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Multiple Choice Quiz
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1
A heat engine has a thermal efficiency of 45%. How much power does the engine produce when heat is transferred into it at a rate of 109 kJ/Hr?
A)50 MW
B)75 MW
C)100 MW
D)125 MW
2
A refrigerator has a coefficient of performance of 1.6. How much work must be supplied to this refrigerator for it to reject 1000 kJ of heat?
A)385 kJ
B)627 kJ
C)836 kJ
D)1000 kJ
3
The thermodynamic efficiency of a heat engine that rejects heat at a rate of 20 MW when heat is supplied to it at a rate of 60 MW is:
A)33.3%
B)50%
C)66.7%
D)75%
4
A Carnot engine operates using a 527°C energy reservoir and a 27°C energy reservoir. The thermodynamic efficiency of this engine is:
A)50%
B)62.5%
C)73.6%
D)103%
5
A Carnot heat pump uses thermal reservoirs at -27°C and 57°C. How much power does this pump consume to produce a 100 kW heating effect?
A)9.1 kW
B)12.7 kW
C)15.3 kW
D)20.7 kW
6
An inventor claims to have created a heat engine which produces 10 kW of power for a 15 kW heat input while operating between energy reservoirs at 27°C and 427°C. Is this claim valid?
A)Yes
B)No
7
A manufacturer claims that its refrigerator has a COP of 1.4 when cooling food at 7°C using ambient air at 23°C as a heat sink. Is this claim valid
A)Yes
B)No
8
A heat engine whose thermodynamic efficiency is greater then that of a Carnot device using the same energy reservoir is known as:
A)A perpetual machine of the zeroth kind
B)A perpetual machine of the first kind
C)A perpetual machine of the second kind
D)A perpetual machine of the third kind
9
According to Clausius, heat will transfer naturally from cold bodies to hot bodies
A)Yes
B)No
10
Which of the reversible processes listed below are used to form a Carnot cycle?
A)Isometric, isobaric
B)Isometric, adiabatic
C)Isobaric, adiabatic
D)Isothermal, adiabatic





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