the tube is increased 4 time maintaining the ratio of liquid flow constant
39. All of the following cycles consists of two isothermal processes EXCEPT
Correct : C. Brayton cycle
40. Which of the following introduces irreversibility in the actual Carnot engine operation?
Correct : B. Losses from working fluid in transit
41. Which of the following is the best fuel for S.I. engines?
Correct : C. Aromatics
42. The cycle generally used for gas turbines is
Correct : A. Brayton cycle
43. The slope of constant pressure line on temperature entropy diagrm is given by
Correct : B. T/Cp
44. In automobiles clutch is mounted between
Correct : E. Flywheel and gear box
45. During an adiabatic process the change in entropy is
Correct : B. Zero
46. The behaviour of which of the following vapour is closer to that of a gas?
Correct : D. Superheated vapour
47. The ratio of the rise in temperature of a gas when compressed adiabatically to that when compressed isothermally to the same extent is
Correct : E. More than 1
48. In all irreversible processes, the entropy of the system
Correct : A. Increases
49. Which of the following remains constant during an adiabatic process?
Correct : C. entropy
50. Reduced pressure is
Correct : A. dimensionless
51. In the polytropic process equation pvn = constant, if the value of n is infinitely large the process is termed as
Correct : B. Constant volume
52. The ratio of the rise in temperature of a gas when compressed adiabatically to that when compressed isothermally to the same extent is
Correct : A. More than 1
53. Other factors remaining constant, if the temperature of sink is increased, the efficiency of the Carnot engine will
Correct : E. decrease
54. One of the most efficient engines ever developed operates between 2100 k and 700 k. Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this?
Correct : C. 60%
55. For any reversible process, the change in entropy of the system and surroundings is
Correct : B. Zero
56. If all the variables of a steam are in-dependent of time it is said to be in
Correct : C. Steady flow
57. Entropy of mixing is always
Correct : A. positive
58. A system comprising a single phase is called a
Correct : D. Homogeneous system
59. An open system
Correct : D. Has a mass transfer across its boundaries, and the mass within the system is not necessarily constant
60. In the regenerative cycle
Correct : E. Part of the steam is withdrawn from the turbine and is used in heating the feed water
61. Which of the following is a path function quantity?
Correct : A. Work done
62. An ordinary mercury thermometer can be used for temperatures about
Correct : C. 300?C
63. Triple point
Correct : D. Is that point where three phases solid, liquid and gas exist together
64. The characteristics of a control volume are
Correct : E. There is material flow across the boundary
65. The gas turbine works on
Correct : B. Brayton cycle
66. All of the following are intensive properties EXCEPT
Correct : B. Mass
67. A body of weight 100 N falls freely through a distance of 10 m against an atmospheric drag force of 5 N. Considering the body as the system, the work interaction is
Correct : D. 50 Nm
68. In a steam turbine when steam expands, the entropy
Correct : B. Does not change
69. Of the following first law statements, choose the one that is wrong
Correct : C. the heat transfer cannot exceed the work done
70. If the dryness fraction of a sample by throttling calorimeter is 0.8 and that by separating calorimeter is also 0.8, then the actual dryness fraction of sample will be taken as
Correct : E. 0.64
71. Work done by an expanding gas under adiabatic condition results in
Correct : A. Temperature decrease
72. Carburetted water gas is obtained by
Correct : E. Passing alternately steam and air through while hot carbon
73. A process which does not dissipate available energy is known as
Correct : D. Ideal process
74. The weight of 1 cu-m of carbon dioxide at NTP if the characteristic gas constant is 19.28 kg metre/kg/?C, would be
Correct : C. 1.962 kg
75. The ability of gasoline to resist detonation during combustion is given by
Correct : E. Octane number
76. "The internal energy of a gas is a function of temperature". Which of the following name is associated with the above law?
Correct : E. Joule
77. The solubility of a gas in a liquid at small concentration is represented by
Correct : C. Henry's law
78. A scavenging pump is used in
Correct : C. two stroke spark ignition engines
79. The difference between two specific heats of a gas is equal to universal constant when
Correct : B. 1 gm molecule of gas is heated
80. Which of the following is a non-petroleum fuel?
Correct : D. Alcohol
81. The average pressure on the walls of a vessel will be doubled if the
Correct : B. the number of molecules in the vessel is doubled
82. The fastest moving gas molecules are those of
Correct : C. Hydrogen
83. which of the following set of quantities contains intensive variables?
Correct : E. Pressure, temperature and density
84. A system
Correct : A. Is a specified region, not necessarily of constant volume, where transfer of energy and/or mass are to be studied
85. Transformer oil having kinematic viscosity of 3.66 x 10-6 m2/s flows through a tube 8 mm diameter at velocity of 0.6 m/s. The value of Reynolds number of flow would be
Correct : E. 1310
86. An isentropic process is always
Correct : D. Reversible and adiabatic
87. In a reversible polytropic process
Correct : A. The entropy remains constant
88. A gas which obeys kinetic theory perfectly is known as
Correct : B. Perfect gas
89. An automobile heats up while lying in a parking 10 ton a sunny day. The process can be assumed to be
Correct : C. isobaric
90. The efficiency of a Carnot engine is given as 0.75. If the cycle direction is reversed, what will be the value of COP of reversed Carnot cycle
Correct : A. 0.33
91. Which rays have the least wavelength?
Correct : D. Cosmic rays
92. The difference between two specific heats of a gas is equal to universal gas constant
Correct : C. When 1 gm molecule heated
93. 1 cu-m of steam having dryness franction 0.85 at 12 ata mixes with 1.5 kg of water at 12?C at constant pressure. The dryness fraction of resulting steam would be
Correct : D. 0.637
94. In centrifugal compressors, the ratio of outlet whirl velocity to blade velocity at outlet is known as
Correct : B. Slip factor
95. In case of centrifugal compressors the phenomenon of unsteady, periodic and reversed flow is known as
Correct : A. Surging
96. A Rankine cycle working with saturated steam differs thermodynamically from a Carnot cycle only in the fact that
Correct : D. Heat is supplied to the water at temperatures below the maximum temperature of the cycle
97. In case of ideal triatomic gas, the ratio of specific heats Cp/Cv would be
Correct : B. 1.33
98. During adiabatic expansion which of the following remains constant