Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is the maximum voltage range allowed on an electrical circuit?

  • 10%
  • 20%
  • 15%
  • 5%

2: Three-phase motors have what type of windings?

  • three run windings
  • three run windings and 3 start windings
  • three start windings
  • one start winding and one run winding.

3: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

4: A moisture indicator must

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

5: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

6: When should a relief valve start to function?

  • Before the purge station discharges
  • 10 psi before it's set pressure
  • Two times it's working pressure
  • At it's set pressure

7: Which oil is hydoscopic?

  • animal
  • polyolester
  • mineral
  • SW30

8: Which refrigerant class listed below is the most flammable?

  • A3
  • B2
  • A2
  • C3

9: If your suction line is warmer than the room temperature, this may indicate

  • an over charge
  • plugged air filter
  • below normal superheat
  • a low charge

10: Class A refrigerants are considered

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

11: What refrigerant is an inorganic compound?

  • R-410A
  • Ammonia
  • R-132A
  • R-22

12: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • III
  • 10
  • 25
  • 15

13: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • refrigerant sensing
  • phosgene gas sening
  • CO Sensing
  • A group sensing

14: 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)?

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

15: What refrigerant doesn't have to be classifted?

  • R-711
  • R-718
  • R-717
  • R-134a

16: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

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

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

18: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

19: The difference between saturated liquid and saturated vapor is

  • heat
  • pressure
  • volume
  • temperature

20: 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

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

21: If the power element on an expansion valve should lose its charge, the valve would

  • Over feed
  • Under feed
  • Stay open
  • Close

22: The best way to detect ammonia in brine is

  • nessler regaent
  • CO2 gas
  • carbonation of soda
  • potassium of line

23: NH3 is

  • R-718
  • lithium bromide
  • ammonia
  • R-508A

24: A declaration test is needed when the system contains more than

  • 65 lbs
  • 110 lbs
  • 120 lbs
  • 55 lbs

25: Megaohm meters can detect a ground in the

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