Topics: All categories in the pool
1: 1 Watt = ______ BTU's?
- 7.216
- 3.412
- 12
- 4.482
2: What is NOT a positive displacement compressor.
- Centrifugal
- Rotary
- Scroll
- Reciprocating
3: What measures gas pressure?
- Hydrometer
- Hygrometer
- Barometer
- Manometer
4: E = I X R is
- Ohms Law
- Watts Law
- Impedance Law
- Amps Law
5: Halogen refrigerants are corrosive to which type of metal?
- black iron
- magnesium
- stainless steel
- copper
6: Class 3 refrigerants are
- toxic
- non-flammable
- non-toxic
- highly flammable
7: A capacitor in series with the start windings will do what?
- Increase starting torque
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
- Nothing
8: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
9: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
10: Watt's Law indicates Volts X Amps = _________.
- Watts
- Resistance
- Current
- Ohms
11: How many BTU's is produced by one watt of energy
- 2.57
- 1
- 3.41
- 3.00
12: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 90%
- 75%
- 80%
13: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
14: Ammonia is under what safety classification?
- A3
- B2
- B1
- B3
15: R-717 is
- ammonia
- trichloromethane
- carbon dioxide
- water
16: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- first disconnect in
- breaker panel in
- load-side of the contactor in
- 24 volt secondary side of the Class 2 transformer to the thermostat
17: The color code of a tank of ammonia is
- white
- silver
- lavender
- light green
18: Can you use Ammonia in industrial applications?
- When mixed with R-718
- No, never
- Yes, Under certain condidtions
- Yes, always
19: A declaration test is needed when the system contains more than
- 110 lbs
- 120 lbs
- 65 lbs
- 55 lbs
20: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
21: The location of a thermal bulb of a TXV affects
- the amount of liquid returning to the compressor
- the amount of liquid in the condenser.
- subcooling
- the amount of liquid refrigerant in the evaporator
22: A movie theater would be considered a
- public assembly occupancy
- institutional occupancy
- mixed occupancy
- commercial occupancy
23: Two systems using separate refrigerants that are superimposed upon one another is called
- indirect
- cascade
- single stage
- booster
24: What refrigerant doesn't have to be classified?
- R-717
- R-134A
- R-718
- R-422A
25: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above