Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • ammonia
  • HCFC-123
  • Lithium bromide
  • CFC-11

2: A split-phase motor has a ______ winding and a ____ winding

  • duel-run, duel-start
  • run, common
  • start, common
  • run, start

3: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 977.6 watts
  • 9,776 watts
  • .9776 watts
  • 9.776 watts

4: Low pressure chiller systems use what type of compressor?

  • Reciprocating
  • Screw
  • Scroll
  • Centrifugal

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

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

6: Increasing superheat will do what to your frost line?

  • Nothing
  • Increasae
  • Could either increase or decrease depending on the load conditions
  • Decrease

7: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

8: Horizontal piping should be run level.

  • Yes, if the condenser is located above the evaporator
  • False
  • True
  • No, unless the supervisor on the job says so.

9: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • R-414B
  • Cascade
  • Low pressure
  • Simple

10: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 25
  • 66

11: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Sensible heat
  • Latent heat
  • Enthalpy
  • Specific heat

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

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

13: The color code of a tank of ammonia is

  • white
  • silver
  • light green
  • lavender

14: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • blue
  • orange
  • green
  • red

15: The principle used in continuous type absorption systems is

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

16: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

17: The best way to determine the voltage requirement for an electrical component is to

  • read the nameplate data
  • determine the capacity of the service panel
  • read the voltage with a mulitmeter
  • check with the utility company

18: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

19: The generator shell contains the

  • condenser and the generator
  • condenser and the absorber
  • evaporator and the absorber
  • condenser, the evaporator, and the generator

20: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's water
  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's cheap
  • Because it's a non-flammable refrigerant

21: Class A refrigerants are considered

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

22: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

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

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

24: What is the state of the refrigerant leaving the evaporator?

  • a high temperature subcooled liquid
  • a low temperature subcooled liquid
  • low temperature superheated vapor
  • a high temperature superheated vapor

25: The best way to detect ammonia in brine is

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