Chapter 120 Flashcards

1
Q

How many pressure gauges are usually installed on a refrigeration system?

A

two, high/low pressure sides of the compressor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The pressure gauges connected close to the compressor should be installed with?

A

pulsation dampers to prevent flickering

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

By code its required that when a pressure gauge is installed on the high pressure side the gauge must be graduated:

A

two times the design working pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Oil pressure differential can be found by subtracting the suction pressure from the?

A

oil pressure on the gauge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What can oil carry over in the condenser result in?

A

Low heat transfer, high power consumption, high compressor discharge pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Where is a oil separator installed on a refrigeration system?

A

between the compressor and the condenser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Where is a suction strainer installed on a refrigeration system?

A

in the suction line of the compressor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What can be installed to prevent ice buildup in the expansion valve?

A

filter-drier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where is the distributor installed on a refrigeration system?

A

directly downstream from the expansion valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is the distributor installed on a refrigeration system?

A

directly downstream from the expansion valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Where should vibration absorbers be installed?

A

as close to the compressor as possible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The two most common pressure relief devices for refrigeration systems are:

A

spring-loaded relief valves and fusible plugs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What kind of pipe joint should be used for high pressure 31.75mm or smaller piping?

A

screwed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Since ammonia causes corrosion of copper and copper alloys what metal must be used for piping?

A

steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Besides moisture what else can a refrigeration sight glass/moisture indicator detect?

A

restriction in the liquid line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are refrigeration isolation valves designed to do?

A

isolate system parts, be easy to operate, prevent the loss of refrigeration

17
Q

What are refrigeration isolation valves designed to do?

A

isolate system parts, be easy to operate, prevent the loss of refrigeration

18
Q

Which location doesnt require a stop valve by code to be installed on a refrigeration system?

A

suction inlet of each liquid reciever

19
Q

Discharge of refrigerants cannot be less than _____ from any window, ventilation opening or exit in any building.

A

7.6 m