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SSC-JE ME || Thermodynamics Quiz 4

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Question 1

According to second law of thermodynamics, the entropy change of the system for any process can be

Question 2

Assigning the basic dimensions to mass, length time and temperature respectively as M, L, T and θ (Temperature) what are the dimensions of entropy?

Question 3

For an ideal gas, the slope of the constant volume line in the T-S diagram is.

Question 4

A 75 ohm resistor carrying a constant current of 1 A is kept at a constant temperature of 27 °C by a stream of cooling water. In a time interval of 1s. What is the change in entropy of the universe?

Question 5

Entropy is a measure of ___________.

Question 6

A cyclic device operates between three thermal reservoirs, as shown in the figure. Interactions between the cyclic device and the respective thermal reservoirs are shown in the figure and all are in the form of heat transfer. The cyclic device can be _____.

Question 7

Saturated liquid water is slowly heated at a constant pressure pf 200 kPa to a final state where its quality reaches 0.65. For water at 200 kPa:

T_sat = 120.23˚C, h_f = 504.68 kJ/kg, h_g = 2706.60 kJ/kg.

The change in specific entropy in kJ/kg.K is_____?

Question 8

Air is flowing steadily through a thermally insulated duct. The pressure and temperature of the air measured at two different stations are as follows:

Considering air as an ideal gas, the direction of flow of air in the duct is ____.

Question 9

A reversible heat engine receives 2 kJ of heat from a reservoir at 1000 K and a certain amount of heat from a reservoir at 800 K. It rejects 1 kJ of heat to a reservoir at 400 K. The net work output (in kJ) of the cycle is

Question 10

Nitrogen gas of 0.05m³volume is contained in a piston cylinder device having initial temperature and pressure of 1bar and 25 ºC. The gas is compressed isothermally and reversibly until the pressure is 5bar. Calculate change in entropy for the process.

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