Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Give an example of a secondary coolant?

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

2: An air conditioning system rated for 36,000 BTU's is equivalent to

  • three tons of cooling
  • two tons of cooling
  • one ton of cooling
  • 12,000 tons of cooling

3: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

4: Lithium-bromide, Li-Br, is best characterized as a

  • salt
  • sand
  • soil
  • sugar

5: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 125 psig
  • 327 psig
  • 365 psig
  • 255 psig

6: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Muffler
  • Moisture indicator
  • Foot valve

7: A tachometer is an instrument used to measure

  • RPM
  • static pressure
  • speed
  • air velocity

8: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 800F
  • 600F
  • 1000F
  • 700F

9: R-11 belongs to Group

  • B-3
  • B-1
  • A-1
  • A-2

10: Start to Run windings will have what resistance?

  • All will be at equal values
  • The least resistance value
  • Somewhere between the actual start winding and run winding resistance value
  • The most resistance value

11: What type refrigerant is NOT ozone depleting?

  • CFC
  • Halon
  • HCFC
  • HFC

12: The reversing valve is commonly used

  • when the code requires a check valve
  • on commercial system that involve two different temperatures
  • on multiple compressor systems
  • on all heat pumps

13: Which of the following is an example of an azeotropic refrigerant?

  • R-500
  • R-404A
  • R-410A
  • R-134A

14: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.5
  • 1
  • 1.2
  • 2.2

15: Which creates more of a heat load?

  • 30% RH
  • 70% RH
  • 50% RH
  • 90% RH

16: The Board of Boilers adopts by reference

  • MSCA Code
  • Montreal Protocol Safety Code
  • the MACS Pressure Vessel Code of Massachusetts
  • the 1997 ANSI/ASHRAE Safety Code

17: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

18: The best way to detect ammonia in brine is

  • potassium of line
  • carbonation of soda
  • CO2 gas
  • nessler regaent

19: R-22 falls under which safety classification?

  • B-1
  • B-2
  • A-2
  • A-1

20: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

21: What is the state of the refrigerant leaving the evaporator?

  • a high temperature subcooled liquid
  • low temperature superheated vapor
  • a low temperature subcooled liquid
  • a high temperature superheated vapor

22: Which of the following is NOT a positive displacement compressor?

  • reciprocating
  • scroll
  • centrifugal
  • screw

23: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the return air ducted system
  • the mechanical room housing the refrigeration system
  • Machinery rooms need not be vented
  • the outdoors

24: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's a non-flammable refrigerant
  • Because it's water
  • Because it's cheap
  • R-718 is not rated unlimited because it's a dangerous refrigerant

25: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • Psychrometer
  • hydrometer
  • anemometer
  • refractometer