Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or less
  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more

2: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above

3: The oil separator is always inserted in the system

  • to prevent oil logging
  • where it can be easily serviced
  • in the discharge line
  • in a cool spot

4: Doors communicating with outside from a mechanical room must be?

  • Self-closing, aligned, fire door
  • Steel, approved, weather-stripped
  • Self-closing, approved, fire door
  • Self-closing, wooden, fire door

5: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

6: What is a megaohm meter?

  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

7: The leaving chilled water set point for comfort cooling is typically?

  • 45
  • 38
  • 60
  • 66

8: A relief valve shall be located at least ___ above grade.

  • 10'
  • 25'
  • 36'
  • 15'

9: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

10: What is an example of institutional occupancy?

  • Hospital
  • Football stadium
  • Dorms
  • Shopping mall

11: Pi equals approximately

  • 3.41
  • 746
  • 3.14
  • 12,000

12: Who approves containers for refrigerants?

  • D.O.D
  • E.P.A
  • D.O.E
  • D.O.T

13: The Department that certifies the transportation of refrigerant is the

  • RSES
  • DOT
  • EPA
  • EPO

14: No open flames are allowed in the machinery room unless?

  • Approved by the authorized person
  • Only when combustion air is provided from outside of the machinery room
  • Never can be allowed
  • Approved by the installing contractor

15: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • insulated
  • moisture barrier
  • leak checked

16: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices

17: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • outside the room, immediately adjacent to each door
  • inside the room, immediately adjacent to each door
  • on a conspicuous card located near the compressor
  • on a conspicuous card located near the evaporator

18: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • EPR valve
  • Solenoid valve
  • CPR valve
  • EEV

19: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 550
  • 100
  • 350
  • 50

20: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

21: The best way to determine the voltage requirement for an electrical component is to

  • read the voltage with a mulitmeter
  • read the nameplate data
  • determine the capacity of the service panel
  • check with the utility company

22: What pipe can not be used for refrigeration?

  • M
  • K
  • L
  • N

23: Volts x amps equals

  • Impedance
  • Watts
  • Ohms Law
  • Inductance

24: A relief valve discharge capacity is rated in

  • PSIA
  • PSIG
  • temperature minus pounds of air per second divided by release rate squared
  • Pounds of air per minute.

25: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • pre-rotational guide vanes
  • post-rotational guide vanes
  • check valves