Gobierno, compromisos y participación de los grupos de interés

1. All the commercial liquid fuels are derived from natural petroleum (or crude oil).

 A.True

 B. False

Answer: A

2. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

 A.Carnot cycle

 B.Stirling cycle

 C.Otto cycle

 D.Diesel cycle Answer: D

3. The efficiency and work ratio of a simple gas turbine cycle are

 A.low

 B.very low

 C.high

 D.very high Answer: B

4. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

 A.specific heat at constant volume

 B.specific heat at constant pressure

 C.kilo Joule

 D.none of these Answer: A

 C.the change in internal energy is equal to the mechanical workdone

 D.all of the above Answer: D

7. Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.

 A.Correct

 B.Incorrect Answer: B

8. Which of the following represents Otto cycle on temperature – entropy (T – s) diagram?

9. When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.

 A.True

 B.False

Answer: A

10. Which of the following is the lightest and most volatile liquid fuel?

 A.Gasoline

 B.Kerosene

 C.Fuel oil Answer: A

11. The processes occuring in open system which permit the transfer of mass to and from the system, are known as

 A.flow processes

 B.non-flow processes

 C.adiabatic processes

 D.none of these Answer: A

12. Which of the following has the minimum atomic mass?

 A.Oxygen

 B.Sulphur

 C.Nitrogen

 D.Carbon

Answer: D

13. Workdone in a free expansion process is

 A.zero

 B.minimum

 C.maximum

 D.positive Answer: A

14. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

 A.one-half

 B.one-third

 C.two-third

 D.three-fourth Answer: C

15. The compression ratio for petrol engines is

 A.3 to 6

 B.5 to 8

 C.15 to 20

 D.20 to 30 Answer: B

16. The most probable velocity of the gas molecules is given by

Answer: B

17. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

 A. cut-off is increased

 B. cut-off is decreased

 C. cut-off is zero

 D. cut-off is constant Answer: C

18.The entropy __________ in an irreversible cyclic process.

 A. remains constant

 B. decreases

 C. increases Answer: C

19. The atomic mass of oxygen is

 A. 12

 B. 14

 C. 16

 D. 32

Answer: C

20. The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is

 A. equal to one

 B. less than one

 C. greater than one

 D. none of these Answer: C

Thermodynamics MCQ SET-2

21. Carbonisation of coal consists of

 A. drying and crushing the coal to a fine powder

 B. moulding the finely ground coal under pressure with or without a binding material

 C. heating the wood with a limited supply of air to temperature not less than 280°C

 D. none of the above Answer: D

22. The efficiency of Stirling cycle is __________ Carnot cycle.

 A. greater than

 B. less than

 C. equal to Answer: C

23. According to Gay-Lussac law for a perfect gas, p/T = constant, if v is kept constant.

 A. True

 B. False

Answer: A

24. There is no change in internal energy in an isothermal process.

 A. Correct

 B. Incorrect Answer: A

25. If the value of n = 0 in the

equation pvn = C, then the process is called

 A. constant volume process

 B. adiabatic process

 C. constant pressure process

 D. isothermal process Answer: C

26. The value of specific heat at constant pressure (cp) is __________

that of at constant volume (cv).

 A. less than

 B. equal to

 C. more than Answer: C

27. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________

of fuel.

 A. atomisation

 B. carbonisation Answer: B

28. Which of the following is correct?

 A. Absolute pressure = Gauge pressure + Atmospheric pressure

 B. Gauge pressure = Absolute pressure + Atmospheric pressure

 C. Atmospheric pressure = Absolute pressure + Gauge pressure

 D. Absolute pressure = Gauge pressure – Atmospheric pressure

Answer: A

29. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points.

