Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What's the purpose of a megahmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

2: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

3: 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

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

4: When energized, a normally open relay will be

  • closed
  • noisy
  • depends on the type and class of the relay
  • open

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

  • 36'
  • 25'
  • 15'
  • 10'

6: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 22
  • 18
  • 33
  • 50

7: 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
  • lift voltage
  • pick-up voltage
  • run voltage

8: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

9: Where a refrigeration or air conditioning system is installed,

  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • A field inspection shall be made before it is put into service
  • the form or certificate shall be authorized by the Department of Public Safety
  • it shall not be operated below prescribed pressuers

10: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

11: 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.

12: Pressure is the equivalent of

  • area times force
  • force times area
  • force
  • force per unit area

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

  • resistance
  • voltage
  • amperage
  • capacitance

14: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

15: What is the refrigerant dichlorodifluoromethane?

  • R-12
  • R-123
  • R-22
  • R-134A

16: A capacitor in series with the start windings will do what?

  • Increase run efficiency by 10% of its rating
  • Nothing
  • Increase starting torque
  • Decrease the RLA to within 10% of its rating

17: What refrigerant were phased out in 2004?

  • R-22
  • R-134a
  • R-12
  • R-11

18: A split-phase motor has a ______ winding and a ____ winding

  • run, common
  • run, start
  • start, common
  • duel-run, duel-start

19: Name an HCFC refrigerant(s):

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

20: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 10 amps
  • 15 amps
  • 5 amps
  • 20 amps

21: B3 refrigerants are considered

  • non-toxic but non-flammable
  • toxic but non-flammable
  • toxic and highly flammable
  • non-toxic but flammable

22: A declaration test is needed when the system contains more than

  • 65 lbs
  • 120 lbs
  • 110 lbs
  • 55 lbs

23: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Isothermal
  • Pressure Temperature
  • Adiabatic

24: R-123 belongs to Group

  • A-3
  • B-1
  • B-3
  • B-2

25: If the power element of an expansion valve should lose its charge the valve would

  • go closed
  • underfeed the evaporator
  • overfeed the evaporator
  • go open