Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A micron is

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

2: A class B2 refrigerant is considered

  • toxic and non-flammable
  • toxic and somewhat flammable
  • non-toxic and highly flammable
  • non-toxic and non-flammable

3: What is used to check very low air pressures in air conditioning duct?

  • Barometer
  • Anemomter
  • Vacuum gauge
  • Manometer

4: A class A3 refrigerant is considered

  • toxic and non-flammable
  • toxic and somewhat flammable
  • non-toxic and non-flammable
  • non-toxic but highly flammable

5: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

6: When an inspection is needed, how often must it be done?

  • every 18 months
  • annually
  • every 24 months
  • every 36 months

7: Which occupancy can ammonia be used in?

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

8: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • .8
  • 1.2
  • 1.7
  • .1

9: What is an egress?

  • A valve put on the low side of the system to prevent frosting
  • A code violation
  • An entrance or exit
  • An escape route

10: Gauge pressure is

  • Barometric pressure
  • Force of pressure above that of atmosphere
  • Absolute pressrue
  • Atmospheric pressure

11: A class B1 refrigerant is considered

  • non-toxic but highly flammable
  • non-toxic and non-flammable
  • toxic but non-flammable
  • toxic and somewhat flammable

12: The density of a gas refers to

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

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

  • 4%
  • 1%
  • 25%
  • 2%

14: R-22 is considered a(n)

  • CFC
  • HFC
  • HCFC
  • HCFCH

15: Oils, classified as to source, are

  • animal, vegetable, and mineral
  • animal, vegetable, and castor
  • naphthalene, paraffin, and castor
  • naphthalene, mixed, and paraffin

16: Direct systems using Group II refrigerants

  • shall be installed per instruction of the AHJ
  • shall be installed in Class T machinery rooms
  • shall be allowed to be used for human comfort.
  • shall not be used for air condition for human comfort

17: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 48
  • 36
  • 18
  • 24

18: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

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

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

20: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

21: Ammonia vaporization takes place at what temperature?

  • -32F
  • -110F
  • -28F
  • -460F

22: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • increases
  • decreases
  • run as designed with low ambient controls
  • doesn't change

23: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 25
  • 66

24: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • mixed occupancy
  • public assembly occupancy
  • commercial occupancy
  • institutional occupancy

25: In designing duct work, pressure and ______ need to be considered

  • length
  • CFM
  • duct sealant used
  • all of the above