Unit 25 - Chapter 116

Question 0

In a sliding vane design refrigeration compressor, a good seal is maintained between the vanes and cylinder by

Answer 0

Centrifugal force

Question 1

Which of the following is NOT a function of the refrigeration compressor?

Answer 1

Removed energy from the vapour

Question 2

Refrigerant compressors

Answer 2

Could be centrifugal

Question 3

The pressure ratio can be calculated by dividing

Answer 3

Absolute discharge pressure by absolute inlet pressure

Question 4

For a helical rotor design, which statement is true?

Answer 4

The driving rotor has less helical loves than the driven rotor has flutes

Question 5

A rotating mechanical seal is held in position by

Answer 5

A spring

Question 6

The safety head of a refrigeration compressor is designed to

Answer 6

Relieve pressure due to liquid in the cylinder

Question 7

The three main types of compressors are

Answer 7

Centrifugal, rotary, and reciprocating

Question 8

Refrigeration compressor mechanical seals have this advantage over packing glands

Answer 8

Less wear on the rotating shaft

Question 9

A disadvantage of hermetic compressors is

Answer 9

Fielding servicing is not possible

Question 10

The piston displacement of a reciprocating compressor can be defined as

Answer 10

Volume of refrigerant that can be circulated through all cylinders per unit of time