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GATE 2019: Thermodynamics Quiz 7

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Question 1

one ton of refrigerator is equal to the refrigeration effect corresponding to melting of 1000 kg of ice:

Question 2

Which of the following statement is not true for the reversed carnot cycle

Question 3

Which of the following is true for Refrigerants

Question 4

In a vapour absorption refrigeration system the refrigeration temperature is –15 °C. The generator is operated by solar heat where the temperature reached is 110 °C. The temperature of surrounding where heat rejected is 55 °C. The maximum COP of the system is _________.

Question 5

The performance test of an air conditioning unit is rated as 40 TR seems to be indicating poor cooling. The test on heat rejection to atmosphere in its condenser shows the following:

Condenser inlet water temperature = 30 °C
Condenser outlet water temperature = 40 °C
Cooling water flow rate = 4L/s
Work input to the compressor = 45.6 kW
Actual refrigerating capacity of the unit is _____________ TR.

Question 6

Saturated liquid R - 134a at 55 °C is throttled in an expansion valve such that the temperature of the two phase liquid-vapour mixture at the exit of the valve is 0 °C. The exit of the valve has 60% liquid by mass. The specific enthalpy of saturated liquid R - 134a at 0 °C and 55 °C are 51.86 kJ/kg and 131.3 kJ/kg, while the specific entropy of saturated liquid at 0 °C and 55 °C are 0.2044 kJ/kg-K and 0.4654 kJ/kg-K respectively. The specific entropy of the mixture at the exit of the valve is

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ESE & GATE ME Thermodynamics

Apr 28ESE & GATE ME