Topics: All categories in the pool
1: The freezing point of water at sea level is?
- 32C
- 0F
- 32F
- -10C
2: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 21F
- 11F
- 29F
- 9F
3: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
4: 1 Watt = ______ BTU's?
- 4.482
- 7.216
- 12
- 3.412
5: On a TXV, the purpose of an external equalizer is to?
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
6: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- B-1
- A-2
- A-1
7: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 5/16"
- 3/32"
- 1/8"
8: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 80 ohms
- 71 ohms
- 104 ohms
- 27 ohms
9: Class 3 refrigerants are
- highly flammable
- toxic
- non-flammable
- non-toxic
10: What is not a requirement of a class T machine room?
- self-closing doors
- automatic ventilation
- fire hose connection to the building fire protection system
- tight fitting doors
11: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
12: Sensible heat is the heat added to a substance to
- cause evaporation
- freeze it
- raise its temperature
- change its state
13: Name three things that must be done when changing refrigeration lubricant?
- You can't change lubricants.
- Place sign, check for leaks, insulate
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
14: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
15: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- overcharged
- compressor suction valve stuck open
- starved evaporator
- too small evaporator
16: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 18
- 33
- 50
17: R-11 belongs to Group
- A-2
- B-1
- B-3
- A-1
18: 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
19: Class T machine room
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
20: While the system is operating, the discharge line should be
- 10-15F warmer than ambient
- room temperature
- too hot to hold by hand
- at the same temperature as the crankcase
21: What type of oil is used in R-410A systems?
- mineral oil
- polyalkylene glycol (PAG)
- naphthene
- polyolester (POE)
22: 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
23: Liquid level gauges must be provided with what?
- Automatic shut-offs
- A relief valve
- A red line
- A low level mark
24: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
25: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 1000 watts
- 600 watts
- 746 watts
- 5KW