Such a process is called

 A. cracking

 B. carbonisation

 C. fractional distillation

 D. full distillation Answer: C

30. Which of the following statement is incorrect?

 A. The liquid fuels consist of hydrocarbons.

 B. The liquid fuels have higher calorific value than solid fuels.

 C. The solid fuels have higher calorific value than liquid fuels.

 D. A good fuel should have low ignition point.

Answer: C

31. Which of the following gas is mostly used in town for street and domestic lighting and heating?

 A. Producer gas

 B. Coal gas

 C. Mond gas

 D. Coke oven gas Answer: B

32. The value of gas constant (R) in S.

I. units is

 A. 0.287 J/kgK

 B. 2.87 J/kgK

 C. 28.7 J/kgK

 D. 287 J/kgK Answer: D

33. In the first law of thermodynamics, the total energy of the system remains constant.

 A. True

 B. False

Answer: A

34. The efficiency of Diesel cycle increases with

 A. decrease in cut-off

 B. increase in cut-off

 C. constant cut-off

 D. none of these Answer: A

35. Coal gas is obtained by mixing coal and gas at ambient conditions.

 A. Yes

 B. No

Answer: B

36. According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.

 A. equal to

 B. directly proportional to

 C. inversely proportional to Answer: B

37. The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.

 A. Agree

 B. Disagree Answer: A

38. One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

 A. All

 B. 4/7

 C. 11/4

 D. 9/7

Answer: B

39. The absolute zero temperature is taken as

 A. -273°C

 B. 273°C

 C. 237°C

 D. -237°C Answer: A

40. The specific heat of water is

 A. 1.817

 B. 2512

 C. 4.187

 D. none of these Answer: C

Thermodynamics MCQ SET-3

41. The constant pressure, constant volume and constant pvn processes are regarded as irreversible process.

 A. True

 B. False

Answer: A

42. Stirling and Ericsson cycles are

 A. reversible cycles

 B. irreversible cycles

 C. semi-reversible cycles

 D. quasi-static cycles Answer: A

43. When cut-off ratio is __________

the efficiency of Diesel cycle approaches to Otto cycle efficiency.

 A. zero

 B. 1/5

 C. 4/5

 D. 1

Answer: A

44. A series of operations, which takes place in a certain order and

restore the initial conditions at the end, is known as

 A. reversible cycle

 B. irreversible cycle

 C. thermodynamic cycle

 D. none of these Answer: C

45. An isothermal process is governed by

 A. Boyle’s law

 B. Charles’ law

 C. Gay-Lussac law

 D. Avogadro’s law Answer: A

46. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

 A. workdone

 B. entropy

 C. enthalpy

 D. none of these Answer: C

47. The value of 1 mm of Hg is equal to

 A. 1.333 N/m2

 B. 13.33 N/m2

 C. 133.3 N/m2

 D. 1333 N/m2 Answer: C

48. One kg of carbon requires 4/3 kg of oxygen and produces __________

kg of carbon monoxide gas.

 A. 8/3 properties, is governed by

 A. Boyle’s law gas is the product of molecular mass of the gas and the gas constant.

 A. Correct

 A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work

 B. it is possible to construct an engine working on a cyclic process,

whose sole purpose is to convert heat energy into work

 C. it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body

 D. none of the above Answer: A

52. According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant.

 A. directly

 B. indirectly Answer: A

53. According to Avogadro’s law

 A. the product of the gas constant and the molecular mass of an ideal gas is constant

 B. the sum of partial pressure of the mixture of two gases is sum of the two

 C. equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

 D. all of the above Answer: C

54. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

 A. isothermal process

 B. hyperbolic process

 C. adiabatic process

 D. polytropic process Answer: A

55. Which of the following gas has a minimum molecular mass?

 A. Oxygen

 B. Nitrogen

 C. Hydrogen

 D. Methane

Answer: C

56. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it.

This law is known as

 A. law of equipartition of energy

 B. law of conservation of energy

 C. law of degradation of energy

 D. none of these Answer: A

57. The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.

 A. is equal to

 B. is not equal to Answer: B

58. The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the

temperature remains constant. This statement is known as Charles’ law.

 A. Yes

 B. No

Answer: B

59. The fuel mostly used in steam boilers is

 A. brown coal

 B. peat

 C. coking bituminous coal

 D. non-coking bituminous coal Answer: D

60. The efficiency of Joule cycle is

 A. greater than Carnot cycle

 B. less than Carnot cycle

 C. equal to Carnot cycle

 D. none of these Answer: B

Thermodynamics MCQ SET-4

61. The hyperbolic process is governed by

 A. Boyle’s law

 B. Charles’ law

 C. Gay-Lussac law

 D. Avogadro’s law Answer: A

62. A closed system is one in which heat and work crosses the boundary of the system but the mass of the working substance does not crosses the boundary of the system.

