Chapter 20 Refrigeration Accessories

Question 1

1. The purge valve is used to vent \_\_\_\_\_ gases from the refrigeration system.
A. Non-condensable
B. Condensable
C. Compressor
D. Non-evaporation
E. Evaporation

Answer 1

A. Non-condensable

Question 2

2. The moisture indicator and sight glass in a compression refrigeration system is
placed between the:
A. Compressor and the evaporator
B. Condenser and the receiver
C. Receiver and the expansion valve
D. Expansion valve and the evaporator
E. Compressor and the condenser

Answer 2

C. Receiver and the expansion valve

Question 3

3. The applicable code requires that each refrigerating system containing _____ or
   more of all refrigerants other than Group A1 refrigerant having an operating
   pressure over 103 kPa shall be constructed so the refrigerant can be discharged
   into the atmosphere by means of a manually operated valve to be used in case of
   emergency.
   A. 182.0 kg (400 lb)
   B. 91.0 kg (200 lb)
   C. 273.0 kg (600 lb)
   D. 136.0 kg (300 lb)
   E. 45.0 kg (100 lb)

Answer 3

B. 91.0 kg (200 lb)

Question 4

4. One of the advantages of using a heat exchanger in a compression refrigeration
   system is:
   A. Increasing the temperature of the vapour from the evaporator helps liquid slugging
   in the compressor
   B. Decreasing the temperature of the vapour from the evaporator helps to prevent
   liquid slugging in the compressor
   C. Increasing the temperature of the vapour from the evaporator helps to prevent
   liquid slugging in the compressor
   D. Decreasing the temperature of the vapour from the evaporator helps liquid
   slugging in the compressor
   E. Increasing the temperature of the vapour from the evaporator helps to prevent
   liquid slugging in the evaporator

Answer 4

C. Increasing the temperature of the vapour from the evaporator helps to prevent
liquid slugging in the compressor

Question 5

5. The fusible plug relief device consists of a connection filled with a metal alloy
designed to:
A. Freeze at a specific temperature
B. Melt at a specific pressure
C. Melt at a specific temperature
D. Freeze at a specific pressure
E. Vaporize at a specific temperature

Answer 5

C. Melt at a specific temperature

Question 6

6. The strainer-drier in a compression refrigeration system is placed between the:
A. Compressor and the evaporator
B. Receiver and the expansion valve
C. Condenser and the receiver
D. Expansion valve and the evaporator
E. Compressor and the condenser

Answer 6

B. Receiver and the expansion valve

Question 7

7. A heat exchanger is used in a compression refrigerating system to transfer heat to
   the:
   A. Cold vapour being drawn from the evaporator
   B. Hot vapour being drawn from the evaporator
   C. Cold vapour being drawn from the condenser
   D. Hot vapour being drawn from the condenser
   E. Cold liquid being drawn from the evaporator

Answer 7

A. Cold vapour being drawn from the evaporator

Question 8

8. Steel refrigeration piping of schedule 40 may be used when the diameter over:
A. 13 mm (½ in)
B. 19 mm (¾ in)
C. 25 mm (1 in)
D. 32 mm (1¼ in)
E. 38 mm (1½ in)

Answer 8

C. 25 mm (1 in)

Question 9

9. The distributor in a compression refrigeration system is directly downstream from
the:
A. Compressor
B. Evaporator
C. Condenser
D. Expansion valve
E. Receiver

Answer 9

D. Expansion valve

Question 10

10.The applicable code specifies that when a system contains more than _____ of
refrigerant, stop valves are required on the suction and discharge of each
compressor, compressor unit, or condensing unit and on the outlet of each liquid
receiver.
A. 1.0kg (2.2 lb)
B. 8.0kg (17.6 lb)
C. 5.0kg (11 lb)
D. 3.0kg (6.6 lb)
E. 10.0kg (22 lb)

Answer 10

D. 3.0kg (6.6 lb)

Question 11

11.At least \_\_\_\_\_ pressure gauges are normally used on a refrigeration system.
A. 2
B. 3
C. 4
D. 5
E. 1

Answer 11

A. 2

Question 12

12.Screwed joints in refrigeration piping may be used on piping sizes up to _____
provided the refrigerant pressures do not exceed 1750 kPa.
A. 89 mm (3½ in)
B. 63.5 mm (2½ in)
C. 38 mm (1½ in)
D. 51 mm (2 in)
E. 76.2 mm (3 in)

Answer 12

D. 51 mm (2 in)

Question 13

13.An accumulator in a compression refrigeration system is a/an:
A. Collector for compressor oil
B. Place to store excess liquid refrigerant
C. Another name for the evaporator
D. Trap located in the suction line before the compressor
E. Place to store excess refrigerant vapour

Answer 13

D. Trap located in the suction line before the compressor

Question 14

14.The applicable code requires a stop valve on the inlet of each liquid receiver of
systems containing _____ or more of refrigerant, except when the receiver is part
of a condensing unit or forms an integral part of a condenser.
A. 100.0 kg (220 lb)
B. 75.0 kg (165 lb)
C. 5.0 kg (11 lb)
D. 25.0 kg (55 lb)
E. 50.0 kg (110 lb)

Answer 14

E. 50.0 kg (110 lb)

Question 15

15.In a direct-expansion compression refrigeration system the distributor ensures that
the liquid refrigerant is evenly distributed to all:
A. Compressors
B. Receivers
C. Condensers
D. Expansion valves
E. Evaporators

Answer 15

E. Evaporators

Question 16

16.In a compression refrigeration system a vibration absorber is used to reduce noise
often transmitted through:
A. Rigidly connected piping
B. The Condenser
C. The Evaporator
D. The Receiver
E. The Expansion valve

Answer 16

A. Rigidly connected piping

Question 17

17.The moisture indicator is usually combined with the sight glass and it consists
simply of a chemical dot placed under the glass lens so it is exposed to the liquid,
any change in _____ due to the presence of moisture is easily observed.
A. Pressure
B. Temperature
C. Heat
D. Colour
E. State

Answer 17

D. Colour