Topics: All categories in the pool
1: A Lithium-bromide system is an absorption system that
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
2: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
3: Three-phase motors have what type of windings?
- three run windings
- three start windings
- three run windings and 3 start windings
- one start winding and one run winding.
4: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- Dirty fan blades
- Dirty Coil
- High ambient temperature
5: If your suction line is warmer than the room temperature, this may indicate
- below normal superheat
- an over charge
- plugged air filter
- a low charge
6: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- overcharge of oil
- leaking discharge valves in the compressor
- plugged drier
7: What device should be used on low-temperature freezers?
- high capacity TXV
- discharge muffler
- oil separator
- hot-gas by-pass
8: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- water sprayed over condenser
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
9: A start capacitor in series with a start winding will
- increase starting torque
- increase running efficiency
- decrease the amp draw of the motor
- increase the amp draw of the motor
10: A run capacitor is wired in series with the _____ windings.
- start
- start capacitor
- common
- run
11: Which winding have the most turns?
- depends on the motor phase
- they have equal amount of turns
- run
- Start
12: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Upon installation
- Annually
- Not required
13: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
14: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
15: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
16: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 106 amps
- 1K amps
- 1.6 amps
17: A water regulating valve opens when
- when the power is on there is an overcharge of refrigerant
- the head pressure rises
- when the power is on
- the compressor is on
18: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- commercial occupancy
- business occupancy
- public assembly occupancy.
19: 1 HP = ____ Watts?
- 3,412
- 11,239
- 746
- 3.1416
20: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- low head pressure
- moisture in the system
- not enough oil in the system
- oil in evaporator
21: The formula for Pure Power in a resistance circuit is
- Watts X power factor
- Kw = volts X amps
- Watts X amps.
- Watts = volts X amps
22: Machinery rooms must be vented to ______?
- basement
- outdoors
- unoccupied spaces
- neutralizing tank
23: Halogenated refrigerants cannot be used with what material?
- Aluminum
- Copper
- Magnesium alloy
- Stainless steel
24: An accumulator can be located between the
- first stage and second stage compressors
- evaporator and compressor
- condenser and evaporator
- compressor and condenser
25: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct