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ISRO Mechanical Exam: Thermodynamics Quiz
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Question 1
A positive value of Joule-Thomson coefficient of a fluid means
Question 2
A room contains 60kg of air at 100 kPa and 15o C. The room has a 250 W refrigerator (the refrigerator consumes 250 W of electricity when running), a 120 W TV, a KW electric resistance heater, and a 50- W fan. During a cold winter day, it is observed that the refrigerator, the TV, the fan and the electric resistance heater are running continuously but the air temperature in the room remains constant. The rate of heat loss from the room that day is
Question 3
As shown in Fig. below, an ideal gas is confined to a cylinder by a piston. The piston is pushed down slowly so that the gas temperature remains at 27 °C. During the compression, 900 j of work is done on the gas. Find the entropy change of the gas.
Question 4
The efficiency 
of any heat engine and efficiency
R of a reversible heat engine operating between common heat source and heat sink are related as
of any heat engine and efficiencyR of a reversible heat engine operating between common heat source and heat sink are related as Question 5
A steam thermal power plant works on
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