CRST Refrigeration Systems & Components 2

Question 1

What is the primary function of a receiver in a refrigeration system?

Accepted Answer

Store liquid refrigerant after the condenser

Answer

A receiver stores liquid refrigerant downstream of the condenser to ensure a steady supply to the metering device.

Question 2

Which type of compressor uses a rotating eccentric to compress refrigerant without inlet/outlet valves?

Accepted Answer

Scroll compressor

Answer

Scroll compressors use two interleaved spiral scrolls to compress refrigerant continuously without the need for suction or discharge valves.

Question 3

What happens to refrigerant subcooling when liquid line length increases significantly?

Accepted Answer

Subcooling decreases due to heat gain

Answer

Longer liquid lines expose refrigerant to more ambient heat, reducing subcooling and risking flash gas formation before the metering device.

Question 4

A refrigeration system uses a flooded evaporator. What distinguishes it from a dry-expansion evaporator?

Accepted Answer

Refrigerant fills the entire evaporator with liquid

Answer

In a flooded evaporator, the entire heat exchanger is filled with liquid refrigerant, maximizing heat transfer surface contact.

Question 5

What is the purpose of a suction accumulator in a refrigeration system?

Accepted Answer

Prevent liquid refrigerant from entering the compressor

Answer

A suction accumulator catches liquid slugs before the compressor, protecting it from hydraulic damage.

(CRST) Certified Refrigeration Service Technician Practice Test