Topics: All categories in the pool
1: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
2: A VRF system is a direct system
- true
- false
3: What is the boiling point of refrigerant governed by?
- P&T relationship
- Compressor RPM's
- Condenser sub-cooling
- Evaporator temperature
4: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
5: 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 friction head
- GPM and balanced head and friction head
6: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
7: Can ammonia be used on domestic system?
- yes
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
- no
8: 1 HP = ____ Watts?
- 3,412
- 3.1416
- 11,239
- 746
9: Crankcase heaters are energized
- while the compressor is running
- when the compressor is off
- to prevent compressor freeze-up
- to allow easy compressor start-up
10: Heat is a form of
- matter
- power
- energy
- work
11: Color is important in oil because
- allows you to see into crankcase
- it indicates the viscoisty.
- it makes sight glasses easy to read
- can tell us something about the refining of oil
12: How many gallons of water do you need per pound of ammonia?
- 10
- 50
- 100
- 1
13: The color code of a tank of ammonia is
- white
- silver
- lavender
- light green
14: What does safe access mean?
- Locked doors
- Well-lit exit signs
- A clear unobstructed path to the equipment and controls
- OSHA approved
15: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Water and soap
- Oil and water
- Air and dirt
- Moisture and air
16: Ammonia vaporization takes place at what temperature?
- -32F
- -28F
- -110F
- -460F
17: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
18: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 500
- 400
- 600
19: What refrigerant were phased out in 2004?
- R-12
- R-11
- R-134a
- R-22
20: A hissing noise at the expansion valve is a good indication that
- expansion valve is oversized
- nothing is passing thru
- liquid is passing thru it
- gas is passing thru it
21: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
22: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When it's used as part of a supply or return air system
- When its white
- When there are sprinklers above
- When there is a space 6' or more above it
23: On a centrifugal compressor, stationary diffuser vanes are needed to
- convert velocity energy to pressure
- prevent high pressure on the packing
- stop gas flow
- increase the clearance space
24: The generator shell contains the
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
- evaporator and the absorber
25: The outer portion of shell of the compressor used on low-pressure chillers is called the
- baffle
- nozzle
- volute
- suction