Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class A machinery room
  • Class T machinery room
  • Class B machinery room
  • Class M machinery room

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

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

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

  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line

4: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • 30F to 50F
  • -100F to -40F
  • -40F to 0F
  • 0F-38F

5: A restaurant is classified as a

  • commercial occupancy
  • public assembly occupancy
  • large mercantile occupancy
  • mixed occupancy

6: 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

7: What is R-22?

  • Chlorofluoromethane
  • HFC
  • Chlorodifluoromethane
  • CCFCM

8: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.

9: A rule of thumb in air conditioning is ____ CFM per ton?

  • 600
  • 100
  • 400
  • 500

10: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 1 week
  • 30 days
  • 2 months
  • 14 days

11: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms

  • 240 volts
  • 2,400 volts
  • 2.40 volts
  • 24.0 volts

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

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

13: How many square inches per square foot?

  • 64
  • 24
  • 98
  • 144

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

  • True
  • False

15: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or more
  • 3 cubic feet or less
  • 15 cubic feet or more
  • 15 square feet or less

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

  • 20
  • 15
  • 5
  • 1

17: Low ambient controls are used when

  • on air conditioning systems only
  • when systems run all year round
  • economizers are used
  • always

18: A start capacitor in series with a start winding will

  • increase the amp draw of the motor
  • decrease the amp draw of the motor
  • increase running efficiency
  • increase starting torque

19: Which creates more of a heat load?

  • 50% RH
  • 30% RH
  • 70% RH
  • 90% RH

20: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

21: How many groups of refrigerants are there?

  • 3
  • 5
  • 1
  • 7

22: A hotel is considered a _______ occupancy.

  • commercial
  • institutional
  • residential
  • mercantile

23: Doors communicating with outside from a mechanical room must be?

  • Steel, approved, weather-stripped
  • Self-closing, aligned, fire door
  • Self-closing, approved, fire door
  • Self-closing, wooden, fire door

24: On a pumpdown system, the liquid-line solenoid is controlled by the

  • defrost timer
  • low pressure switch
  • thermostat
  • low-ambient controller

25: 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.

  • 80
  • 100
  • 90
  • 110