Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How many refrigerant classifications are there for toxicity?

  • 1
  • 5
  • 2
  • 3

2: What is the maximum voltage range allowed on an electrical circuit?

  • 5%
  • 10%
  • 20%
  • 15%

3: Excessive head pressure is often caused by

  • leaking reed valve on the discharge side
  • thermostat set too high
  • air cooled condenser is plugged
  • insufficient refrigerant

4: 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 an excess current draw through the motor
  • there's a direct short

5: What type refrigerant is NOT ozone depleting?

  • CFC
  • HFC
  • HCFC
  • Halon

6: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 40% Li-Br, 60% distilled water
  • 40% Li-Br, 60% tap water
  • 60% Li-Br, 40% distilled water
  • 50% Li-Br, 50% tap water

7: Ammonia (NH3) is a group III refrigerant

  • True
  • False

8: Heat is a form of

  • matter
  • work
  • energy
  • power

9: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Stop valve
  • Muffler
  • Moisture indicator
  • Foot valve

10: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 3
  • 5
  • 1
  • 2

11: 1 Watt = ______ BTU's?

  • 7.216
  • 12
  • 4.482
  • 3.412

12: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 75%
  • 80%
  • 90%
  • 100%

13: A run capacitor is wired in series with the _____ windings.

  • common
  • start capacitor
  • run
  • start

14: Booster compressors connect to the ____ side of the compressor

  • low side
  • liquid
  • vapor
  • oil side

15: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 100
  • 50
  • 24
  • 75

16: The density of a gas refers to

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

17: An example of an "Expendable Refrigerant" is

  • liquid oxygen
  • liquid nitrogen
  • lithium bromide
  • ammonia

18: What section of ASHRAE-15 governs pressure vessels?

  • Section 6 ASHRAE-34 ASME VIII unfired
  • Section 9 ASHRAE-15 ASME VIII unfired
  • Section 7 ASHRAE-15 ASME VIII fired
  • OSHA

19: A motor starter contains a thermal overload and a

  • transformer
  • 3-way relay
  • contactor
  • solenoid

20: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 6.6 lbs
  • 44 lbs
  • 13.9 lbs
  • 22 lbs

21: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat lost by the medium being cooled
  • the heat gained by the condenser
  • the heat of compression

22: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • Machinery rooms need not be vented
  • the return air ducted system
  • the outdoors
  • the mechanical room housing the refrigeration system

23: Capacity control on a centrifugal compressor is accomplished by the

  • slide vanes
  • check valves
  • post-rotational guide vanes
  • pre-rotational guide vanes

24: How many opening forces operate a thermostatic expansion valve?

  • 3
  • 2
  • 1
  • 4

25: 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
  • 96
  • 58
  • 88