Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 5
  • 3
  • 2
  • 1

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

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

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

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

4: Large mercantile occupancy is

  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

5: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

6: Which of the following is an example of an azeotropic refrigerant?

  • R-134A
  • R-404A
  • R-410A
  • R-500

7: R-11 belongs to Group

  • B-1
  • A-1
  • B-3
  • A-2

8: Ammonia belongs to Group

  • A-2
  • B-2
  • B-1
  • A-1

9: Volts x amps equals

  • Watts
  • Inductance
  • Ohms Law
  • Impedance

10: RPM's of a centrifugal compressor are at approximately?

  • 15,000
  • 10,000
  • 500
  • 30,000

11: E = I X R is

  • Watts Law
  • Ohms Law
  • Impedance Law
  • Amps Law

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

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

13: The location of a thermal bulb of a TXV affects

  • the amount of liquid refrigerant in the evaporator
  • the amount of liquid in the condenser.
  • subcooling
  • the amount of liquid returning to the compressor

14: What is an example of institutional occupancy?

  • Dorms
  • Football stadium
  • Shopping mall
  • Hospital

15: Gauge pressure is

  • what a gauge reads when checking pressures on a chilled water system.
  • absolute pressure
  • force of pressure above that of atmospheric
  • atmospheric pressure

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

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

17: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UL”
  • “UV”
  • “UM” and “UV”
  • “U” or “UM”

18: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • False
  • True
  • depends on the type of refrigerant being used
  • are obsolete.

19: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection as well as a temperature protection device
  • over pressure protection and a rupture disc
  • over pressure protection
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months

20: Booster compressors, pump refrigerant into the

  • receiver
  • heat & plate heat exchanges
  • high side of the secondary compressor
  • low side of the primary compressor

21: Heat is a form of

  • power
  • work
  • matter
  • energy

22: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

23: How many flammability classifications are refrigerants in?

  • 3
  • 5
  • 2
  • 7

24: No open flames are allowed in the machinery room unless?

  • Only when combustion air is provided from outside of the machinery room
  • Approved by the authorized person
  • Approved by the installing contractor
  • Never can be allowed

25: How many opening forces operate a thermostatic expansion valve?

  • 2
  • 3
  • 1
  • 4