Question 1

The compression ratio for an R-22 compressor operating with 68.5 psig suction pressure and 260 psig heat pressure is ____________________.

Accepted Answer

The answer of The compression ratio for an R-22 compressor...

Question 2

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

Accepted Answer

A)   will increase
B)   will decrease
C)   will remain the same
D)   cannot be determined

Question 3

A decrease in suction pressure will have what effect on a reciprocating compressor?

Accepted Answer

The compre...

Question 4

The rotary screw compressor uses an open motor instead of the hermetic design.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A)   it allows a compressor design with less clearance volume
B)   it operates with less spring tension
C)   the amount of expanded vapor in the cylinder is greater
D)   it will not allow liquid refrigerant in the cylinder A

Question 6

The screw compressor is used primarily in ____.

Accepted Answer

A)   large commercial and industrial systems
B)   residential air conditioning
C)   small commercial refrigeration units
D)   domestic refrigerators

Question 7

Rotary compressors have pistons that rotate inside the cylinders.

Accepted Answer

A) True 
 B)False

Question 8

The space at the top of the cylinder when the piston reaches the top of its stroke is called ____________________.

Accepted Answer

The answer of The space at the top of the...

Question 9

Scroll compressors are becoming popular because they can handle liquid floodback without compressor damage.

Accepted Answer

A) True 
 B)False

Question 10

The clearance volume of a compressor cylinder is the ____.

Accepted Answer

A)   amount of refrigerant vapor the compressor cylinder will hold during each stroke
B)   volume by which the compressor is rated
C)   volume of the space between the bottom of the valve plate and the top of the piston at the top of the stroke
D)   total volume of the cylinder when the piston is at the bottom dead-center

Question 11

A compressor that has the motor and compressor in a housing that is bolted together is called a(n) ____________________ type.

Accepted Answer

semihermet...

Question 12

Explain when the compressor's lubrication system is fully effective.

Accepted Answer

There is no pressure lubricati...

Question 13

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

Accepted Answer

A)   subcooled from the condenser
B)   superheated from the condenser
C)   superheated from the evaporator
D)   subcooled from the evaporator

Question 14

The higher the rpm of a compressor, the higher the pumping efficiency.

Accepted Answer

A) True 
 B)False

Question 15

____________________ is a bimetallic disc that senses compressor discharge temperature and opens at 270ºF.

Accepted Answer

Temperature-operated disc,Temp...

Question 16

When the piston reaches the bottom of its stroke, it is called ____________________.

Accepted Answer

bottom dea...

Question 17

Why can't reciprocating compressors pump liquid?

Accepted Answer

Liquids cannot be co...

Question 18

The sight glass on a semihermetic compressor is used to allow light to enter the crankcase to keep the oil warm .

Accepted Answer

A) True 
 B)False  False

Question 19

____________________ opens at approximately 400 ± 50 psi differential between high- and low-side pressures for R-22, and at a 500 to 625 psi differential for R-410A.

Accepted Answer

Internal pressure re...

Question 20

Excessive heat and pressure on the oil in a compressor can cause oil to break down and cause the formation of ____________________ and acid.

Accepted Answer

carbon

Exam 23: Compressors

The compression ratio for an R-22 compressor operating with 68.5 psig suction pressure and 260 psig heat pressure is ____________________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A decrease in suction pressure will have what effect on a reciprocating compressor?

Correct AnswerverifiedThe compre...View AnswerShow Answer

The rotary screw compressor uses an open motor instead of the hermetic design.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

The screw compressor is used primarily in ____.

Correct AnswerverifiedShow Answer

Rotary compressors have pistons that rotate inside the cylinders.

Correct AnswerverifiedShow Answer

The space at the top of the cylinder when the piston reaches the top of its stroke is called ____________________.

Correct AnswerverifiedShow Answer

Scroll compressors are becoming popular because they can handle liquid floodback without compressor damage.

Correct AnswerverifiedShow Answer

The clearance volume of a compressor cylinder is the ____.

Correct AnswerverifiedShow Answer

A compressor that has the motor and compressor in a housing that is bolted together is called a(n) ____________________ type.

Correct Answerverifiedsemihermet...View AnswerShow Answer

Explain when the compressor's lubrication system is fully effective.

Correct AnswerverifiedThere is no pressure lubricati...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

The higher the rpm of a compressor, the higher the pumping efficiency.

Correct AnswerverifiedShow Answer

____________________ is a bimetallic disc that senses compressor discharge temperature and opens at 270ºF.

Correct AnswerverifiedTemperature-operated disc,Temp...View AnswerShow Answer

When the piston reaches the bottom of its stroke, it is called ____________________.

Correct Answerverifiedbottom dea...View AnswerShow Answer

Why can't reciprocating compressors pump liquid?

Correct AnswerverifiedLiquids cannot be co...View AnswerShow Answer

The sight glass on a semihermetic compressor is used to allow light to enter the crankcase to keep the oil warm .

Correct AnswerverifiedFalse

____________________ opens at approximately 400 ± 50 psi differential between high- and low-side pressures for R-22, and at a 500 to 625 psi differential for R-410A.

Correct AnswerverifiedInternal pressure re...View AnswerShow Answer

Excessive heat and pressure on the oil in a compressor can cause oil to break down and cause the formation of ____________________ and acid.

Correct Answerverifiedcarbon

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The compre...
View Answer

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
semihermet...
View Answer

Correct Answer
verified
There is no pressure lubricati...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Temperature-operated disc,Temp...
View Answer

Correct Answer
verified
bottom dea...
View Answer

Correct Answer
verified
Liquids cannot be co...
View Answer

Correct Answer
verified
False

Correct Answer
verified
Internal pressure re...
View Answer

Correct Answer
verified
carbon