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GATE ME 2020: Thermodynamics Rapid Quiz 3 (App update required to attempt this test)

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Question 1

In a cascade refrigeration cycle two refrigerator is working in series with COP 5 and 3. If this refrigerator is running by a Carnot engine having temperature limit 600K and 300K. and heat supplied to the Carnot engine is 2 kW, then find the refrigeration effect (kW)

Question 2

A 1 ton refrigeration capacity water cooler cools water steadily from 35 °C to 20 °C. The specific heat of water is 4.18kJ/kg. What is water flow rate in litre/hr?

Question 3

A simple ideal Rankine cycle is having fixed boiler and condenser pressure. If the cycle is modified with reheating,

Question 4

Estimate the thermal efficiency & the rate of heat rejection for a heat engine receives heat at the rate of 1450 kJ/min and gives an output of 7.9 kW.

Question 5

Description: Description: 02_Thermodynamics_BLok_files\image030.png
A piston cyclinder arrangement as shown above, contains air at 250 kPa, 3000C. The 50 kg piston has a diameter of 0.1 m and initially pushes against stops. The atmospheric pressure is 100 kPa and temperature is 200C.The cyclinder cools as heat is transferred to the ambient.At what temperature (in 0C) does the piston begin to move down?

Question 6

Air enters the compressor of a gas turbine plant operating on a Brayton cycle at 1 bar, 27 degree Celsius. The pressure ratio in cycle is 6 if  where,  are turbine and compressor works respectively. Calculate the values of
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Feb 16ESE & GATE ME