Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What kind of material can't be used on the outlet of a relief valve?

  • Copper
  • Stainless Steel
  • Aluminum
  • PVC

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

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

3: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

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

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

5: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 20 amps
  • 10 amps
  • 5 amps
  • 15 amps

6: The generator shell contains the

  • condenser, the evaporator, and the generator
  • condenser and the absorber
  • evaporator and the absorber
  • condenser and the generator

7: A low oil switch is typically

  • time-delay auto reset
  • manual reset
  • non used on semi-hermetic compressors over 10 ton capacity
  • automatic reset

8: Ammonia vaporization takes place at what temperature?

  • -28F
  • -32F
  • -460F
  • -110F

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

  • run
  • start
  • start capacitor
  • common

10: Before replacing a seized compressor, the _______ should be determinded.

  • current draw
  • type of refrigerant
  • cause of seizure
  • designed head pressure

11: What type of copper is not permitted on refrigeration systems?

  • Type M
  • Type L
  • Type N
  • Type K

12: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

13: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • there is no Group B1 refrigerants
  • the same
  • higher
  • lower

14: Thermodynamics is the branch of science that deals with

  • heat energy
  • molecular therory
  • energy due to motion
  • state of energy

15: How many square inches per square foot?

  • 144
  • 98
  • 64
  • 24

16: How many groups of refrigerants are there?

  • 1
  • 3
  • 7
  • 5

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

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

18: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

19: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • evaporator
  • outside the machinery room
  • compressor

20: Total heat of a substance is considered

  • empathetical
  • enthalpy
  • sensible heat
  • specific heat

21: What is the typical air conditioning operating pressures for R-22?

  • 60 psi suction 210 psi discharge
  • 25 psi suction 125 psi discharge
  • 105 psi suction 340 psi discharge
  • None of the above

22: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

23: 1 Watt = ______ BTU's?

  • 7.216
  • 3.412
  • 12
  • 4.482

24: How much refrigerant can be stored in a mechanical room outside of the system?

  • 100
  • 330
  • 150
  • 200

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

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