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UP Polytechnic Lecturer: Mechanical Paper -2 || Quiz 6

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Question 1

Change in entropy of universe during reversible cyclic processes is

Question 2

The moisture in a refrigerant is removed by

Question 3

“The velocity of entrance and exit through a nozzle remains the same.” Is this ever possible?

Question 4

A pump delivers water at a rate of 0.25 m³/s against a head of 20 m .If the overall efficiency of the pump is 50%, the power required by the pump is _________.

Question 5

For two infinite parallel gray planes with emissivities ∈₁= ∈₂ = 0.5, the view factor of each plate is

Question 6

According to Prandtl Blasius relation, the thickness of boundary layer in turbulent flow is______.

Question 7

Compression ratio of I.C. engine is

Question 8

The vapour compression refrigerator follows which of the following cycle

Question 9

Two walls of same thickness and cross-sectional area have thermal conductivities in the ratio 1 : 2. If the same temperature difference difference is maintained across the two faces of both the walls, what is the ratio of heat flow

Question 10

Choose the correct relationship between COP of refrigerator and Heat Pump.

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