Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

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

  • three
  • four
  • five
  • two

3: Control systems can be classified by

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

4: What is considered a cooling agent?

  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat when vaporization occurs
  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat without vaporization

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

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

6: Which occupancy can ammonia be used in?

  • redifential
  • industrial
  • depends on the quantity of freon
  • commercial

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

  • Foot valve
  • Stop valve
  • Muffler
  • Moisture indicator

8: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 100%
  • 80%
  • 75%
  • 90%

9: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • quarterly
  • bi-annually
  • regularly

10: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 5KW
  • 746 watts
  • 600 watts
  • 1000 watts

11: A class B1 refrigerant is considered

  • non-toxic and non-flammable
  • toxic but non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable

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

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

13: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

14: If your suction line is warmer than the room temperature, this may indicate

  • a low charge
  • an over charge
  • plugged air filter
  • below normal superheat

15: A high side float is a

  • float type valve that controls the amount of refrigerant stored in the receiver
  • float type valve that controls the crankcase oil level
  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type switch that stops the compressor when the pressure on the high side becomes too high

16: An electronic bridge circuit is basically a

  • high voltage circuit
  • 24 volt control circuit
  • Wheatstone
  • suspension

17: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will thicken
  • oil level will rise
  • oil will foam

18: In an electrical circuit, what is potential measured in?

  • Herys
  • Volts
  • Amps
  • Ohms

19: How many CFMs are required per square foot of commercial office occupied space

  • 15 CFM
  • .5 CFM
  • 20 CFM
  • 5 CFM

20: Heat transferred by conduction from one body to another is done

  • via liquids
  • via solids
  • via radiation
  • via heat rays

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

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

22: The best way to determine the voltage requirement for an electrical component is to

  • read the nameplate data
  • read the voltage with a mulitmeter
  • check with the utility company
  • determine the capacity of the service panel

23: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

24: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • sensible heat
  • specific heat
  • lost heat
  • latent heat

25: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UV or UR
  • UL and UM
  • UM or UL
  • UL and UR