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GATE 2019: Thermodynamics Quiz 5 (App update required to attempt this test)

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Question 1

5 kg of water at 27 °C is mixed with 10 kg of water at 97 °C in a steady flow process. If room temperature is 27 °C then the unavailable energy with respect to the water at 27 °C is

Question 2

A house that is losing heat at a rate of 60,000 kJ/hr when the outside temperature drops to 4 °C, is to be heated by electric resistance heaters. If the house is to be maintained at 24 °C at all times, then the irreversibility (in kW) of this process is

Question 3

Air enters a compressor in steady flow manner at 140 KPa and 17 °C and leaves it at 350 KPa and 127 °C. During the flow change in enthalpy and kinetic energy are 110.55 kJ/kg and 3.6 kJ/kg respectively. The minimum reversible work input required is ________ kJ/kg.
[Given: Environment temperature is 7 °C]

Question 4

Air enters a compressor in a steady flow manner at 140 KPa and 17 °C and leaves it at 350 KPa and 127 °C. During the flow change in enthalpy and kinetic energy are 110.55 kJ/kg and 3.6 kJ/kg respectively. The minimum reversible work input required is ________ kJ/kg.
[Given: Environment temperature is 7 °C], R=0.28 kJ/kg·K

Question 5

Two identical metal blocks L and M (specific heat = 0.4 kJ/kg.K), each having a mass of 5 kg, are initially at 313 K. A reversible refrigerator extracts heat from block L and rejects heat to block M until the temperature of block L reaches 293 K. The final temperature (in K) of block M is _______

Question 6

Given below is an extract from steam tables.

Specific enthalpy of water in kJ/kg at 150 bar and 45 °C is
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