Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When energized, a normally open relay will be

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

2: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • commercial occupancy
  • institutional occupancy
  • mixed occupancy
  • public assembly occupancy

3: Copper and its alloys shall not be used with ammonia

  • True
  • False

4: When an inspection is needed, how often must it be done?

  • every 36 months
  • every 24 months
  • annually
  • every 18 months

5: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 75%
  • 80%
  • 90%
  • 100%

6: The main purpose of the accumulator is to

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

7: Ohm's Law indicates Amps X Resistance = ___________.

  • Volts
  • Impedance
  • Current
  • Ohms

8: E = I X R is

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

9: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

10: The formula for Pure Power in a resistance circuit is

  • Watts X power factor
  • Kw = volts X amps
  • Watts X amps.
  • Watts = volts X amps

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

  • business
  • public assembly
  • commercial
  • mercantile

12: Secondary refrigerants are usually

  • Prestone anti-freeze
  • expensive
  • water or brine
  • alcohol

13: A start capacitor in series with a start winding will

  • increase starting torque
  • increase running efficiency
  • decrease the amp draw of the motor
  • increase the amp draw of the motor

14: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • latent heat
  • sensible heat
  • lost heat
  • specific heat

15: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UR
  • UV or UR
  • UM or UL
  • UL and UM

16: Fractionation occurs when

  • when a fraction of refrigerant is added as the full charge
  • the pressures increase as the heat load increases
  • the pressures decreases as the heat load decreases
  • some of the blended refrigerant evaporates or condenses before the rest of the blend

17: The difference between saturated liquid and saturated vapor is

  • heat
  • pressure
  • volume
  • temperature

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

  • 50
  • 22
  • 25
  • 66

19: A single pole-double throw switch uses how many wires?(excluding the ground)

  • 4
  • 3
  • 5
  • 2

20: R-22 is considered a(n)

  • HFC
  • HCFCH
  • CFC
  • HCFC

21: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

22: The most common type of motor starter is

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

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

  • 120v
  • 208v
  • 277v
  • 240v

24: 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
  • CFC-11
  • Lithium bromide

25: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above