Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A VRF system is a direct system

  • true
  • false

2: Which refrigerant replaced R-12?

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

3: Most CFC's are

  • inert but toxic
  • inert
  • toxic
  • flammable

4: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

5: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

6: Which winding have the most turns?

  • they have equal amount of turns
  • run
  • depends on the motor phase
  • Start

7: Pressure vessels having an inside diameter of 6” or less shall be protected by

  • Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
  • a pressure relief device
  • either a fusible plug or a pressure relief device
  • a fusible plug

8: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

9: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)

  • 77F
  • 70F
  • 32F
  • 58F

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

  • 10
  • 24
  • 18
  • 15

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

  • Stainless steel
  • Copper
  • PVC
  • Magnesium alloy

12: What type of pressure relief device is used on a CO2 system?

  • Gate valve
  • Glove valve
  • Fusible plug
  • Rupture disk

13: A split-phase motor has a ______ winding and a ____ winding

  • run, start
  • run, common
  • duel-run, duel-start
  • start, common

14: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

15: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of low temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of high temperature evaporator
  • outlet of the liquid line

16: 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

17: Control systems can be classified by

  • source of power
  • economy of operation
  • safety
  • tonnage of system

18: The generator shell contains the

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

19: How many closing forces operate a thermostatic expansion valve?

  • 2
  • 1
  • 3
  • 4

20: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

21: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When it's used as part of a supply or return air system
  • When its white
  • When there is a space 6' or more above it
  • When there are sprinklers above

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

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

23: A motor starter contains a thermal overload and a

  • contactor
  • solenoid
  • transformer
  • 3-way relay

24: What is the state of the refrigerant leaving the evaporator?

  • a low temperature subcooled liquid
  • a high temperature superheated vapor
  • low temperature superheated vapor
  • a high temperature subcooled liquid

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

  • 1,000
  • 6.6
  • 330
  • 110