Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: R-12 is

  • dichlorodifluoromethane
  • trichlorofluoromethane
  • dichloromethane
  • dichlorofluoromethane

3: What measures gas pressure?

  • Manometer
  • Hygrometer
  • Barometer
  • Hydrometer

4: A single pole-double throw switch used how many wires excluding the ground wire?

  • five
  • four
  • two
  • three

5: When should a relief valve start to function?

  • Two times it's working pressure
  • At it's set pressure
  • Before the purge station discharges
  • 10 psi before it's set pressure

6: At higher altitudes, the boiling point of refrigerant is

  • equal to the coefficient of water at 32F
  • lower
  • the same
  • higher

7: A start capacitor is wired in _____ with the start windings.

  • series-parallel
  • junction
  • parallel
  • series

8: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 8'4"
  • 7.25'
  • 7.00'
  • 9.00'

9: Liquid line filter-driers on a 410A system must be rated for no less than

  • 400 psig
  • 600 psig
  • 200 psig
  • 1000 psig

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

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

11: The heat picked up in the evaporator must equal to

  • the heat gained by the condenser
  • the heat giving by the condenser
  • the heat lost by the medium being cooled
  • the heat of compression

12: What is potential measured in?

  • Ohms
  • Volts
  • Amps
  • Henrys

13: What refrigerant doesn't have to be classified?

  • R-134A
  • R-717
  • R-718
  • R-422A

14: Humidity can be sensed with

  • thermometer
  • pressure bellows
  • bimetal
  • human hair

15: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

16: Suction line oil traps should be installed when the condenser is

  • on the third floor roof and the evaporator is in the basement
  • in the basement and the evaporator is on the third floor
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator

17: What is used to check very low pressure?

  • Velometer
  • Hygrometer
  • Hydrometer
  • Manometer

18: What is a Category "D" fluid?

  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperature of over 366F

19: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 1250
  • 2
  • 2.5
  • There isn't enough information to answer.

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

  • 330
  • 1,000
  • 110
  • 6.6

21: An example of an "Expendable Refrigerant" is

  • liquid oxygen
  • liquid nitrogen
  • ammonia
  • lithium bromide

22: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

23: 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

24: Adjusting the spring pressure on a TXV

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

25: Horizontal piping should be run level.

  • Yes, if the condenser is located above the evaporator
  • True
  • No, unless the supervisor on the job says so.
  • False