RFRG 6009 - Refrigeration Accessories (Chp 20)

Question 1

A chemical dot placed under the glass lens of a sight glass that is exposed to liquid refrigerant is used to indicate the:

A) Refrigerant level
B) Presence of foreign particles
C) Presence of moisture
D) System pressure
E) Liquid flow

Answer 1

B) Presence of foreign particles

Question 2

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) Distributor
B) Thermal regulator
C) Expansion valve
D) Stop valve
E) Purge valve

Answer 2

A) Distributor

Question 3

Which of the following statements about refrigeration pressure gages is true?

A) Permanently installed pressure gages shall be constructed for at least 1.5 times the design pressure
B) Pressure gage will not work if the system is equipped with pulsation dampeners
C) Dials on refrigeration pressure gages do not indicate saturation temperature
D) Only one pressure gage is required for each system
E) They indicate pressures and corresponding temperatures in a system

Answer 3

E) They indicate pressures and corresponding temperatures in a system

Question 4

Which of the following pipe joints may be used for pressure exceeding 1750 kPa and 1 ¼ inch or smaller iron and steel piping? (Use pipe tables from “Academic Supplement” to determine DN# of 1 ¼ pipe)

A) Screwed
B) Flared
C) None of these options
D) Welded
E) Soldered

Answer 4

A) Screwed

Question 5

The accessory that maintains efficient heat transfer by collecting oil that coats the tubes of the condenser is called a/an:

A) Strainer-drier
B) Strainer
C) Oil separator
D) Filter
E) Oil scrubber

Answer 5

C) Oil separator

Question 6

Which of the following statements about strainers is false?

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

Answer 6

B) Piping must be disconnected to clean the strainer

Question 7

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) Oil separator
C) Stop valve
D) Distributor
E) Accumulator

Answer 7

E) Accumulator

Question 8

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) 15%
B) 50%
C) 25%
D) 20%
E) 10%

Answer 8

E) 10%

Question 9

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) Attached to the crankshaft
C) Attached directly to the side of the compressor
D) To the compressor enclosure housing
E) Perpendicular to the compressor crankshaft

Answer 9

A) In piping parallel with the compressor crankshaft

Question 10

B52-05 code requires an emergency discharge valve in a Glass fronted red box outside the building. Other requirements include:

A) Remotely operated valve on a horizontal pipe
B) Manually operated valve on a horizontal pipe
C) Manually operated valve on a horizontal pipe inside the building
D) Automatically operated valve on a vertical discharge pipe
E) Manually operated valve on a vertical pipe

Answer 10

B) Manually operated valve on a horizontal pipe