Unit 23

True

(T/F) A bolted together motor-compressor assembly is sometimes referred to as a semi-hermetic type.

True

(T/F) Because a scroll compressor's has fewer moving parts, it operates much quieter than other compressor designs and technologies.

False

(T/F) Rotary compressors have pistons that rotate inside the cylinders.

True

(T/F) SEER is calculated based on the total amount of cooling the system will provide over the entire season, divided by the total number Watt-Hours it will consume.

True

(T/F) Scroll compressors are becoming popular because they can handle liquid flood back without compressor damage.

False

(T/F) The hermetic reciprocating compressor motor is essentially made of the same materials as an open type compressor motor.

False

(T/F) The higher the rpm of a compressor, the higher the pumping efficiency.

True

(T/F) The rotary screw compressor uses an open motor instead of the hermetic design.

False

(T/F) The scroll compressor is one type of reciprocating compressor.

True

(T/F) The shell of a hermetic type reciprocating compressor is generally considered to be on the low pressure side of the system.

False

(T/F) The sight glass on a semi-hermetic compressor is used to allow light to enter the crankcase to keep the oil warm.

True

(T/F) Mufflers are used in many fully hermetic compressors to muffle compressor pulsation noise.

Will increase

If the compression ratio of a system with a reciprocating compressor decreases, the amount of refrigerant pumped by the compressor ____.

Damaged valves and piston rings

Liquid entering the compression chamber of a reciprocating compressor can lead to ____.

Superheated from the evaporator

Most of the heat energy in the suction vapor entering the compressor is _____.

Residential air conditioning

Rotary compressors are used primarily in _____.

Volume of the space between the bottom of the valve plate and the top of the piston at the top of the stroke

The clearance volume of a compressor cylinder is the ____.

It allows a compressor design with less clearance volume

The discus valve design is more efficient than a flapper valve design because _____.

Large industrial refrigeration and air conditioning systems

The screw compressor is used primarily in ____.

Very warm

The temperature of the compressed gas leaving the compressor can best be described as ____.