Book 2: 4-20 - "Refrigeration Accessories"

Question 1

The diffuser on the emergency release line is placed not less than _____ away from any windows or other openings.
Select one:

A. 9.1 m (30 ft)

B. 3 m (10 ft)

C. 2.5 m (8 ft)

D. 4.6 m (15 ft)

E. 7.6 m (25 ft)

Answer 1

E. 7.6 m (25 ft)

Question 2

The applicable code requires that each refrigerating system containing _____ or more of 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.
Select one:

A. 91.0 kg (200 lb)

B. 45.0 kg (100 lb)

C. 273.0 kg (600 lb)

D. 182.0 kg (400 lb)

E. 136.0 kg (300 lb)

Answer 2

D. 182.0 kg (400 lb)

Question 3

The strainer in a compression refrigeration system is placed between the:
Select one:

A. Condenser and the receiver

B. Receiver and the expansion valve

C. Compressor and the evaporator

D. Compressor and the condenser

E. Expansion valve and the evaporator

Answer 3

C. Compressor and the evaporator

Question 4

Screwed joints in refrigeration piping for pressures of 1750 kPa and higher are limited to pipe _____ and smaller.
Select one:

A. 51 mm (2 in)

B. 76.2 mm (3 in)

C. 31.75 mm (1¼ in)

D. 38 mm (1½ in)

E. 63.5 mm (2½ in)

Answer 4

C. 31.75 mm (1¼ in)

Question 5

Flared compression fittings may be used in refrigeration piping for joining soft-temper copper tubing up to _____ outside diameter
Select one:

A. 38 mm (1½ in)

B. 19 mm (¾ in)

C. 13 mm (½ in)

D. 32 mm (1¼ in)

E. 25 mm (1 in)

Answer 5

B. 19 mm (¾ in)

Question 6

An accumulator in a compression refrigeration system is a/an:
Select one:

A. Another name for the evaporator

B. Trap located in the suction line before the compressor

C. Place to store excess refrigerant vapour

D. Place to store excess liquid refrigerant

E. Collector for compressor oil

Answer 6

B. Trap located in the suction line before the compressor

Question 7

The applicable code requires that when a pressure gauge is permanently installed on the high side of a system, the dial of the gauge must be graduated to no case less than _____ times the design working pressure.
Select one:

A. 1

B. 1.2

C. 2

D. 1.5

E. 3

Answer 7

B. 1.2

Question 8

Horizontal refrigeration piping lines should have a downward slope of _____ in the direction of refrigerant flow.
Select one:

A. 3.5 mm per metre (7/16 in per 10 ft)

B. 5.2 mm per metre (5/8 in per 10 ft)

C. 3 mm per metre (3/8 in per 10 ft)

D. 4 mm per metre (15/32 in per 10 ft)

E. 4.2 mm per metre (½ in per 10 ft)

Answer 8

E. 4.2 mm per metre (½ in per 10 ft)

Question 9

The oil separator in a compression refrigeration system is placed between the:
Select one:

A. Compressor and the condenser

B. Receiver and the expansion valve

C. Condenser and the receiver

D. Compressor and the evaporator

E. Expansion valve and the evaporator

Answer 9

A. Compressor and the condenser

Question 10

One of the advantages of using a heat exchanger in a compression refrigeration system is:
Select one:

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

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

C. Decreasing the temperature of the vapour from the evaporator helps liquid slugging in the compressor

D. Decreasing the temperature of the vapour from the evaporator helps to prevent liquid slugging in the compressor

E. Increasing the temperature of the vapour from the evaporator helps liquid slugging in the compressor

Answer 10

E. Increasing the temperature of the vapour from the evaporator helps liquid slugging in the compressor

Question 11

The purge valve is used to vent _____ gases from the refrigeration system.
Select one:

A. Compressor

B. Evaporation

C. Non-evaporation

D. Non-condensable

E. Condensable

Answer 11

C. Non-evaporation

Question 12

The applicable code requires that when a pressure gauge is permanently installed on the high side of a system, the dial of the gauge must be graduated up to _____ the operating pressure.
Select one:

A. 1 times

B. 2 times

C. 2.5 times

D. 1.5 times

E. 3 times

Answer 12

B. 2 times

Question 13

A heat exchanger is used in a compression refrigerating system to transfer heat to the:
Select one:

A. Hot vapour being drawn from the evaporator

B. Cold liquid being drawn from the evaporator

C. Hot vapour being drawn from the condenser

D. Cold vapour being drawn from the condenser

E. Cold vapour being drawn from the evaporator

Answer 13

E. Cold vapour being drawn from the evaporator

Question 14

The moisture indicator and sight glass in a compression refrigeration system is placed between the:
Select one:

A. Compressor and the evaporator

B. Receiver and the expansion valve

C. Condenser and the receiver

D. Compressor and the condenser

E. Expansion valve and the evaporator

Answer 14

B. Receiver and the expansion valve

Question 15

Soft-solder fittings may only be used in refrigeration piping for tubing _____ O.D. and smaller.
Select one:

A. 32 mm (1¼ in)

B. 38 mm (1½ in)

C. 13 mm (½ in)

D. 19 mm (¾ in)

E. 25 mm (1 in)

Answer 15

C. 13 mm (½ in)

Question 16

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.
Select one:

A. 8.0 kg (17.6 lb)

B. 3.0 kg (6.6 lb)

C. 1.0 kg (2.2 lb)

D. 5.0 kg (11 lb)

E. 10.0 kg (22 lb)

Answer 16

B. 3.0 kg (6.6 lb)

Question 17

At least _____ pressure gauges are normally used on a refrigeration system.
Select one:

A. 2

B. 5

C. 4

D. 1

E. 3

Answer 17

A. 2

Question 18

To prevent extreme pressure, mechanical refrigeration codes require that every refrigerating system shall be protected by:
Select one:

A. Two qualified operators

B. A pressure relief device

C. A security system

D. One or more pressure relief devices

E. A fusible plug

Answer 18

D. One or more pressure relief devices

Question 19

One of the advantages of using a heat exchanger in a compression refrigeration system is:
Select one:

A. The pressure of the hot liquid refrigerant coming from the receiver is reduced

B. The temperature of the hot liquid refrigerant coming from the receiver is increased

C. The temperature of the hot refrigerant vapour coming from the receiver is decreased

D. The temperature of the hot liquid refrigerant coming from the receiver is decreased

E. The temperature of the hot liquid refrigerant coming from the evaporator is reduced

Answer 19

D. The temperature of the hot liquid refrigerant coming from the receiver is decreased

Question 20

Screwed joints in refrigeration piping may be used on piping sizes up to _____ provided the refrigerant pressures do not exceed 1750 kPa.
Select one:

A. 89 mm (3½ in)

B. 38 mm (1½ in)

C. 51 mm (2 in)

D. 63.5 mm (2½ in)

E. 76.2 mm (3 in)

Answer 20

E. 76.2 mm (3 in)