Book 2: 4-20 - "Refrigeration Accessories" Flashcards
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)
E. 7.6 m (25 ft)
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)
D. 182.0 kg (400 lb)
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
C. Compressor and the evaporator
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)
C. 31.75 mm (1¼ in)
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)
B. 19 mm (¾ in)
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
B. Trap located in the suction line before the compressor
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
B. 1.2
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)
E. 4.2 mm per metre (½ in per 10 ft)
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
A. Compressor and the condenser
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
E. Increasing the temperature of the vapour from the evaporator helps liquid slugging in the compressor
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
C. Non-evaporation
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
B. 2 times
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
E. Cold vapour being drawn from the evaporator
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
B. Receiver and the expansion valve
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)
C. 13 mm (½ in)
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)
B. 3.0 kg (6.6 lb)
At least _____ pressure gauges are normally used on a refrigeration system.
Select one:
A. 2
B. 5
C. 4
D. 1
E. 3
A. 2
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
D. One or more pressure relief devices
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
D. The temperature of the hot liquid refrigerant coming from the receiver is decreased
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)
E. 76.2 mm (3 in)
