Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: How many refrigerant classifications are there for toxicity?

  • 2
  • 3
  • 5
  • 1

2: A start capacitor is wired in _____ with the start windings.

  • parallel
  • junction
  • series-parallel
  • series

3: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • concentrated solution
  • absorbed solution
  • weak solution
  • strong solution

4: Who approves containers for refrigerants?

  • E.P.A
  • D.O.D
  • D.O.T
  • D.O.E

5: Excessive head pressure is often caused by

  • insufficient refrigerant
  • leaking reed valve on the discharge side
  • thermostat set too high
  • air cooled condenser is plugged

6: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 45F
  • 155F
  • 32F
  • 158F

7: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?

  • Oil
  • Air
  • Electricity
  • Heat

8: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

9: 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

10: Suction line oil traps should be installed when the condenser is

  • in the basement and the evaporator is on the third floor
  • more than 100' away from the evaporator
  • located outside the operates in temperatures below 35F
  • on the third floor roof and the evaporator is in the basement

11: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-22
  • R-12
  • R-113
  • R-11

12: Who authorizes changes to the safety codes?

  • Board of Boilers
  • Contractor who last serviced the system.
  • Person who pulled the permit
  • Person in charge of the facility

13: 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

14: The main purpose of the accumulator is to

  • provide space for vapor to accumulate
  • provide space for the accumulation of oil and containminants
  • prevent liquid slugs at the compressor
  • store liquid refrigerant

15: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • line voltage t-stat
  • immersion controller
  • low voltage t-stat
  • aquastat

16: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

17: If two 500 ohm resistors are connected in series, the resistance will be

  • 1000 ohms
  • 200 ohms
  • 20 ohms
  • 500 ohms

18: Which is considered the more efficient condenser?

  • spray cooled
  • water cooled
  • fan cooled
  • air cooled

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

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

20: When should a relief valve start to function?

  • 10 psi before it's set pressure
  • Before the purge station discharges
  • At it's set pressure
  • Two times it's working pressure

21: When energized, a normally open relay will be

  • open
  • depends on the type and class of the relay
  • noisy
  • closed

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

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

23: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

24: The Department that certifies the transportation of refrigerant is the

  • EPA
  • DOT
  • EPO
  • RSES

25: A pressure relief should be located at least _______ from windows and doors.

  • 25'
  • 30'
  • 20'
  • 15'