Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Class A refrigerants are considered

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

3: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of vaporization
  • water sprayed over condenser
  • passing thru the tubes from top to bottom
  • removing the latent heat of fusion

4: Where are the three places that the discharge from an ammonia relief valve be piped?

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

5: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • filter out impurities from the system
  • store excess refrigerant from the reciver
  • reduce friction loss to the flow of refrigerant

6: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated
  • is a self-contained complete factory made and tested system

7: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe as you would measure it
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it plus 25% for fittigns

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

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

9: Which refrigerant class listed below is the most flammable?

  • B2
  • A3
  • C3
  • A2

10: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • shall be prohibited
  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall not be prohibited
  • of Group B2 refrigerant shall be prohibited

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

  • 6.6
  • 330
  • 110
  • 1,000

12: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 9.776 watts
  • 977.6 watts
  • 9,776 watts
  • .9776 watts

13: Where a refrigeration or air conditioning system is installed,

  • it shall not be operated below prescribed pressuers
  • the form or certificate shall be authorized by the Department of Public Safety
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • A field inspection shall be made before it is put into service

14: Brazed joints melt at temperatures above

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

15: On a single phase motor, when does the start winding cut out?

  • 25% of its RLA speed
  • 100% of its RLA speed
  • 75% of its RLA speed
  • 50% of its RLA speed

16: Electricity involves the movement of electrons in atoms

  • True
  • False

17: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1
  • 1.2
  • 2.2
  • 1.5

18: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 350 psig, 120 psig
  • 455 psig, 185 psig

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

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

20: How many refrigerant classifications are there for toxicity?

  • 1
  • 3
  • 5
  • 2

21: 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

22: The reversing valve is commonly used

  • on multiple compressor systems
  • on commercial system that involve two different temperatures
  • when the code requires a check valve
  • on all heat pumps

23: R-11 has the greatest corrosive effect on

  • Aluminum
  • Magnesium
  • Bronze
  • Copper

24: Adjusting the spring pressure on a TXV

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

25: The proper location for an oil separator is between the

  • compressor and condenser
  • receiver and metering device
  • evaporator and compressor
  • condenser and receiver