Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A micron is

  • a larger unit of measurement than Hg
  • one millonths of a centimeter
  • one thousandths of a millimeter
  • one millonths of a micrometer

2: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

3: While the system is operating, the discharge line should be

  • at the same temperature as the crankcase
  • 10-15F warmer than ambient
  • too hot to hold by hand
  • room temperature

4: What section governs pressure vessels?

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

5: What is the state of the refrigerant leaving the evaporator?

  • a high temperature superheated vapor
  • a high temperature subcooled liquid
  • a low temperature subcooled liquid
  • low temperature superheated vapor

6: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

7: At higher altitudes, the boiling point of refrigerant is

  • lower
  • equal to the coefficient of water at 32F
  • higher
  • the same

8: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When its white
  • When it's used as part of a supply or return air system
  • When there are sprinklers above
  • When there is a space 6' or more above it

9: On a pumpdown system, the liquid-line solenoid is controlled by the

  • thermostat
  • low-ambient controller
  • low pressure switch
  • defrost timer

10: Ammonia belongs to Group

  • B-1
  • A-1
  • B-2
  • A-2

11: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 350
  • 250
  • 400
  • 100

12: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Suction and discharge valves
  • Rotating vanes
  • Fan-like action
  • Nesting scrolls

13: What device should be used on low-temperature freezers?

  • hot-gas by-pass
  • oil separator
  • discharge muffler
  • high capacity TXV

14: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 34.15
  • 6.830
  • 16.64
  • 3.415

15: Adjusting the spring pressure on a TXV

  • makes no difference
  • changes subcooling
  • changes superheat
  • adjusts the bulb charge

16: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 5
  • 3
  • 2
  • 4

17: The reversing valve is commonly used

  • on commercial system that involve two different temperatures
  • on all heat pumps
  • on multiple compressor systems
  • when the code requires a check valve

18: Humidity can be sensed with

  • human hair
  • bimetal
  • pressure bellows
  • thermometer

19: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

20: 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

21: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Positive displacement
  • Pressure induced displacement.
  • Non-positive displacement
  • Low Pressure displacement

22: What refrigerant is an inorganic compound?

  • Ammonia
  • R-22
  • R-410A
  • R-132A

23: Trichlorofluoromethane is the name of what refrigerant?

  • R-12
  • R-113
  • R-502
  • R-11

24: What is the purpose of a surge capacitor on a contactor?

  • to protect low voltage equipment
  • to keep the contactor pulled in
  • to balance the sine waves
  • to provide smoother start/stops

25: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above