61) A refrigerant with highest critical pressure is

Carbon-dioxide

Ammonia

Freon-11

Freon-22

Answer is:

Freon-22

ISRO Technician-B MRAC Question Paper - 2017 (Set -1) with Answer Key

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62) Approach of cooling tower means

difference in temperature of the cold water and atmospheric temperature

difference in temperature of hot water entering and cold water leaving

amount of heat thrown away by the cooling tower in kcal/hr

difference in temperature of the cold water leaving the cooling tower and the wet bulb temperature of surrounding air

Answer is:

difference in temperature of the cold water leaving the cooling tower and the wet bulb temperature of surrounding air

63) A power element in thermostatic expansion valve having the same refrigerant charged as the refrigeration system is called

Cross charged valve

Straight charged valve

Pilot operated solenoid valve

Three way mixing valve

Answer is:

Straight charged valve

64) Cooling effected by using secondary refrigerants is called

Direct system

Indirect system

Cross system

Isolated system

Answer is:

Indirect system

65) Leakage in the refrigeration system using ammonia as refrigerant detected by

Soap and water

Burning candle

Sulphur sticks

Halide torch

Answer is:

Sulphur sticks

ISRO Technician-B MRAC Question Paper - 2017 (Set -1) with Answer Key

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61) A refrigerant with highest critical pressure is

Freon-22

ISRO Technician-B MRAC Question Paper - 2017 (Set -1) with Answer Key

Related ISRO Technician-B MRAC Question Paper - 2017 (Set -1) with Answer Key

62) Approach of cooling tower means

difference in temperature of the cold water leaving the cooling tower and the wet bulb temperature of surrounding air

63) A power element in thermostatic expansion valve having the same refrigerant charged as the refrigeration system is called

Straight charged valve

64) Cooling effected by using secondary refrigerants is called

Indirect system

65) Leakage in the refrigeration system using ammonia as refrigerant detected by

Sulphur sticks

ISRO Technician-B MRAC Question Paper - 2017 (Set -1) with Answer Key