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BARC 2021 ME: Refrigeration & Air conditioning Nuclear Quiz 2

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Question 1

In ammonia water absorption system heat is supplied to generator by condensing steam at 0.2 MPa, 120.2oC. The Temperature to be maintained in refrigerator is -10oC and surrounding temperature is 30oC . Find Maximum COP of refrigerator.

Question 2

A vapour absorption refrigeration system works with generator, ambient and evaporator temperature as 360 k, 310 k and 260 k respectively. If the evaporator temperature falls to 250 k what should be the generator temperature in order to operate the system with same COP ?

Question 3

Air after passing from a heating coil of temperature 45 is obtained at 38. Calculate inlet air temperature, if the bypass factor of the coil is 0.35.

Question 4

During chemical dehumidification process of air _______.

Question 5

There is a refrigeration machine which have coefficient of performance equal to 1.5. It is used to remove heat at the rate of 1000 kJ/min. The power required for this machine is:

Question 6

Which of the following statements is incorrect with respect to air standard refrigeration cycle

Question 7

Air is compressed in a compressor with isentropic efficiency 85%. The inlet and outlet temperature of air is 300 k and 430 k respectively. The theoretical temperature at the outlet of compressor will be (in K)

Question 8

Condensing temperature in a refrigerator is the temperature ____________.

Question 9

Heat Rejection Factor (H.R.F) is given by

(where the COP is that of a refrigerator)

Question 10

The un-desirable property of a refrigerant is
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