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GATE 2022 ME: Thermodynamics Quiz-3

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Question 1

A reversible heat engine works between two thermal reservoir having source temperature 777°C & sink temp. 27°C. If the heat supplied to engine 70 kW. Calculate the work done by the engine ___________.

Question 2

Two heat engines are connected in series in such a way that rejected heat of 1st engine is directly fed to 2nd engine. If the source temperature is 1600 K and sink temperature is 400 K. Then calculate intermediate temperature If both the engine have same efficiency.

Question 3

A reversible heat engine is operated between two thermal reservoir having source and sink temperature 227°C and 27ׄ°C respectively and produced work. If this work is supplied to a reversible device which is used to maintain a space higher than the environment temperature. If heat supplied to heat engine is 10 kJ and heat extracted from low temperature reservoir is 8 kJ: Then the temperature of the devised maintained space in (ºC) __________.

Question 4

The heat transfer rate in the condenser of a refrigerator (in kJ/h) which has a refrigeration capacity of 12000 kJ/h when power input is 0.75 kW is _________ kJ/hr.

Question 5

The operating temperature of a refrigeration plant is –2ºC. Heat leaks from the surrounding at the rate of 40 kW for an ambient temperature of 50 ºC. The second law efficiency of the refrigerator is 25%. The power required to drive the plant is ________ kW.

Question 6

A solar collector having an area of 80 m2 receives solar radiation and transforms it to the internal energy of fluid at an overall efficiency (η) of 50%. Now this high energy fluid is supplied to a heat engine having an efficiency of 40%. If the heat rejected to sink is 30kW. Then power developed by the engine (in kW) and irradiation to solar collector (in kw/m2) respectively are __________.
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