Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the minimum height refrigeration piping should be placed against walls?

  • 6'
  • 72"
  • 7.25'
  • Ceiling height

2: What measures gas pressure?

  • Hydrometer
  • Hygrometer
  • Barometer
  • Manometer

3: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • does not require a pressure-limiting device
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device installed on the high side of the system
  • shall have a pressure limiting device and a pressure relief valve installed

4: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

5: Humidity can be sensed with

  • human hair
  • thermometer
  • pressure bellows
  • bimetal

6: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

7: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or more

8: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 38
  • 58
  • 88
  • 96

9: Stop valves shall not be permitted between the system and the

  • condenser
  • service valve
  • bleed valve
  • relief valve

10: Which refrigerant replaced R-12?

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

11: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • release the charge when the pressure exceeds 310 psig or higher
  • receive the pumpdown charge
  • hold up to 110% of the pumpdown charge

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

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

13: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • high pressure
  • low pressure
  • critical pressure
  • design pressure

14: Class A refrigerants are considered

  • non-toxic
  • non-flammable
  • flammable
  • toxic

15: Who approves containers for refrigerants?

  • D.O.T
  • D.O.E
  • E.P.A
  • D.O.D

16: A EPR valve is installed on what type of evaporators?

  • plate evaporators
  • high-temperature evaporators
  • low-temperature evaporators
  • shell and tube evaporators

17: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Muffler
  • Foot valve
  • Stop valve
  • Moisture indicator

18: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 40'
  • There is no minimum for relief valve and windows.
  • At least 30'
  • At least 20'

19: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Air
  • Heat
  • Electricity
  • Oil

20: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 255 psig
  • 365 psig
  • 327 psig
  • 125 psig

21: A self contained system

  • is any system or part of a system used to increase evaporation by expansion or vaporization
  • is a unit system Group II refrigerants only
  • is a complete factory made and tested system
  • is a unit system Group I refrigerants only

22: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

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

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

24: The External equalizer of a TXV compensates for

  • pressure drop across the evaporator coil
  • pressure within the system
  • pressure within the evaporator
  • pressure drop across the condenser coil

25: Pressure is the equivalent of

  • area times force
  • force times area
  • force per unit area
  • force