Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

2: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

3: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

4: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

5: In a motor, an internal overload might open if

  • there's an open start winding
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's a direct short
  • there's an excess current draw through the motor

6: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • strong solution
  • concentrated solution
  • weak solution
  • absorbed solution

7: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • do not need pressure relief protection

8: What does an anemometer measure?

  • voltage
  • temperature
  • velocity
  • amperage

9: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

10: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

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

  • series
  • parallel
  • series-parallel
  • junction

12: Which refrigerant class listed below is the most flammable?

  • A-1
  • A-3
  • C-3
  • B-2

13: The certificate of inspection

  • shall be posted and protected from dirt, water, and other elements
  • shall be authorized by a notarized insurance company
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted on the compressor shell or electrical panel at the unit

14: Low pressure systems have what kind of compressor?

  • Scroll
  • Reciprocating
  • Centrifugal
  • Rotary

15: 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

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

16: Refrigerant restricted in 2004 but used for transition for decades:

  • R-22
  • R-11
  • R-134A
  • R-123

17: R-11 has the greatest corrosive effect on

  • Copper
  • Aluminum
  • Magnesium
  • Bronze

18: Who approves containers for refrigerants?

  • D.O.E
  • D.O.D
  • D.O.T
  • E.P.A

19: What type of material can't be used on the outlet of a relief valve?

  • Stainless steel
  • PVC
  • Magnesium alloy
  • Copper

20: 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

21: 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

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

22: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 38
  • 58
  • 88
  • 96

23: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • moisture in the system
  • not enough oil in the system
  • oil in evaporator
  • low head pressure

24: A single pole-double throw switch used how many wires excluding the ground wire?

  • two
  • five
  • three
  • four

25: Electricity involves the movement of electrons in atoms

  • True
  • False