Chapter 119

Question 0

The simple control which restricts the flow of liquid from the condenser to the evaporator and maintains a pressure differential between the two units because of its length and small bore is called a/an ____.

Answer 0

Capillary tube

Question 1

The type of operation which stops the compressor when the desired low temperature of the substance to be cooled is reached and starts the compressor up again when the temperature rises to a set level is called:
A) intermittent
B) continuous with reduced output
C) cylinder bypass
D) unloading
E) variable guide

Answer 1

A) intermittent

Question 2

How is the capacity of a reciprocating compressor controlled?
A) variable speed control
B) inlet vane control
C) cylinder unloaders
D) cylinder bypass
E) hot gas bypass
F) A & E
G) C, D & E

Answer 2

G) C, D & E

Cylinder unloaders and bypass, and hot gas bypass

Question 3

What is used to control evaporator capacity?
A) capillary tubes
B) sectional evaporators
C) evaporator dampers
D) hot gas bypass
E) A & D
F) B & C

Answer 3

F) B & C

Sectional evaporators and evaporator dampers

Question 4

Reason(s) why the hot gas bypass is undesirable for use by itself is/are:
A) compressor can overheat
B) no power reduction
C) low evaporator temperatures
D) A & B

Answer 4

D) A & B

Compressor can overheat and no power reduction