Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Class A refrigerants are considered

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

2: What must be done to refrigerant pipes before being buried?

  • Leaked checked
  • Encased
  • Coated
  • Certified

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

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

4: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms

  • 240 volts
  • 2.40 volts
  • 2,400 volts
  • 24.0 volts

5: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Exterior scale formation is minimized
  • Discoloration is prevented
  • Copper oxide formation is prevented

6: What happens after your initial inspection of a pressure vessel?

  • Notify the Fire Marshal that the system has been inspected and approved
  • There is a temporary shut-down until a final inspection can be performed.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the AHJ to let them know that the system been inspected

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

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

8: Doors communicating with outside from a mechanical room must be?

  • Steel, approved, weather-stripped
  • Self-closing, approved, fire door
  • Self-closing, aligned, fire door
  • Self-closing, wooden, fire door

9: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When its white
  • When there are sprinklers above
  • When there is a space 6' or more above it
  • When it's used as part of a supply or return air system

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

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

11: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • purge
  • surge
  • splurge
  • merge

12: The External equalizer of a TXV compensates for

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

13: What is potential measured in?

  • Amps
  • Volts
  • Henrys
  • Ohms

14: A High-Probablity system

  • is a system highly likely to leak from a failed connection or component of such system
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area

15: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)

  • Pressure gauge
  • Temperature gauge
  • Sight glass gauge
  • All of the above

16: What is not a requirement of a class T machine room?

  • tight fitting doors
  • fire hose connection to the building fire protection system
  • automatic ventilation
  • self-closing doors

17: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • 20 amps
  • There isn't enough information to answer.
  • 24 amps
  • 10 amps

18: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?

  • 71 ohms
  • 27 ohms
  • 104 ohms
  • 80 ohms

19: Where is the high-side float located on a chiller system?

  • inside the chiller barrel
  • flash line
  • discharge line
  • liquid line

20: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

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

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

22: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • refrigerant control
  • capacity control

23: Low pressure systems have what kind of compressor?

  • Rotary
  • Scroll
  • Centrifugal
  • Reciprocating

24: The density of a gas refers to

  • pounds per absolute pressure
  • cubic feet per pound
  • pounds per cubic foot
  • pounds per square foot

25: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b