Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • Low side float
  • TXV
  • High side float

2: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

3: How many different groups of refrigerants are there?

  • 15
  • 7
  • 3
  • 11

4: How many square inches per square foot?

  • 64
  • 144
  • 98
  • 24

5: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

6: Oils, classified as to source, are

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

7: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, paper method, and frost line.
  • sight glass, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line

8: When must refrigeration system covered by the code be inspected?

  • Annually
  • Upon installation
  • Not required
  • Annually and when installed

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

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

10: 746 watts is equal to

  • 1 hp
  • Pi
  • 100 hp
  • 10 hp

11: "R" represents ___ in the Ohm's law formula

  • resistance
  • voltage
  • capacitance
  • amperage

12: The reversing valve is commonly used

  • on all heat pumps
  • on multiple compressor systems
  • on commercial system that involve two different temperatures
  • when the code requires a check valve

13: 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

14: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Steel, approved, weather-stripped
  • Self-closing, wooden, fire door
  • Self-closing, aligned, fire door

15: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • .1
  • 1.7
  • .8
  • 1.2

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

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

17: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 66
  • 50
  • 25
  • 22

18: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Magnesium alloy
  • Copper
  • Aluminum

19: 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

20: R-22 is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-2
  • B-1
  • A-1

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

  • Velometer
  • Hydrometer
  • Anemometer
  • Anemotherm

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

  • 155F
  • 32F
  • 45F
  • 158F

23: By using nitrogen within a pipe during brazing operation,

  • Discoloration is prevented
  • Copper oxide formation is prevented
  • Exterior scale formation is minimized
  • The explosion hazard is confined

24: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

25: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the outdoors
  • the mechanical room housing the refrigeration system
  • Machinery rooms need not be vented
  • the return air ducted system