GATE ME topic:thermodynamics PYQs & Answers — Page 6

Questions 51–58 of 58. Imported answers require independent review unless marked reviewed.

A tank of volume 0.05 m

contains a mixture of saturated water and saturated steam at 200°C. The mass of the liquid present is 8 kg. The entropy (in kJ/kg K) of the mixture is __________ (correct to two decimal places).

Property data for saturated steam and water are: At 200°C,

MPa

/kg,

/kg

kJ/kg K,

kJ/kg K

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Steam flows through a nozzle at a mass flow rate of ṁ = 0.1 kg/s with a heat loss of 5 kW. The enthalpies at inlet and exit are 2500 kJ/kg and 2350 kJ/kg, respectively. Assume negligible velocity at inlet (C

≈ 0), the velocity (C

) of steam (in m/s) at the nozzle exit is ________ (correct to two decimal places).

Diagram for Mechanical Engineering question 45

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The molar specific heat at constant volume of an ideal gas is equal to 2.5 times the universal gas constant (8.314 J/mol·K). When the temperature increases by 100 K, the change in molar specific enthalpy is __________ J/mol.

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A mass

of a perfect gas at pressure

and volume

undergoes an isothermal process. The final pressure is

and volume is

. The work done on the system is considered positive. If

is the gas constant and

is the temperature, then the work done in the process is

Your answerChoose one option.

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One kg of an ideal gas (gas constant,

J/kg. K ; specific heat at constant volume,

J/kg. K) at 1 bar, and 300 K is contained in a sealed rigid cylinder. During an adiabatic process, 100 kJ of work is done on the system by a stirrer. The increase in entropy of the system is ______ J/K.

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A calorically perfect gas (specific heat at constant pressure 1000 J/kg·K) enters and leaves a gas turbine with the same velocity. The temperatures of the gas at turbine entry and exit are 110 K and 400 K, respectively. The power produced is 4.6 MW and heat escapes at the rate of 300 kJ/s through the turbine casing. The mass flow rate of the gas (in kg/s) through the turbine is

Your answerChoose one option.

6.14

7.00

7.50

8.00

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One kg of an ideal gas (gas constant

J/kg·K) undergoes an irreversible process from state-1 (1 bar, 300 K) to state-2 (2 bar, 300 K). The change in specific entropy (

) of the gas (in J/kg·K) in the process is ____________.

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The volume and temperature of air (assumed to be an ideal gas) in a closed vessel is 2.87 m

and 300 K, respectively. The gauge pressure indicated by a manometer fitted to the wall of the vessel is 0.5 bar. If the gas constant of air is

J/kg·K and the atmospheric pressure is 1 bar, the mass of air (in kg) in the vessel is

Your answerChoose one option.

1.67

3.33

5.00

6.66

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GATE ME topic:thermodynamics PYQs

Question 44

Question 45

Question 11

Question 14

Question 33

Question 43

Question 44

Question 45