Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The freezing point of water at sea level is?

  • 32C
  • -10C
  • 32F
  • 0F

2: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

3: The equivalent length of pipe in a water piping system is

  • the total length of pipe as you would measure it
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe as you would measure it plus 25% for fittigns

4: A moisture indicator must

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

5: What pipe can not be used for refrigeration?

  • L
  • M
  • N
  • K

6: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • regularly
  • quarterly
  • bi-annually
  • annually

7: How can you test mechanical strength of an electrical connection?

  • measure ohms with an electrical meter
  • measure voltage across the connection
  • attempt to pull the wire from the connector by hand
  • none of the above.

8: Name a reason that does not cause reduced condenser air quantity

  • Dirty Coil
  • Prevailing winds
  • Dirty fan blades
  • High ambient temperature

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

  • True
  • False

10: In an electrical circuit, what is potential measured in?

  • Amps
  • Herys
  • Volts
  • Ohms

11: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • At least 40'
  • At least 30'
  • There is no minimum for relief valve and windows.

12: Clearance volume

  • has no effect on compressor capacity
  • affects compressor capacity
  • varies depending on compressor speed
  • is the same on all compressors

13: Megaohm meters can detect a ground in the

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

14: It takes how many BTU/hr to melt one pound of ice at 32F

  • 180
  • 212
  • 144
  • 970

15: Increasing superheat will do what to your frost line?

  • Decrease
  • Nothing
  • Could either increase or decrease depending on the load conditions
  • Increasae

16: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation

17: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • compressor suction valve stuck open
  • starved evaporator
  • too small evaporator
  • overcharged

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

  • Anemometer
  • Hydrometer
  • Velometer
  • Anemotherm

19: A relief valve discharge capacity is rated in

  • PSIA
  • temperature minus pounds of air per second divided by release rate squared
  • Pounds of air per minute.
  • PSIG

20: Ohm's Law indicates Amps X Resistance = ___________.

  • Impedance
  • Current
  • Volts
  • Ohms

21: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

22: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

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

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

24: The absorber shell contains the

  • evaporator and the absorber
  • condenser and the generator
  • condenser, the evaporator, and the generator
  • condenser and the absorber

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

  • five
  • two
  • four
  • three