 A. Yes

 B. No

Answer: A

63. The entropy of water at 0°C is assumed to be

 A. 1

 B. 0

 C. -1

 D. 10

Answer: B

64. The greater the pressure difference in throttling, the lesser is the irreversibility.

 A. Yes

 B. No

Answer: B

65. During which of the following process does heat rejection takes place in Carnot cycle?

 A. Isothermal expansion

 B. Isentropic expansion

 C. Isothermal compression

 D. Isentropic compression Answer: C

66. Which is the incorrect statement about Carnot cycle?

 A. It is used as the alternate standard of comparison of all heat engines.

 B. All the heat engines are based on Carnot cycle.

 C. It provides concept of maximising work output between the two temperature limits.

 D. all of the above Answer: B

67. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

 A. Zeroth law of thermodynamics

 B. First law of thermodynamics

 C. Second law of

thermodynamics

 D. Kelvin Planck’s law Answer: A

68. The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents

 A. heat absorbed

 B. heat rejected

 C. either (a) or (b)

 D. none of these Answer: C

69. The free expansion process is a constant enthalpy process.

 A. Correct

 B. Incorrect Answer: A

70. The specific heat at constant volume is

 A. the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure

 B. the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

 C. the amount of heat required to raise the temperature of 1 kg of water through one degree

 D. any one of the above Answer: B

71. One kg of carbon produces __________ kg of carbon dioxide.

 A. 3/7

 B. 7/3

 C. 11/3

 D. 3/11

Answer: C

72. Ericsson cycle consists of two constant pressure and two isothermal processes.

 A. Agree

 B. Disagree Answer: A

73. The isothermal and isentropic processes are reversible non-flow processes.

 A. Agree

 B. Disagree

Answer: A

74. The blast furnace gas is a by-product in the by-production of pig iron in the blast furnace.

 A. Yes

 B. No

Answer: A

75. The heat supplied to the gaS at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 – T1 = Rise in temperature, and R = Gas constant)

 A. mR(T2 – T1)

 B. mcv(T2 – T1)

 C. mcp(T2 – T1)

 D. mcp(T2 + T1) Answer: B

76. Liquid fuels have lower efficiency than solid fuels.

 A. True

 B. False

Answer: B

77. The heat absorbed during a polytropic process is

78. Liquid fuels consist of hydrocarbons.

 A. True

 B. False

Answer: A

79. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

80. The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

 A. Agree

 B. Disagree Answer: A

Thermodynamics MCQ SET-5

81. The general gas energy equation is (where Q1 – 2 = Heat supplied, dU = Change in internal energy, and W1 – 2

= Work done in heat units)

Answer: A

82. The compression ratio for Diesel engines is

 A. 3 to 6

 B. 5 to 8

 C. 15 to 20

 D. 20 to 30 Answer: C

83. In an isothermal process,

 A. there is no change in temperature

 B. there is no change in enthalpy

 C. there is no change in internal energy

 D. all of these Answer: D

84. Which of the following is the

correct statement of the second law of thermodynamics?

 A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

 B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

 C. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

 D. all of the above Answer: D

85. The heating and expanding of a gas is called thermodynamic system.

 A. Yes input because in Otto cycle

 A. combustion is at constant

 D. heat rejection is lower Answer: D

87. Liquid fuels have higher calorific value than solid fuels.

 A. Yes

 B. No

Answer: A

88. The free expansion process is __________ non-flow process.

 A. reversible

 B. irreversible Answer: B

89. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The the __________ of two specific heats.

 A. sum B. heaviest Answer: A

92. Otto cycle is also known as

 A. constant pressure cycle

 B. constant volume cycle

 C. constant temperature cycle

 D. constant temperature and

94. Producer gas is obtained by

 A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

 B. carbonisation of bituminous

 A. temperature limits

 B. pressure ratio

 C. compression ratio

 D. cut-off ratio and compression ratio

Answer: D

97. Those substances which have so far not been resolved by any means into other substances of simpler form are called temperature is based on

 A. Zeroth law of thermodynamics

 B. First law of thermodynamics

 C. Second law of

thermodynamics

 D. none of these Answer: A

99. Kelvin-Planck’s law deals with

 A. conservation of work

 B. conservation of heat

 C. conversion of heat into work

 D. conversion of work into heat

Answer: C

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