Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: All electrical work done on refrigeration systems must comply with

  • ASHREA-15 Section 9.2.1
  • NEC and Massachusetts Modifications
  • OSHA
  • Department of Energy

2: What must be done if refrigeration lines pass through a concrete floor?

  • insulated
  • installed through a pipe casing
  • leak checked
  • moisture barrier

3: One ton of refrigeration is defined as ______ btu/minute.

  • 200
  • 12,000
  • 60
  • 720,000

4: A Low-Probability System

  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space

5: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

6: What type of copper is not permitted on refrigeration systems?

  • Type L
  • Type N
  • Type M
  • Type K

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

  • 3.41
  • 3.00
  • 1
  • 2.57

8: Which refrigerant is lighter than air?

  • R-123
  • R-11
  • R-134a
  • R-717

9: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

10: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 365 psig, 120 psig
  • 257 psig, 77 psig
  • 226 psig, 68 psig
  • 455 psig, 185 psig.

11: A moisture indicator must

  • be filled with liquid
  • be sight side up
  • be yellow
  • change color when exposed to moisture

12: How are refrigerant blends classified?

  • Based on the oil used
  • Based on best case Fractionation
  • Blends don't have to be classified
  • Based on worst case fractionation

13: On a TXV, the purpose of an external equalizer is to?

  • Increase the pressure on the top of the power head diaphragm
  • allow a greater adjustment spam
  • compensate for a pressure drop across the evaporator coil
  • balance the evaporator load

14: _____ and its alloys are suitable for use with ammonia systems.

  • Copper
  • Aluminum
  • Zinc
  • Magnesium

15: One atmosphere equals

  • 14.7
  • 0 psia
  • 0 psig
  • 29.4

16: How many volts would you read on a 480V system phase to phase?

  • 0
  • 480
  • 1/3 the voltage
  • 277

17: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • far apart or greater difference
  • a ling psychrometer doesn't have two theremometers.
  • 2F difference
  • nearly the same

18: Joints in refrigeration piping must be _____ before being covered?

  • Leak tested
  • Pressurized
  • Insulated
  • Inspected

19: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 3/32"
  • 1/16"
  • 1/8"

20: How many gallons of water do you need per pound of ammonia?

  • 10
  • 50
  • 100
  • 1

21: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and the solution will evaporate.
  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates

22: A High-Probability System

  • is a system highly likely to leak form a failed connection or component of such system
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is such that a leak of refrigerant from a failed connection will enter an unoccupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area

23: On a single phase motor, when does the start winding cut out?

  • 75% of its RLA speed
  • 50% of its RLA speed
  • 25% of its RLA speed
  • 100% of its RLA speed

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

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

25: Which is considered the more efficient condenser?

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