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BARC 2021 ME: Refrigeration & Air conditioning Nuclear Quiz 1

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Question 1

Cascade Refrigeration is used for very low refrigeration temperature by using two VCRS cycle, COP of first cycle is 4 and COP of second cycle is 5. Then find the overall COP of refrigeration ______.

Question 2

An ice making plant using refrigerant R-12 is having an evaporator saturation temperature of –25°C  and the condenser saturation temperature of 35°C . The vapour is leaving the compressor at 65°C . Following table shows the properties of the refrigerant.

Calculate the Coefficient of Performance (COP) of this system & Power consumption If the capacity of the plant is 5 kW. 

Question 3

What is the function of rectifier in a practical vapour absorption refrigeration system?

Question 4

In a simple vapour compression refrigeration cycle, the swept volume for the compressor is 2 litres and its volumetric efficiency is 80%. If the speed of the compressor is 1800rpm. Calculate the mass flow rate, . Take the value of

Question 5

A thin layer of water in field is formed after a farmer has watered it. The ambient air conditions are: temperature 20 °C and relative humidity 5%. An extract of steam tables is given below.

Neglecting the heat transfer between the water and the ground, the water temperature in the field after phase equilibrium is reached equals

Question 6

Ammonia is one of the oldest refrigerants, which is still used widely, because:

Question 7

Difference between the Wet bulb temperature (WBT) and DBT (Dry Bulb temperature) is known as __________.

Question 8

Which of the following is not an advantage of three fluids absorption system?

Question 9

Choose the correct statement about the effect of changing various operating conditions of a vapour compression refrigeration cycle:

Question 10

Degree of saturation is the ratio of ________?
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