Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is Absolute Zero?

  • -640F
  • -773F
  • -400F
  • -460F

2: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 550 lbs
  • 330 lbs.
  • 660 lbs

3: A halide torch is most useful with a freon compression system

  • to release a sticking valve
  • to detect refrigeration leaks in piping joints
  • to remove from from TXV's and evaporator coils
  • to sweat flanges on the refrigeration piping

4: How many flammability classifications are refrigerants in?

  • 5
  • 2
  • 7
  • 3

5: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

6: Gauge pressure is

  • what a gauge reads when checking pressures on a chilled water system.
  • absolute pressure
  • force of pressure above that of atmospheric
  • atmospheric pressure

7: Viscosity is

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

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

  • regularly
  • quarterly
  • bi-annually
  • annually

9: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 90
  • 110
  • 100
  • 80

10: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

11: Increasing superheat will do what to your system?

  • Nothing
  • Decrease liquid flow
  • Increase gas flow
  • Increase liquid flow

12: "E" represents _____ in the Watt's law formula.

  • amperage
  • reactance
  • voltage
  • watts

13: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

14: What measures gas pressure?

  • Manometer
  • Hygrometer
  • Barometer
  • Hydrometer

15: What is Trichlorotrifluoromethane?

  • R-13
  • R-113
  • R-11
  • R-12

16: A hotel is considered a _______ occupancy.

  • institutional
  • mercantile
  • residential
  • commercial

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

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

18: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 30'
  • At least 20'
  • There is no minimum for relief valve and windows.
  • At least 40'

19: How many gallons of water per pound of ammonia do you need?

  • 15
  • 5
  • 1
  • 20

20: E = I X R is

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

21: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 45F
  • 155F
  • 158F
  • 32F

22: The first step in mechanical refrigeration is

  • expansion
  • compression
  • evaporation
  • condensation

23: Secondary refrigerants are usually

  • expensive
  • alcohol
  • water or brine
  • Prestone anti-freeze

24: Who authorizes changes to the safety codes?

  • Person who pulled the permit
  • Person in charge of the facility
  • Board of Boilers
  • Contractor who last serviced the system.

25: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 200
  • 12,000
  • 720,000