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GATE 2020: Thermodynamics Quiz 4 (App update required to attempt this test)

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Question 1

As shown in Fig. below, an ideal gas is confined to a cylinder by a piston. The piston is pushed down slowly so that the gas temperature remains at 27 °C. During the compression, 900 j of work is done on the gas. Find the entropy change of the gas.

Question 2

1600 kJ of energy is transferred from a heat reservoir at 800 K to another heat reservoir at 400 K. The amount of entropy generated during the process would be (in kJ/K) __________.

Question 3

A reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 and 37 kJ from another heat source at 97 . The heat rejected (in kJ) to the heat sink at 47 is _________.

Question 4

A heat engine operates between three thermal reservoirs. It absorbs 258 kJ of energy as heat from a reservoir at 52 °C and rejects 100 kJ and 88 kJ of energy as heat to reservoirs at 27 °C and 2 °C, respectively. It delivers 70 kJ of work. This heat engine,

Question 5

What will be the entropy of the gas at 35 bar and 850 K temperature? For the given following relations are cp = (0.80 + 0.00030 T) kg/kg K, and cv = (0.60 + 0.00030 T) kJ/kg K.
The specific heats of a gas vary linearly with absolute temperature according the given relations
If the entropy of the gas at 1 bar pressure and 273 K is zero,

Question 6

1 kg of air is heated from 305 to 595 K while pressure drops from 410 to 315 kPa. What will be the change in entropy? Assume: Constant specific heat, Variable specific heat.
Take: Cp0 = 1.004 kJ/kg K; s = 6.8705 kJ/kg K; s = 7.5802 kJ/kg K; R = 0.287
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