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Mechanical Engineering Objective Questions { Thermodynamics }



463. Which of the following is the unit of energy
A.Joule (J)
B.Watt (W) and Joule/metre2(J/M2)
C.Joule-metre (Jm)
D.J/m
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464. Which of the following is the unit of entropy
A.1/kg °K
B.J/ °K
C.Nm/kg sec
D.Nm/kg °K
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465. Which of the following is the unit of universal gas constant
A.Nm/kg
B.Nm/°K
C.Nm kg/°K
D.Nm/kg mole °K
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466. Pick up the correct statement from the following
A.All the engines have same efficiency
B.All the reversible engines have same efficiency
C.All the reversible engines working between the same temperature limits have same efficiency
D.In order to obtain high efficiency all engines are designed as reversible
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467. It is not possible to liquefy hydrogen at room temperature by application of pressure because
A.Its critical temperature is lower than room temperature
B.It has low density
C.It has three isotopes
D.It has high thermal conductivity
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468. All gases behave ideally under
A.Vacuum conditions
B.Low pressure conditions
C.High pressure conditions
D.High pressure and high temperature conditions
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469. Pick up the correct statement from the following
A.Diesel cycle is more efficient than Otto cycle for a given compression ratio
B.Otto cycle is more efficient than Diesel cycle for a given compression ratio
C.For a given compression ratio, both Otto and Diesel cycles have same efficiency
D.In actual practice Otto cycle is more efficient than Diesel cycle
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