Chapter 119

Question 1

Expansion valves regulate the liquid refrigerant flow to the______

Answer 1

evaporator

Question 2

What is provided when a thermostatic expansion valve is installed on an evaporator which has a large pressure drop across it?

Answer 2

equalizing line

Question 3

Manual or hand operated expansion valves are seldom used in modern refrigeration systems except in a bypass line ___________________

Answer 3

around an automatic control valve

Question 4

What operation stops the compressor when the desired low temperature of a subtance to be cooled is reached and starts the compressor up again when the temperature rises to a set level?

Answer 4

intermittent operation

Question 5

The control which results in a reduction of power required by the compressor is:

Answer 5

the variable inlet guide vanes

Question 6

What maintains a constant level of liquid refrigerant in a flooded evaporator in the liquid reserve tank?

Answer 6

low pressure float valve

Question 7

What is used to control evaporator capacity?

Answer 7

Sectional evaporators, and evaporator dampers

Question 8

How is the capacity of a reciprocating compressor controlled?

Answer 8

Cylinder unloaders, cylinder bypass, and hot gas bypass

Question 9

Why are hot gas bypass undesirable for use by itself?

Answer 9

Compressor can overheat and no power reduction