Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Indirect systems using Group II refrigerants

  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used for mechanical equipment only
  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall be used in refrigeration system less than 1,000 lbs

2: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and friction head
  • GPM and unbalanced head and friction head
  • GPM, pipe size, and equivalent head.

3: Can you use Ammonia in industrial applications?

  • When mixed with R-718
  • Yes, Under certain condidtions
  • No, never
  • Yes, always

4: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

5: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 38
  • 88
  • 108

6: Foaming of oil in a compressor is most likely to occur

  • at start-up
  • when the evaporator temperatures are below 32F
  • when ambient temperature are low
  • when there is insufficient air across the condenser(i.e., dirty coil)

7: When can 50/50 solder be used?

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

8: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

9: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Enthalpy
  • Specific heat
  • Sensible heat
  • Latent heat

10: Volts x amps equals

  • Inductance
  • Impedance
  • Ohms Law
  • Watts

11: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?

  • 506v
  • 550v
  • 660v
  • None of the above

12: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • bi-annually
  • regularly
  • quarterly

13: The density of a gas refers to

  • cubic feet per pound
  • pounds per absolute pressure
  • pounds per cubic foot
  • pounds per square foot

14: Pi equals approximately

  • 3.41
  • 3.14
  • 746
  • 12,000

15: Transformers are rated in

  • amps
  • volt-amps
  • volts-ohms
  • volts

16: The oil separator is always inserted in the system

  • to prevent oil logging
  • where it can be easily serviced
  • in the discharge line
  • in a cool spot

17: E = I X R is

  • Ohms Law
  • Watts Law
  • Impedance Law
  • Amps Law

18: 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

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

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

20: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • III
  • 15
  • 25
  • 10

21: The most common type of motor starter is

  • duel-winding starter
  • delts-wye starter
  • across the line starter
  • part winding starter

22: What must be done if refrigeration lines pass through a concrete floor?

  • moisture barrier
  • leak checked
  • insulated
  • installed through a pipe casing

23: Thermodynamics is the branch of science that deals with

  • energy due to motion
  • heat energy
  • molecular therory
  • state of energy

24: Three-phase motors have what type of windings?

  • one start winding and one run winding.
  • three start windings
  • three run windings and 3 start windings
  • three run windings

25: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator