51. Which of the following items is not a path function
(a) heat
(b) work
(c) kinetic energy
(d) vdp
(e) thermal conductivity.
Ans: e
52. Work done in an adiabatic process between a given pair of end states depends on
(a) the end states only
(b) particular adiabatic process
(c) the value of index n
(d) the value of heat transferred
(e) mass of the system.
Ans: a
53. Heat and work are
(a) point functions
(b) system properties
(c) path functions
(d) intensive properties
(e) extensive properties.
Ans: c
54. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure
(a) enthalpy
(b) volume
(c) mass
(d) entropy
(e) specific volume.
Ans: b
55. The value of n = 1 in the poly tropic process indicates it to be
(a) reversible process
(b) isothermal process
(c) adiabatic process
(d) irreversible process
(e) free expansion process.
Ans: b
56. Solids and liquids have
(a) one value of specific heat (ft) two values of specific heat
(c) three values of specific heat
(d) no value of specific heat
(e) one value under some conditions and two values under other conditions.
Ans: a
57. A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
(a) 54°C
(b) 327°C
(c) 108°C
(d) 654°C
(e) 600°C
Ans: b
58. Curve A in Fig. 1.1 compared to curves B and C shows the following type of expansion
(a) pV"=C
(b) isothermal
(c) adiabatic
(d) free expansion
(e) throttling.
Ans: b
59. If value of n is infinitely large in a poly tropic process pV" = C, then the process is known as constant
(a) volume
(b) pressure
(c) temperature
(d) enthalpy
(e) entropy.
Ans: a
60. The index of compression n tends to reach ratio of specific heats y when
(a) flow is uniform and steady
(b) process is isentropic
(c) process is isothermal
(d) process is isentropic and specific heat does not change with temperature
(e) process is isentropic and specific heat changes with temperature.
Ans: d
61. Change in enthalpy of a system is the heat supplied at
(a) constant pressure
(b) constant temperature
(c) constant volume
(d) constant entropy
(e) N.T.P. condition.
Ans: a
62. The term N.T.P. stands for
(a) nominal temperature and pressure
(b) natural temperature and pressure
(c) normal temperature and pressure
(d) normal thermodynamic practice
(e) normal thermodynamic pressure.
Ans: c
63. A heat exchange process in which the product of pressure and volume remains constant is known as
(a) heat exchange process
(b) throttling process
(c) is entropic process
(d) adiabatic process
(e) hyperbolic process.
Ans: e
64. In an isothermal process, the internal energy of gas molecules
(a) increases
(b) decreases
(c) remains constant
(d) may increase/decrease depending on the properties of gas
(e) shows unpredictable behavior.
Ans: c
65. Zeroth law of thermodynamics
(a) deals with conversion of mass and energy
(b) deals with reversibility and irreversibility of process
(c) states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
(d) deals with heat engines
(e) does not exist.
Ans: c
66. If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
(a) 80°C
(b) 0°C
(c) 40°C
(d) 20°C
(e) 60°C.
Ans: b
67. The basis for measuring thermodynamic property of temperature is given by
(a) zeroth law of thermodynamics
(b) first law of thermodynamics
(c) second law of thermodynamics
(d) third law of thermodynamics
(e) Avogadro's hypothesis.
Ans: a
68. One watt is equal to
(a) 1 Nm/s
(b) 1 N/mt
(c) 1 Nm/hr
(d) 1 kNm/hr
(e) 1 kNm/mt.
Ans: a
69. Work done is zero for the following process
(a) constant volume
(b) free expansion
(c) throttling
(d) all Of the above
(e) none of the above.
Ans: d
70. For which of the following substances, the gas laws can be used with minimum error
(a) dry steam
(b) wet steam
(c) saturated steam
(d) superheated steam
(e) steam at atmospheric pressure.
Ans: d
(a) heat
(b) work
(c) kinetic energy
(d) vdp
(e) thermal conductivity.
Ans: e
52. Work done in an adiabatic process between a given pair of end states depends on
(a) the end states only
(b) particular adiabatic process
(c) the value of index n
(d) the value of heat transferred
(e) mass of the system.
Ans: a
53. Heat and work are
(a) point functions
(b) system properties
(c) path functions
(d) intensive properties
(e) extensive properties.
Ans: c
54. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure
(a) enthalpy
(b) volume
(c) mass
(d) entropy
(e) specific volume.
Ans: b
55. The value of n = 1 in the poly tropic process indicates it to be
(a) reversible process
(b) isothermal process
(c) adiabatic process
(d) irreversible process
(e) free expansion process.
Ans: b
56. Solids and liquids have
(a) one value of specific heat (ft) two values of specific heat
(c) three values of specific heat
(d) no value of specific heat
(e) one value under some conditions and two values under other conditions.
Ans: a
57. A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
(a) 54°C
(b) 327°C
(c) 108°C
(d) 654°C
(e) 600°C
Ans: b
58. Curve A in Fig. 1.1 compared to curves B and C shows the following type of expansion
(a) pV"=C
(b) isothermal
(c) adiabatic
(d) free expansion
(e) throttling.
Ans: b
59. If value of n is infinitely large in a poly tropic process pV" = C, then the process is known as constant
(a) volume
(b) pressure
(c) temperature
(d) enthalpy
(e) entropy.
Ans: a
60. The index of compression n tends to reach ratio of specific heats y when
(a) flow is uniform and steady
(b) process is isentropic
(c) process is isothermal
(d) process is isentropic and specific heat does not change with temperature
(e) process is isentropic and specific heat changes with temperature.
Ans: d
61. Change in enthalpy of a system is the heat supplied at
(a) constant pressure
(b) constant temperature
(c) constant volume
(d) constant entropy
(e) N.T.P. condition.
Ans: a
62. The term N.T.P. stands for
(a) nominal temperature and pressure
(b) natural temperature and pressure
(c) normal temperature and pressure
(d) normal thermodynamic practice
(e) normal thermodynamic pressure.
Ans: c
63. A heat exchange process in which the product of pressure and volume remains constant is known as
(a) heat exchange process
(b) throttling process
(c) is entropic process
(d) adiabatic process
(e) hyperbolic process.
Ans: e
64. In an isothermal process, the internal energy of gas molecules
(a) increases
(b) decreases
(c) remains constant
(d) may increase/decrease depending on the properties of gas
(e) shows unpredictable behavior.
Ans: c
65. Zeroth law of thermodynamics
(a) deals with conversion of mass and energy
(b) deals with reversibility and irreversibility of process
(c) states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
(d) deals with heat engines
(e) does not exist.
Ans: c
66. If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
(a) 80°C
(b) 0°C
(c) 40°C
(d) 20°C
(e) 60°C.
Ans: b
67. The basis for measuring thermodynamic property of temperature is given by
(a) zeroth law of thermodynamics
(b) first law of thermodynamics
(c) second law of thermodynamics
(d) third law of thermodynamics
(e) Avogadro's hypothesis.
Ans: a
68. One watt is equal to
(a) 1 Nm/s
(b) 1 N/mt
(c) 1 Nm/hr
(d) 1 kNm/hr
(e) 1 kNm/mt.
Ans: a
69. Work done is zero for the following process
(a) constant volume
(b) free expansion
(c) throttling
(d) all Of the above
(e) none of the above.
Ans: d
70. For which of the following substances, the gas laws can be used with minimum error
(a) dry steam
(b) wet steam
(c) saturated steam
(d) superheated steam
(e) steam at atmospheric pressure.
Ans: d
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