Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which occupancy can ammonia be used in?

  • industrial
  • depends on the quantity of freon
  • commercial
  • redifential

2: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Electricity
  • Oil
  • Heat
  • Air

3: Increasing superheat will do what to your frost line?

  • Could either increase or decrease depending on the load conditions
  • Decrease
  • Nothing
  • Increasae

4: Viscosity is

  • the coefficient of external friction
  • a measure of heat content
  • the ability of oil to flow
  • measure of weight

5: What device measures the specific gravity of a substance?

  • Hygrometer
  • Manometer
  • Thermometer
  • Hydrometer

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

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

7: How many forces operate a thermostatic expansion valve?

  • 4
  • 3
  • 1
  • 2

8: What refrigerant doesn't have to be classified?

  • R-718
  • R-134A
  • R-422A
  • R-717

9: Clearance volume

  • affects compressor capacity
  • has no effect on compressor capacity
  • varies depending on compressor speed
  • is the same on all compressors

10: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Classifed
  • Insulated and installed in a pipe duct (Encased)
  • Certified

11: Pipe identification labels are required when the system contains more than

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

12: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 71 ohms
  • 80 ohms
  • 27 ohms
  • 104 ohms

13: Where is an EPR valve located on a multi-evaporator system?

  • Suction line of the warmest evaporator
  • Suction line of the coolest evaporator
  • Suction line at the compressor
  • Suction line prior to the accumulator of the lowest temperature system

14: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • red
  • green
  • blue
  • orange

15: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 1%
  • 4%
  • 2%
  • 25%

16: How many refrigerant classifications are there for toxicity?

  • 5
  • 2
  • 1
  • 3

17: A mercury bulb controller is not recommended for

  • line or low voltage use
  • low voltage use
  • use where vibration is severe
  • line voltage use

18: Liquid level gauges must be provided with what?

  • A relief valve
  • A red line
  • A low level mark
  • Automatic shut-offs

19: What is R-22?

  • Chlorodifluoromethane
  • Chlorofluoromethane
  • HFC
  • CCFCM

20: Which of the following is an example of an azeotropic refrigerant?

  • R-134A
  • R-404A
  • R-410A
  • R-500

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

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

22: What is not a requirement of a class T machine room?

  • fire hose connection to the building fire protection system
  • self-closing doors
  • tight fitting doors
  • automatic ventilation

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

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

24: What is the boiling point of refrigerant governed by?

  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling
  • Compressor RPM's

25: Heat is a form of

  • matter
  • work
  • power
  • energy