Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • ammeter
  • voltmeter
  • meg ohmmeter
  • tape measure

2: What type of relief valve is used on a CO2 system?

  • gate valve
  • glove disc
  • rupture disc
  • fusible plug

3: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • annually
  • bi-annually
  • regularly
  • quarterly

4: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 277v
  • 120v
  • 240v
  • 208v

5: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

6: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

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

  • 330
  • 1,000
  • 6.6
  • 110

8: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 Kelvin
  • 1 BTU
  • 1 Therm
  • The rate of conduction

9: 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”
  • “UM” and “UV”
  • “U” or “UM”
  • “UV”

10: The best way to detect ammonia in brine is

  • CO2 gas
  • potassium of line
  • nessler regaent
  • carbonation of soda

11: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 120 lbs
  • 55 lbs
  • 65 lbs

12: A solder joint melts at temperatures of

  • 600F to 900F
  • 1,200F to 1,500F
  • less than 400F
  • 400F to 800F

13: A class B1 refrigerant is considered

  • toxic but non-flammable
  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable

14: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above

15: A mixed occupancy occurs when two or more occupancies are located with the same building

  • true
  • false

16: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 18
  • 10
  • 15
  • 24

17: How many CFMs are required per square foot of commercial office occupied space

  • 15 CFM
  • 20 CFM
  • 5 CFM
  • .5 CFM

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

  • 1
  • 1.5
  • 1.2
  • 2.2

19: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?

  • Flush with RX-11
  • Flush with ammonia
  • Flush with R-11
  • Flush with R-718

20: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

21: A professional or office building would be considered what type of occupancy?

  • commercial
  • business
  • public assembly
  • mercantile

22: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more diluted
  • The Li-Br solution will become more concentrated
  • System operating pressure will drop
  • Rust can form

23: How much refrigerant can be stored in a mechanical room outside of the system?

  • 200
  • 100
  • 330
  • 150

24: A run capacitor is wired in series with the _____ windings.

  • start
  • run
  • start capacitor
  • common

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

  • 155F
  • 32F
  • 45F
  • 158F