Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the aggregate of the high side and low side
  • the high side
  • the low side
  • 2.5 times the design pressure

2: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or less
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or more

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

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

4: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

5: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

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

  • mercantile
  • commercial
  • business
  • public assembly

7: What pipe can not be used for refrigeration?

  • L
  • M
  • K
  • N

8: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices
  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs

9: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 21F
  • 29F
  • 11F
  • 9F

10: When the compressor is below the condensor

  • traps are needed on the suction line
  • traps are not needed on this type of system
  • traps are needed on the oil return line
  • traps are needed on the discharge line

11: What section governs pressure vessels?

  • OSHA
  • Section 1 ASHREA 15 ASME fired
  • Section ASHREA 34
  • Section 8 ASHREA 15 ASME unfired

12: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

13: Excessive head pressure is often caused by

  • leaking reed valve on the discharge side
  • insufficient refrigerant
  • thermostat set too high
  • air cooled condenser is plugged

14: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

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

  • 208v
  • 120v
  • 240v
  • 277v

16: Usually dry bulb temperature is

  • higher than wet bulb temperature
  • not important and shall be ignored
  • same as wet bulb temperature
  • lower than dry bulb temperature

17: A Low-Probability 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 will enter the occupied space
  • is such that a leak of refrigerant from a failed connection can not enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system

18: 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

19: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • ammonia
  • trichlorotrifluoromethane
  • R-718
  • methyl chloride

20: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 6.830
  • 3.415
  • 16.64
  • 34.15

21: An electronic bridge circuit is basically a

  • 24 volt control circuit
  • suspension
  • high voltage circuit
  • Wheatstone

22: Gauge pressure is

  • Force of pressure above that of atmosphere
  • Atmospheric pressure
  • Barometric pressure
  • Absolute pressrue

23: What do you need to do when you install a new system?

  • Have it inspected
  • Document the superheat and subcooling reading
  • Insulate the suction line before you take a superheat reading
  • Add refrigerant

24: Megaohm meters can detect a ground in the

  • up to 10,000 ohms
  • up to 1,000 ohms
  • up to 1,000,000 ohms
  • 10,000,000 ohms or higher

25: E = I X R is

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