Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"

2: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • OSHA
  • Section 8 ASHREA 15 ASME unfired

3: On a centrifugal compressor, stationary diffuser vanes are needed to

  • convert velocity energy to pressure
  • increase the clearance space
  • prevent high pressure on the packing
  • stop gas flow

4: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Magnesium alloy
  • Copper
  • Aluminum

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

  • PVC
  • Copper
  • Stainless steel
  • Magnesium alloy

6: Capacitors are rated in

  • megaohms
  • micro-farads
  • volt - amperes
  • kelvins

7: High pressure controls should be set no higher than

  • 10% of set point
  • 80% of set point
  • 25% of set point
  • 90% of set point

8: If the spring is adjusted to increase the superheat, this new setting will

  • have no effect on the frost line
  • shorten the frost line
  • lengthen the frost line
  • allow more liquid into the evaporator

9: What would be the classification of a church?

  • Industrial
  • Large mercantile
  • Institutional
  • Place of assembly

10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • HCFC-123
  • Lithium bromide
  • CFC-11
  • ammonia

11: 1 HP = ____ Watts?

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

12: What is the amp draw of a 40 VA transformer at 24 volts

  • 1.6 amps
  • 1K amps
  • 1,000 amps
  • 106 amps

13: The measurement of heat in a particular substance is

  • enthalpy
  • sensible heat
  • specific heat
  • latent heat

14: Which refrigerant replaced R-12?

  • R-22
  • R-134A
  • R-410A
  • R-407A

15: One atmosphere equals

  • 0 psig
  • 29.4
  • 0 psia
  • 14.7

16: If the power element on an expansion valve should lose its charge, the valve would

  • Close
  • Under feed
  • Over feed
  • Stay open

17: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 50
  • 24
  • 75
  • 100

18: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 120 lbs
  • 55 lbs
  • 65 lbs

19: Increasing superheat will do what to your system?

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

20: What type of oil is used in R-410A systems?

  • mineral oil
  • polyalkylene glycol (PAG)
  • naphthene
  • polyolester (POE)

21: Booster compressors connect to the ____ side of the compressor

  • liquid
  • oil side
  • vapor
  • low side

22: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 70.8 psig
  • 43.3 psig
  • 50.2 psig
  • 66.1 psig

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

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

24: In a motor, an internal overload might open if

  • there's an excess current draw through the motor
  • there's an open start winding
  • there's a direct short
  • there was a high pressure refrigerant was used for a low pressure system.

25: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 9.776 watts
  • 9,776 watts
  • .9776 watts
  • 977.6 watts