Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Which is the lowest vacuum?

  • 1,000 Microns
  • 5 psig
  • 10 psia
  • 5" hg

3: A VRF system is a direct system

  • true
  • false

4: The most common type of motor starter is

  • part winding starter
  • across the line starter
  • duel-winding starter
  • delts-wye starter

5: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the low side
  • the high side
  • the aggregate of the high side and low side
  • 2.5 times the design pressure

6: What is the amp draw of a 40 VA transformer at 24 volts

  • 1.6 amps
  • 106 amps
  • 1,000 amps
  • 1K amps

7: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • release the charge when the pressure exceeds 310 psig or higher
  • receive the pumpdown charge
  • hold up to 110% of the pumpdown charge

8: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • licensed welder
  • competent welder
  • welder qualified
  • licensed technician

9: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

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

  • A-3
  • B-2
  • C-3
  • A-1

11: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

12: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

13: What would be the classification for Stop & Shop grocery store?

  • Large mercantile
  • Industrial
  • Place of assembly
  • Instituional

14: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

15: The principle used in continuous type absorption systems is

  • Ohm's Law
  • Dalton's Law
  • Boyle's Law
  • Charles's Law

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

  • voltage
  • amperage
  • reactance
  • watts

17: A single pole-double throw switch used how many wires excluding the ground wire?

  • four
  • three
  • five
  • two

18: Large mercantile occupancy is

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

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

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

20: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 1000F
  • 600F
  • 800F
  • 700F

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

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

22: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 6.6 lbs
  • 13.9 lbs
  • 44 lbs

23: What instrument is used to measure very high resistance?

  • voltmeter
  • tape measure
  • ammeter
  • meg ohmmeter

24: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

25: Which is considered the more efficient condenser?

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