Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If the spring is adjusted to increase the superheat, this new setting will

  • shorten the frost line
  • allow more liquid into the evaporator
  • have no effect on the frost line
  • lengthen the frost line

2: Class A refrigerants are considered

  • flammable
  • non-toxic
  • toxic
  • non-flammable

3: Which winding have the most turns?

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

4: Heat is a form of

  • energy
  • power
  • matter
  • work

5: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 600 watts
  • 5KW
  • 1000 watts

6: A restaurant is classified as a

  • commercial occupancy
  • mixed occupancy
  • public assembly occupancy
  • large mercantile occupancy

7: A single pole-double throw switch used how many wires excluding the ground wire?

  • four
  • three
  • two
  • five

8: What would be the classification of a prison?

  • Institutional
  • Large mercantile
  • Place of assembly
  • Industrial

9: Ammonia belongs to Group

  • B-1
  • A-2
  • A-1
  • B-2

10: Class T machine room

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

11: 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)
  • duel-voltage switch
  • centrifugal switch

12: "E" references ____ in the Ohm's law formula

  • amperage
  • voltage
  • capacitance
  • resistance

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

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

14: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 13.9 lbs
  • 6.6 lbs
  • 44 lbs
  • 22 lbs

15: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • .8
  • 1.7
  • .1
  • 1.2

16: How many flammability classifications are refrigerants in?

  • 5
  • 7
  • 2
  • 3

17: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

18: The solution that leaves the concentrator in an absorption chiller is referred to as the

  • absorbed solution
  • weak solution
  • strong solution
  • diluted solution

19: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • run voltage
  • pick up voltage
  • boost voltage
  • lift voltage

20: "R" represents ___ in the Ohm's law formula

  • resistance
  • amperage
  • voltage
  • capacitance

21: What is a Category "D" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperature of over 366F

22: Brazed joints melt at temperatures above

  • 800F
  • 500F
  • 1,000F
  • 1,200F

23: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 50
  • 100
  • 24
  • 75

24: A mixed occupancy occurs when two or more occupancies are located with the same building

  • true
  • false

25: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct