Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A moisture indicator must

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

2: The difference between saturated liquid and saturated vapor is

  • pressure
  • heat
  • volume
  • temperature

3: How many closing forces operate a thermostatic expansion valve?

  • 4
  • 2
  • 1
  • 3

4: E = I X R is

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

5: 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

6: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?

  • Positive displacement
  • Low Pressure displacement
  • Pressure induced displacement.
  • Non-positive displacement

7: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

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

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

9: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

10: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Cascade
  • Low pressure
  • Simple
  • R-414B

11: What happens after your initial inspection of a pressure vessel?

  • Notify the Fire Marshal that the system has been inspected and approved
  • There is a temporary shut-down until a final inspection can be performed.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the AHJ to let them know that the system been inspected

12: No open flames are allowed in the machinery room unless?

  • Approved by the installing contractor
  • Never can be allowed
  • Only when combustion air is provided from outside of the machinery room
  • Approved by the authorized person

13: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 327 psig
  • 365 psig
  • 255 psig
  • 125 psig

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

  • Hydrometer
  • Anemotherm
  • Anemometer
  • Velometer

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

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

16: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

17: What is the purpose of suction/discharge traps?

  • to ensure proper oil return to the compressor
  • to keep oil inside the evaporator for proper oil return to the compressor
  • to keep oil inside of the accumulator for proper return to the compressor
  • all of the above

18: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

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

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

20: Ammonia belongs to Group

  • A-2
  • B-1
  • A-1
  • B-2

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

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

22: When a refrigeration or air conditioning system is installed

  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.
  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall not be operated below prescribed pressures

23: By using nitrogen within a pipe during brazing operation,

  • The explosion hazard is confined
  • Exterior scale formation is minimized
  • Discoloration is prevented
  • Copper oxide formation is prevented

24: The heat picked up in the evaporator must equal to

  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled
  • the heat gained by the condenser

25: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • reset the safety valve
  • reset the expansion valve
  • start the fan and circulating pump
  • start the comrpessor