Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The purpose of a receiver is

  • a vessel to store refrigerant outside the system
  • to increase the capacity that the system can hold
  • to use a a later date
  • all of the above

2: What is a megaohm meter?

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

3: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 38
  • 45
  • 66

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

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

5: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • high side of the system
  • the vapor side of the system
  • low side of the system
  • the liquid side of the system

6: Where a refrigeration or air conditioning system is installed,

  • it shall not be operated below prescribed pressuers
  • A field inspection shall be made before it is put into service
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • the form or certificate shall be authorized by the Department of Public Safety

7: 1 HP = ____ Watts?

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

8: How are a compressor and condenser fan wired?

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

9: The outer portion of shell of the compressor used on low-pressure chillers is called the

  • volute
  • suction
  • nozzle
  • baffle

10: What is the boiling point of refrigerant governed by?

  • Compressor RPM's
  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling

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

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

12: A class B1 refrigerant is considered

  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic and somewhat flammable
  • toxic but non-flammable

13: Oils, classified as to source, are

  • naphthalene, paraffin, and castor
  • naphthalene, mixed, and paraffin
  • animal, vegetable, and mineral
  • animal, vegetable, and castor

14: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

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

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

16: Liquid level gauges must be provided with what?

  • Automatic shut-offs
  • A relief valve
  • A low level mark
  • A red line

17: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 50
  • 100
  • 550
  • 350

18: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would have no effect on the condenser
  • it would make the condenser less efficient
  • it would make the condenser more efficient
  • it would cause the condenser to sweat

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

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

20: One ton of refrigeration is defined as ______ btu/minute.

  • 60
  • 12,000
  • 200
  • 720,000

21: Ammonia vaporization takes place at what temperature?

  • -460F
  • -32F
  • -28F
  • -110F

22: How many gallons of water do you need per pound of ammonia?

  • 10
  • 1
  • 50
  • 100

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

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

24: Increasing superheat will do what to your system?

  • Nothing
  • Increase liquid flow
  • Increase gas flow
  • Decrease liquid flow

25: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above