Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

2: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

3: What is not a requirement of a Class T machine room?

  • Fire hose connected to the building fire protection system.
  • Automatic ventilation
  • Tight fitting doors
  • Self-closing doors

4: What section of ASHRAE-15 governs pressure vessels?

  • Section 6 ASHRAE-34 ASME VIII unfired
  • Section 7 ASHRAE-15 ASME VIII fired
  • OSHA
  • Section 9 ASHRAE-15 ASME VIII unfired

5: A tachometer is an instrument used to measure

  • speed
  • air velocity
  • static pressure
  • RPM

6: Electricity involves the movement of electrons in atoms

  • True
  • False

7: A EPR valve is installed on what type of evaporators?

  • plate evaporators
  • low-temperature evaporators
  • high-temperature evaporators
  • shell and tube evaporators

8: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class T machinery room
  • Class B machinery room
  • Class M machinery room
  • Class A machinery room

9: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • 24 volt secondary side of the Class 2 transformer to the thermostat
  • load-side of the contactor in
  • first disconnect in
  • breaker panel in

10: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

11: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 20 amps
  • There isn't enough information to answer.
  • 24 amps
  • 10 amps

12: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 4%
  • 1%
  • 25%
  • 2%

13: Halo-carbon refrigerants cannot be used with what material?

  • Magnesium alloy
  • Copper
  • Stainless Steel
  • Aluminum

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

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

15: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 455 psig, 185 psig
  • 350 psig, 120 psig

16: A class B2 refrigerant is considered

  • non-toxic and highly flammable
  • toxic and non-flammable
  • toxic and somewhat flammable
  • non-toxic and non-flammable

17: What section governs pressure vessels?

  • Section 8 ASHREA 15 ASME unfired
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA

18: How are safety controls wired in a circuit?

  • Parallel
  • Either series or parallel
  • Series
  • Series/parallel

19: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 75
  • 50
  • 55
  • 15

20: Which creates more of a heat load?

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

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

  • 45
  • 60
  • 38
  • 66

22: The location of a thermal bulb of a TXV affects

  • subcooling
  • the amount of liquid returning to the compressor
  • the amount of liquid in the condenser.
  • the amount of liquid refrigerant in the evaporator

23: A restaurant is classified as a

  • commercial occupancy
  • mixed occupancy
  • large mercantile occupancy
  • public assembly occupancy

24: If your suction line is warmer than the room temperature, this may indicate

  • an over charge
  • plugged air filter
  • below normal superheat
  • a low charge

25: Low pressure systems have what kind of compressor?

  • Rotary
  • Scroll
  • Centrifugal
  • Reciprocating