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Mechanical Engineering Objective Questions { Thermodynamics }



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

65. 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

66. One watt is equal to
A.1 Nm/s
B.1 N/mt
C.1 Nm/hr
D.1 KNm/hr

67. Work done is zero for the following process
A.Constant volume
B.Free expansion
C.Throttling
D.All Of the above

68. 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

69. 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

70. On volume basis, air contains following parts of oxygen
A.21
B.23
C.25
D.77

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