Topics: All categories in the pool
1: Who approves containers for refrigerants?
- D.O.E
- D.O.D
- D.O.T
- E.P.A
2: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- higher
- the same
- lower
3: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 400
- 100
- 350
- 250
4: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
5: Class T machine room
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
6: 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
7: The proper location for an oil separator is between the
- condenser and receiver
- compressor and condenser
- evaporator and compressor
- receiver and metering device
8: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 18
- 24
- 48
- 36
9: "R" represents ___ in the Ohm's law formula
- voltage
- amperage
- resistance
- capacitance
10: Which winding have the most turns?
- run
- depends on the motor phase
- Start
- they have equal amount of turns
11: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- release the charge when the pressure exceeds 310 psig or higher
- Pumpdown procedures are not allowed with systems containing liquid recievers
12: Clearance volume
- affects compressor capacity
- has no effect on compressor capacity
- varies depending on compressor speed
- is the same on all compressors
13: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- evaporator
- outside the machinery room
- compressor
- boiler
14: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 24
- 100
- 75
- 50
15: Ammonia is under what safety classification?
- B2
- B3
- A3
- B1
16: Secondary refrigerants are usually
- alcohol
- expensive
- water or brine
- Prestone anti-freeze
17: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
18: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 1,000
- 6.6
- 110
19: A chiller entering and leaving temperature difference is?
- 10 degrees F
- 5 degrees F
- 50 degrees F
- 20 degrees F
20: Bubbles in the liquid line sight glass could be caused by
- leaking discharge valves in the compressor
- bad low pressure switch
- plugged drier
- overcharge of oil
21: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 5 psig
- 0 psig
- 10 psig
22: Lithium-bromide, Li-Br, is best characterized as a
- sugar
- sand
- soil
- salt
23: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
24: On cooling towers, what causes the condenser water to drop
- tower fans
- sensible heat
- evaporation of the water droplets
- ambient temperatures
25: Three-phase motors have what type of windings?
- three run windings
- one start winding and one run winding.
- three start windings
- three run windings and 3 start windings