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GATE ME 2020: Thermodynamics Rapid Quiz 1 (App update required to attempt this test)
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Question 1
A domestic refrigerator set at 2 °C handles on an average a thermal load of 8000kJ/day. The ambient temperature is 30 °C. The COP of refrigerator is 0.15 times that of Carnot refrigerator. The daily electric consumption (in kWhr) is
Question 2
A Bell Coleman refrigeration cycle works between pressure limits of 1 bar and 5 bar. The adiabatic efficiency of compression is 85% and expansion is 90%. Find out the tonnage capacity _________, when the air flow rate is 1 kg/sec. The ambient temperature is 27ºC and the refrigerator temperature is 0 ºC.
Question 3
In a single heater regenerative cycle, steam enters the turbine at 30 bar 300 °C and condenser pressure is 0.1 bar. The feed water heater is direct contact type which operates at 5 bar. Calculate the steam extracted from turbine to heater (in kg/kg of steam flow) in the cycle. The enthalpies of steam at different locations of the cycle are given in the table below. Pump work may be neglected.
Question 4
What will be the temperature (oC) corresponding to the thermometric property of 3.5 on Celsius scale. If at the ice point and steam point the thermometric properties are found to be 2.5 and 8.5 respectively.
A temperature scale of certain thermometer is given by the relation:
t = a ln p + b
Where a and b are constants and p is the thermometric property of the fluid in the thermometer.
A temperature scale of certain thermometer is given by the relation:
t = a ln p + b
Where a and b are constants and p is the thermometric property of the fluid in the thermometer.
Question 5
A piston cylinder device contains 1 kg of fluid at 40 atm and initial volume 0.04 m3. The fluid is allowed to expand reversibly following the process pv1.45=constant ,so that volume becomes double. The fluid is then cooled at constant pressure until the piston comes back to original position. Keeping this piston unaltered,the heat is added reversibly to restore it to the initial pressure.The total work done (in kJ) in the cycle is ____.
Question 6
Two rigid tanks, each filled with 50 kg of air, have temperature of 900 K and 400 K. A heat engine placed between the two tanks extracts heat from the high temperature tank, produces work, and rejects heat to the low temperature tank. Maximum work obtained from the tank is ________ kJ.
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Apr 8ESE & GATE ME
