Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How many gallons of water do you need per pound of ammonia?

  • 1
  • 50
  • 10
  • 100

2: The two basic types of evaporators are

  • prime surface and finned
  • flooded and direct expansion
  • direct expansion and plate
  • finned and plate

3: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

4: Control systems can be classified by

  • tonnage of system
  • safety
  • economy of operation
  • source of power

5: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • a fusible plug
  • a pressure relief device
  • either a fusible plug or a pressure relief device
  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified

6: Where is the high-side float located on a chiller system?

  • discharge line
  • liquid line
  • inside the chiller barrel
  • flash line

7: How many BTU's is produced by one watt of energy

  • 1
  • 2.57
  • 3.41
  • 3.00

8: What pipe can not be used for refrigeration?

  • K
  • N
  • L
  • M

9: Who is permitted to access a refrigeration machine room?

  • Contractors only
  • Anyone, it's a completely safe area
  • Authorized persons only
  • Any employee

10: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • The rate of conduction
  • 1 BTU
  • 1 Kelvin
  • 1 Therm

11: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

12: When an inspection is needed, how often must it be done?

  • every 24 months
  • every 18 months
  • every 36 months
  • annually

13: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 100
  • 90
  • 80
  • 110

14: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • boost voltage
  • pick up voltage
  • run voltage
  • lift voltage

15: Who authorizes changes to the safety codes?

  • Person in charge of the facility
  • Person who pulled the permit
  • Contractor who last serviced the system.
  • Board of Boilers

16: Which winding have the most turns?

  • they have equal amount of turns
  • Start
  • run
  • depends on the motor phase

17: Give an example of a secondary coolant?

  • R-718
  • R-717
  • R-12
  • R-410A

18: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • far apart or greater difference
  • 2F difference
  • nearly the same
  • a ling psychrometer doesn't have two theremometers.

19: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and castor
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor

20: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

21: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

22: By using nitrogen within a pipe during brazing operation,

  • Discoloration is prevented
  • Copper oxide formation is prevented
  • Exterior scale formation is minimized
  • The explosion hazard is confined

23: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 100,000
  • 10,000
  • 1,000
  • 100

24: What is the refrigerant chlorodifluoromethane?

  • R-123
  • R-12
  • R-134a
  • R-22

25: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • evaporator
  • outside the machinery room
  • compressor