Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 100
  • 10,000
  • 1,000
  • 100,000

2: 1 HP = ____ Watts?

  • 11,239
  • 3.1416
  • 746
  • 3,412

3: 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

4: Ammonia vaporization takes place at what temperature?

  • -28F
  • -110F
  • -460F
  • -32F

5: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 2.5
  • 1250
  • There isn't enough information to answer.
  • 2

6: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 45F
  • 155F
  • 158F
  • 32F

7: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

8: What is a Category "D" fluid?

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

9: If air is present in an absorption chilled water appliance, which of the following will most likely occur?

  • The Li-Br solution will become more diluted
  • Rust can form
  • The Li-Br solution will become more concentrated
  • System operating pressure will drop

10: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 455 psig, 185 psig.
  • 257 psig, 77 psig
  • 365 psig, 120 psig
  • 226 psig, 68 psig

11: The generator shell contains the

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

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

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

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

  • 10%
  • 15%
  • 5%
  • 20%

14: Excessive head pressure is often caused by

  • insufficient refrigerant
  • thermostat set too high
  • leaking reed valve on the discharge side
  • air cooled condenser is plugged

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

  • R-718
  • R-134A
  • R-717
  • R-422A

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

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

17: How are a compressor and condenser fan wired?

  • series
  • parallel
  • series-parallel
  • parallel-series

18: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of vaporization
  • removing the latent heat of fusion
  • passing thru the tubes from top to bottom
  • water sprayed over condenser

19: Class A refrigerants are considered

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

20: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • Section 8 ASHREA 15 ASME unfired
  • OSHA
  • Section ASHREA 34

21: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 10
  • 18
  • 15
  • 24

22: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Saturated temperature
  • Critical temperature
  • Dry bulb temperature
  • Wet bulb temperature

23: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 80%
  • 90%
  • 75%
  • 100%

24: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When it's used as part of a supply or return air system
  • When its white
  • When there is a space 6' or more above it

25: On a centrifugal compressor, stationary diffuser vanes are needed to

  • convert velocity energy to pressure
  • prevent high pressure on the packing
  • stop gas flow
  • increase the clearance space