GATE ME 2018 Paper 2 — page 18

Questions 52–54 of 65. Imported answers require review unless explicitly marked reviewed.

Air is held inside a non-insulated cylinder using a piston (mass

kg and area

) and stoppers (of negligible area), as shown in the figure. The initial pressure

and temperature

of air inside the cylinder are 200 kPa and 400°C, respectively. The ambient pressure

and temperature

are 100 kPa and 27°C, respectively. The temperature of the air inside the cylinder (°C) at which the piston will begin to move is ________ (correct to two decimal places).

Diagram for Mechanical Engineering question 42

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A standard vapor compression refrigeration cycle operating with a condensing temperature of 35°C and an evaporating temperature of −10°C develops 15 kW of cooling. The p-h diagram shows the enthalpies at various states. If the isentropic efficiency of the compressor is 0.75, the magnitude of compressor power (in kW) is ________ (correct to two decimal places).

Diagram for Mechanical Engineering question 43

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Ambient air is at a pressure of 100 kPa, dry bulb temperature of 30°C and 60% relative humidity. The saturation pressure of water at 30°C is 4.24 kPa. The specific humidity of air (in g/kg of dry air) is ________ (correct to two decimal places).

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2018 · Paper 2

Question 42

Question 43

Question 44