Book 2 Chapter 20: Refrigeration Accessories

Question 1

At least __________ pressure gauges are normally used on a refrigeration system.
A) 2
B) 3
C) 4
D) 5

Answer 1

A) 2

Question 2

Which of the following statements are correct pertaining to the location of the sight glass?
A) The sight glass will be installed at the receiver or condenser-receiver outlet if it is used to indicate whether the system is fully charged
B) The glass is installed before the expansion valve if is used to indicate if the refrigerant contains any flash vapour
C) If the glass is combined with a moisture indicator, and the liquid line from the receiver has a drier, then the glass should be installed between the drier and the expansion valve
D) All are correct

Answer 2

D) All are correct

Question 3

The type of piping and tubing material used in a refrigeration system depends upon the:
A) Size of the piping and tubing required
B) Refrigerant used
C) Application
D) All of the above

Answer 3

D) All of the above

Question 4

What size of pipe schedule should be used when the diameter of steel piping is 25mm or less?
A) 40
B) 80
C) 120
D) 160

Answer 4

B) 80

Question 5

The diffuser on the emergency release line is placed not less than _________ away from any windows or other openings.
A) 2.4m (7.87ft)
B) 4.8m (15.75ft)
C) 7.6m (24.93ft)
D) 10m (32.81ft)

Answer 5

C) 7.6m (24.93ft)

Question 6

A chemical dot placed under the glass lens of a sight glass that is exposed to liquid refrigerant is used to indicate the:
A) Liquid flow
B) System pressure
C) Refrigerant level
D) Presence of moisture
E) Presence of foreign particles

Answer 6

D) Presence of moisture

Question 7

In order to have even refrigerant flow in a direct expansion type evaporator that has more than one refrigerant circuit, the system requires a/an:
A) Stop valve
B) Distributor
C) Expansion valve
D) Thermal regulator
E) Purge valve

Answer 7

B) Distributor

Question 8

Which of the following statements about refrigeration pressure gauges is true?
A) Only one pressure gauge is required for each system
B) Dials on refrigeration pressure gauges do not indicate saturation temperature
C) Permanently installed pressure gauges shall be constructed for at least 1.5 times the design pressure
D) They indicate pressures and corresponding temperatures in a system
E) Pressure gauges will not work if the system is equipped with pulsation dampers

Answer 8

D) They indicate pressures and corresponding temperatures in a system

Question 9

Which of the following pipe joints may be used for pressure exceeding 1750 kPa and 1 1/4 inch or smaller iron and steel piping?
A) Flared
B) Screwed
C) Soldered
D) Welded
E) None of these options

Answer 9

B) Screwed

Question 10

The accessory that maintains efficient heat transfer by collecting oil that coats the tubes of the condenser is called a/an:
A) Filter
B) Strainer
C) Oil separator
D) Oil scrubber
E) Strainer-drier

Answer 10

C) Oil separator

Question 11

Which of the following statements about strainers is false?
A) The strainer is installed in the suction line
B) Strainers prevent foreign particles from damaging compressor valves
C) Piping must be disconnected to clean the strainer
D) Strainers typically consist of a fine mesh screen basket
E) Hermetic type compressors are equipped with a built-in suction strainer

Answer 11

C) Piping must be disconnected to clean the strainer

Question 12

A simple trap located in the suction line before the compressor that collects liquid, where it evaporates and returns to the compressor as a gas, is called a/an:
A) Strainer-drier
B) Accumulator
C) Oil separator
D) Distributor
E) Stop valve

Answer 12

B) Accumulator

Question 13

A pressure relief device on a refrigeration system shall have sufficient capacity to prevent the pressure in the pressure vessel from rising more than ________ above the setting of the pressure relief device.
A) 20%
B) 15%
C) 10%
D) 25%
E) 50%

Answer 13

C) 10%

Question 14

Where must refrigeration system Vibration Absorbers be placed to most effectively absorb vibration and noise from the compressor?
A) In piping parallel with the compressor crankshaft
B) To the compressor enclosed housing
C) Attached directly to the side of the compressor
D) Attached to the crankshaft
E) Perpendicular to the compressor crankshaft

Answer 14

A) In piping parallel with the compressor crankshaft

Question 15

B52-05 code requires an emergency discharge valve in a Glass fronted red box outside the building. Other requirements include:
A) Manually operated valve on a horizontal pipe inside the building
B) Manually operated valve on a horizontal pipe
C) Automatically operated valve on a vertical discharge pipe
D) Remotely operated valve on a horizontal pipe
E) Manually operated valve on a vertical pipe

Answer 15

B) Manually operated valve on a horizontal pipe

Question 16

The moisture indicator is usually combined with the sight glass and it consists 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) Temperature
B) Colour
C) State
D) Heat
E) Pressure

Answer 16

B) Colour

Question 17

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, and on the outlet of each liquid receiver.
A) 10.0 kg (22lb)
B) 3.0 kg (6.6lb)
C) 8.0 kg (17.6lb)
D) 1.0 kg (2.2lb)
E) 5.0 kg (11lb)

Answer 17

B) 3.0 kg (6.6lb)

Question 18

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

Answer 18

E) Compressor and the evaporator

Question 19

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

Answer 19

B) Receiver and the expansion valve

Question 20

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) 75.0kg (165lb)
B) 50.0kg (110lb)
C) 100kg (220lb)
D) 5.0 kg (11lb)
E) 25kg (55lb)

Answer 20

B) 50.0kg (110lb)

Question 21

Horizontal refrigeration piping lines should have a downward slope of _________ in the direction of refrigerant flow:
A) 4.2 mm per metre ( 1/2 in per 10ft)
B) 4mm per metre (15/32in per 10ft)
C) 3mm per metre ( 3/8in per 10ft)
D) 5.2mm per metre (5/8in per 10ft)
E) 3.5mm per metre (7/16in per 10ft)

Answer 21

A) 4.2mm per metre (1/2in per 10ft)

Question 22

A heat exchanger is used in a compression refrigerating system to transfer heat from the relatively:
A) Warm liquid to the evaporator
B) Warm liquid to the condenser
C) Warm vapour flowing to the evaporator
D) Cold liquid flowing to the condenser
E) Cold liquid flowing to the evaporator

Answer 22

A) Warm liquid to the evaporator

Question 23

To prevent extreme pressure, mechanical refrigeration codes require that every refrigerating system shall be protected by:
A) A pressure relief device
B) A fusible plug
C) One or more pressure relief devices
D) Two qualified operators
E) A security system

Answer 23

C) One or more pressure relief devices

Question 24

Soft-solder fittings may only be used in refrigeration piping for tubing ________ O.D and smaller.
A) 19mm (3/4in)
B) 25mm (1in)
C) 13mm (1/2in)
D) 38mm (1 1/2in)
E) 32mm (1 1/4in)

Answer 24

C) 13mm (1/2in)

Question 25

In a compression refrigeration system a vibration absorber is used to reduce noise often transmitted through:
A) The condenser
B) The receiver
C) The expansion valve
D) Rigidly connected piping
E) The evaporator

Answer 25

D) Rigidly connected piping