Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What would be the classification of a prison?

  • Institutional
  • Place of assembly
  • Large mercantile
  • Industrial

2: A thermometer inside a duct measures ____ heat.

  • latent
  • sensible
  • specific
  • hidden

3: Before replacing a seized compressor, the _______ should be determinded.

  • cause of seizure
  • current draw
  • designed head pressure
  • type of refrigerant

4: No open flames are allowed in the machinery room unless?

  • Approved by the authorized person
  • Only when combustion air is provided from outside of the machinery room
  • Approved by the installing contractor
  • Never can be allowed

5: A tachometer is an instrument used to measure

  • RPM
  • air velocity
  • static pressure
  • speed

6: Low pressure systems have what kind of compressor?

  • Scroll
  • Rotary
  • Centrifugal
  • Reciprocating

7: Excessive head pressure is often caused by

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

8: A direct system

  • is one which encloses a separate body of evaporative refrigerant
  • is a self-contained complete factory made and tested system
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated

9: On a TXV, the purpose of an external equalizer is to?

  • compensate for a pressure drop across the evaporator coil
  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm
  • balance the evaporator load

10: An air conditioning system rated for 36,000 BTU's is equivalent to

  • one ton of cooling
  • 12,000 tons of cooling
  • two tons of cooling
  • three tons of cooling

11: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

12: Class T machine room

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

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

  • Close
  • Over feed
  • Stay open
  • Under feed

14: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • place sign, check for leaks, insulate
  • you can't change refrigerants
  • make sure it's compatible, notify owner, notify A.H.J
  • nothing must be done

15: The most common type of motor starter is

  • part winding starter
  • duel-winding starter
  • delts-wye starter
  • across the line starter

16: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

17: Can you use Ammonia in industrial applications?

  • When mixed with R-718
  • Yes, Under certain condidtions
  • No, never
  • Yes, always

18: Can ammonia be used on domestic system?

  • no
  • no, unless there is proper ventilation system installed
  • yes, for systems under 10 tons
  • yes

19: Megaohm meters can detect a ground in the

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

20: Heat transferred by conduction from one body to another is done

  • via radiation
  • via liquids
  • via solids
  • via heat rays

21: What must be done to refrigerant pipes before being buried?

  • Certified
  • Leaked checked
  • Encased
  • Coated

22: While the system is operating, the discharge line should be

  • at the same temperature as the crankcase
  • 10-15F warmer than ambient
  • too hot to hold by hand
  • room temperature

23: Crankcase heaters are energized

  • when the compressor is off
  • to allow easy compressor start-up
  • while the compressor is running
  • to prevent compressor freeze-up

24: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

25: The Board of Boilers adopts by reference

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