Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • sight glass, weight, pressure, and frost line

3: How many gallons of water do you need per pound of ammonia?

  • 50
  • 100
  • 10
  • 1

4: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 14 AWG
  • 12 AWG

5: "P" represents ______ in the Watt's law formula

  • amperage
  • watts
  • voltage
  • reactance

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

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

7: How many volts would you read on a 480V system phase to phase?

  • 1/3 the voltage
  • 0
  • 480
  • 277

8: _____ and its alloys are suitable for use with ammonia systems.

  • Zinc
  • Aluminum
  • Copper
  • Magnesium

9: 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

10: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

11: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump
  • remain in the air

12: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

13: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the comrpessor
  • reset the safety valve
  • reset the expansion valve
  • start the fan and circulating pump

14: Brazed joints melt at temperatures above

  • 1,000F
  • 500F
  • 1,200F
  • 800F

15: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

16: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 21F
  • 9F
  • 29F
  • 11F

17: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 25
  • 22
  • 66

18: 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

19: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Saturated temperature
  • Critical temperature
  • Wet bulb temperature
  • Dry bulb temperature

20: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 1/8"
  • 1/16"
  • 3/32"

21: Capacity control on an absorption system is typically accomplished by varying the

  • speed of the chilled water circulatory pump
  • speed of the condenser water circulator pump
  • rate at which heat is supplied to the generator
  • pressure setting on the system's rupture disc

22: 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

23: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

24: Ammonia (NH3) is a group III refrigerant

  • True
  • False

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

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