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GATE 2019: Thermodynamics Quiz 3
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Question 1
Three kg of oxygen gas is heated from 15oC to 90oC. , the change in enthalpy( in KJ) is
Question 2
A thermocouple with test junction at t °C on gas thermometer scale and reference junction at ice point gives the e.m.f. as e = 0.30 t–5 × 10–4 t2 mV.
The millivoltmeter is calibrated at ice and steam points. What will be the reading on this thermometer where the gas thermometer reads 75 °C?
Question 3
5 kg of gas is compressed in a device from a volume of 1.9m3 to a volume of 1.4m3. During this time, the pressure remains constant at 200 kN/m2, and it is found that internal energy decreases by 12 kJ. How much energy was transferred as heat (in kJ) to the gas in this process.
Question 4
A 1200 kg vehicle travelling at 90 km/hr impacts a plunger attached to a piston-cylinder arrangement. If all of the energy of the vehicle is absorbed by the 100 kg of liquid contained in the cylinder. The maximum temperature rise of the liquid is ________ °C. The specific heat of the liquid is 4.0 kJ/kg °C.
Question 5
In a new temperature scale °X, the boiling and freezing point of water at one atmosphere are 200 °X and 100 °X respectively, is corrected with centigrade scale. The reading 0 °X on the centigrade scale (in °C) is
Question 6
A system is taken from state 1 to state 2 along the path 1-a-2.During this process, 200kJ of heat is added to the system and 50KJ of work was done by the system. If the system is restored to state 1 from state 2 by an adiabatic path 2-b-1 as shown above, then the work done by the system is__________kJ.
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