Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Booster compressors, pump refrigerant into the

  • heat & plate heat exchanges
  • receiver
  • low side of the primary compressor
  • high side of the secondary compressor

2: Low-side system leaks in a low-pressure chiller will often result in

  • air being pulled into the system
  • system refrigerant leaking from the system
  • water being pulled into the system
  • nitrogen leaking out of the system.

3: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

4: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • refrigerant control
  • capacity control

5: The purpose of an accumulator is to

  • assure no liquid returns to the compressor
  • store excess refrigerant from the reciver
  • filter out impurities from the system
  • reduce friction loss to the flow of refrigerant

6: The generator shell contains the

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

7: Fractionation occurs when

  • the pressures increase as the heat load increases
  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • when a fraction of refrigerant is added as the full charge
  • the pressures decreases as the heat load decreases

8: What is a Category "M" fluid?

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

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

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

10: Halogenated refrigerants cannot be used with what material?

  • Copper
  • Stainless steel
  • Aluminum
  • Magnesium alloy

11: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

12: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

13: 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

14: What is used to check very low pressure?

  • Hygrometer
  • Manometer
  • Velometer
  • Hydrometer

15: 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

16: A professional or office building would be considered what type of occupancy?

  • public assembly
  • business
  • mercantile
  • commercial

17: Which occupancy can ammonia be used in?

  • depends on the quantity of freon
  • industrial
  • commercial
  • redifential

18: What is Absolute Zero?

  • -460F
  • -773F
  • -400F
  • -640F

19: The Board of Boilers adopts by reference

  • the 1997 ANSI/ASHRAE Safety Code
  • Montreal Protocol Safety Code
  • the MACS Pressure Vessel Code of Massachusetts
  • MSCA Code

20: On cooling towers, what causes the condenser water to drop

  • ambient temperatures
  • tower fans
  • evaporation of the water droplets
  • sensible heat

21: 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

22: A device used to measure small pressure differences is the

  • manometer
  • phsycometirc
  • pyrometer
  • anemometer

23: How many BTU's is produced by one watt of energy

  • 3.00
  • 1
  • 3.41
  • 2.57

24: Name three things that must be done when changing refrigeration lubricant?

  • You can't change lubricants.
  • Nothing must be done
  • Place sign, check for leaks, insulate
  • Make sure it's compatible, notify owner, notify AHJ

25: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 200
  • 330
  • 100