Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 1 HP = ____ Watts?

  • 3,412
  • 3.1416
  • 746
  • 11,239

2: A high side float is a

  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the crankcase oil level
  • float type valve that controls the amount of refrigerant stored in the receiver

3: A relief valve discharge capacity is rated in

  • PSIA
  • PSIG
  • temperature minus pounds of air per second divided by release rate squared
  • Pounds of air per minute.

4: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • you can't change refrigerants
  • make sure it's compatible, notify owner, notify A.H.J
  • nothing must be done
  • place sign, check for leaks, insulate

5: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

6: Secondary refrigerants are usually

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

7: How is bring measured?

  • hygrometer
  • hydrometer
  • manometer
  • anemometer

8: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere

  • 110
  • 330
  • 6.6
  • 1,000

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

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

10: Which of the following is NOT a positive displacement compressor?

  • reciprocating
  • scroll
  • centrifugal
  • screw

11: Adjusting the spring pressure on a TXV

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

12: E = I X R is

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

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

  • 1
  • 4
  • 2
  • 3

14: 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.

15: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • R-718
  • methyl chloride
  • trichlorotrifluoromethane
  • ammonia

16: R-11 belongs to Group

  • B-3
  • B-1
  • A-1
  • A-2

17: The difference between saturated liquid and saturated vapor is

  • volume
  • temperature
  • heat
  • pressure

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

  • 36
  • 48
  • 18
  • 24

19: 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

20: Ammonia vaporization takes place at what temperature?

  • -110F
  • -32F
  • -28F
  • -460F

21: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

22: The density of a gas refers to

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

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

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

24: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • True
  • depends on the type of refrigerant being used
  • are obsolete.
  • False

25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 18
  • 24
  • 15
  • 10