Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 200
  • 12,000
  • 720,000

2: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 18
  • 48
  • 24
  • 36

3: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 70.8 psig
  • 66.1 psig
  • 50.2 psig
  • 43.3 psig

4: 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

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

5: Gauge pressure is

  • Absolute pressrue
  • Atmospheric pressure
  • Force of pressure above that of atmosphere
  • Barometric pressure

6: Low ambient controls are used when

  • always
  • when systems run all year round
  • on air conditioning systems only
  • economizers are used

7: What is a Category "M" fluid?

  • Any fluid that exceeds 150 psig and has design temperatures over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
  • A typical refrigerant used on newer air conditioning and heat pump systems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F

8: The main purpose of the accumulator is to

  • prevent liquid slugs at the compressor
  • provide space for the accumulation of oil and containminants
  • store liquid refrigerant
  • provide space for vapor to accumulate

9: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

10: How many flammability classifications are refrigerants in?

  • 2
  • 5
  • 7
  • 3

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

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

12: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Low pressure
  • Cascade
  • R-414B
  • Simple

13: The External equalizer of a TXV compensates for

  • pressure within the evaporator
  • pressure within the system
  • pressure drop across the condenser coil
  • pressure drop across the evaporator coil

14: What type refrigerant is NOT ozone depleting?

  • HCFC
  • CFC
  • HFC
  • Halon

15: "R" represents ___ in the Ohm's law formula

  • resistance
  • amperage
  • capacitance
  • voltage

16: Who authorizes changes to the safety codes?

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

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

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

18: Name an HCFC refrigerant(s):

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

19: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 18
  • 24
  • 10
  • 15

20: When the compressor is below the condensor

  • traps are needed on the discharge line
  • traps are needed on the suction line
  • traps are needed on the oil return line
  • traps are not needed on this type of system

21: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • series
  • parallel
  • junction

22: How many closing forces operate a thermostatic expansion valve?

  • 4
  • 2
  • 1
  • 3

23: How are safety controls wired in a circuit?

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

24: Which refrigerant is lighter than air?

  • R-11
  • R-134a
  • R-717
  • R-123

25: Which creates more of a heat load?

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