RSES Refrigeration Fundamentals & System Components 4

Question 1

A reciprocating compressor with leaking discharge valves will most likely exhibit:

Accepted Answer

Lower than normal discharge pressure and reduced capacity

Answer

Leaking discharge valves allow compressed gas to flow back into the cylinder, reducing compression efficiency and lowering discharge pressure and system capacity.

Question 2

The term 'flooding back' in a refrigeration system describes:

Accepted Answer

Liquid refrigerant returning to the compressor through the suction line

Answer

Flooding back occurs when liquid refrigerant travels through the suction line to the compressor, risking hydraulic damage and oil dilution.

Question 3

What is the purpose of a crankcase heater on a refrigeration compressor?

Accepted Answer

Prevent refrigerant migration into the oil during off-cycle

Answer

Crankcase heaters keep the oil warm during off-cycles to prevent refrigerant from migrating into and dissolving in the crankcase oil.

Question 4

In an evaporative condenser, heat is primarily rejected by:

Accepted Answer

Latent heat of evaporation of water sprayed over the coil

Answer

Evaporative condensers reject heat mainly through the latent heat of water evaporation, making them more efficient than dry air-cooled condensers.

Question 5

Which of the following best describes 'approach temperature' for a water-cooled condenser?

Accepted Answer

Temperature difference between condensing refrigerant and leaving water

Answer

Approach temperature is the difference between the refrigerant condensing temperature and the leaving condenser water temperature, indicating heat exchanger efficiency.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Refrigeration Fundamentals & System Components 4