Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: What are the three components of a transformer?

  • Primary core, secondary coil, and high and low voltage connectors.
  • Contacts, secondary coil, and core
  • Primary coil, secondary coil, and core
  • Primary coil, secondary coil, and copper contacts

3: Viscosity is

  • the coefficient of external friction
  • a measure of heat content
  • the ability of oil to flow
  • measure of weight

4: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection

5: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

6: Class T machine room

  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room
  • has no flame producing apparatus permanently installed
  • shall include closets used for setting equipment

7: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 277v
  • 240v
  • 120v
  • 208v

8: What is the maximum voltage range allowed on an electrical circuit?

  • 5%
  • 15%
  • 10%
  • 20%

9: The best way to detect ammonia in brine is

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

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

  • Industrial
  • Large mercantile
  • Instituional
  • Place of assembly

11: Which of the following is not an air velocity meter?

  • Anemotherm
  • Velometer
  • Hydrometer
  • Anemometer

12: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 50
  • 55
  • 15
  • 75

13: Watt's Law indicates Volts X Amps = _________.

  • Ohms
  • Resistance
  • Watts
  • Current

14: If the power element of an expansion valve should lose its charge the valve would

  • overfeed the evaporator
  • underfeed the evaporator
  • go closed
  • go open

15: How many BTU's is produced by one watt of energy

  • 2.57
  • 3.00
  • 3.41
  • 1

16: Can you use Ammonia in industrial applications?

  • When mixed with R-718
  • Yes, Under certain condidtions
  • Yes, always
  • No, never

17: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?

  • Fan-like action
  • Suction and discharge valves
  • Nesting scrolls
  • Rotating vanes

18: What type refrigerant is NOT ozone depleting?

  • HFC
  • HCFC
  • CFC
  • Halon

19: Halogenated refrigerants cannot be used with what material?

  • Copper
  • Magnesium alloy
  • Stainless steel
  • Aluminum

20: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When its white
  • When there is a space 6' or more above it
  • When there are sprinklers above
  • When it's used as part of a supply or return air system

21: A tachometer is an instrument used to measure

  • RPM
  • static pressure
  • speed
  • air velocity

22: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • gate or globe valves
  • king valves
  • ball valves
  • companion or block valves

23: A motor starter contains a thermal overload and a

  • solenoid
  • contactor
  • 3-way relay
  • transformer

24: E = I X R is

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

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

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