Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If an oil’s floc point is too high, which of the following could occur?

  • low head pressure
  • high suction pressure
  • plugged expansion valve
  • compressor burn out

2: The location of a thermal bulb of a TXV affects

  • the amount of liquid returning to the compressor
  • the amount of liquid in the condenser.
  • the amount of liquid refrigerant in the evaporator
  • subcooling

3: What instrument is used to measure very high resistance?

  • ammeter
  • meg ohmmeter
  • voltmeter
  • tape measure

4: It is permissible to use a single-pole switch on a 2 HP motor running at 240 volts as long as the switch is rated for at least 2x FLA.

  • True
  • False

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

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

6: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 90
  • 110
  • 80
  • 100

7: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

8: 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

9: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • washed out of the air by the spray pump
  • blown to the atmosphere by the fan
  • accumulate in the sump water
  • remain in the air

10: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.

  • 7.25'
  • 7.00'
  • 8'4"
  • 9.00'

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

  • 9F
  • 11F
  • 29F
  • 21F

12: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • Solenoid valve
  • EEV
  • EPR valve
  • CPR valve

13: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • public assembly occupancy.
  • mercantile occupancy
  • business occupancy
  • commercial occupancy

14: Ammonia belongs to Group

  • B-1
  • A-1
  • B-2
  • A-2

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

  • Inspected
  • Pressurized
  • Leak tested
  • Insulated

16: Refrigerants shall be classified by

  • toxicity and flammability
  • color codes
  • maximum permissible quantities of each group
  • requirements for commercial, industrial, and residential occupancies

17: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 66
  • 45
  • 38

18: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 2.5, 2.5
  • 6.6, 6.6
  • 2.5, 3.0
  • 3.0, 3.5

19: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and unbalanced head and friction head
  • GPM, pipe size, and equivalent head.
  • GPM and friction head

20: A class A3 refrigerant is considered

  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and non-flammable
  • toxic and somewhat flammable

21: Joints in piping for refrigeration containing parts must withstand temperatures of ___?

  • 700F
  • 1000F
  • 600F
  • 800F

22: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • printed circuit board (PCB)
  • centrifugal switch
  • duel-voltage switch

23: Dew point is

  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to condense
  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to evaporate

24: Which winding have the most turns?

  • they have equal amount of turns
  • run
  • depends on the motor phase
  • Start

25: At higher altitudes, boiling temperatures

  • increase
  • decrease
  • depends on the refrigerant
  • are unaffected