Topics: All categories in the pool
1: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
2: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-1
- B-1
- A-2
3: A rule of thumb in air conditioning is ____ CFM per ton?
- 500
- 600
- 400
- 100
4: Which oil is hydoscopic?
- polyolester
- mineral
- SW30
- animal
5: Ammonia is under what safety classification?
- B3
- B2
- B1
- A3
6: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
7: A professional or office building would be considered what type of occupancy?
- mercantile
- business
- commercial
- public assembly
8: A class B2 refrigerant is considered
- toxic and somewhat flammable
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
9: Which refrigerant class listed below is the most flammable?
- B-2
- A-1
- A-3
- C-3
10: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 15
- 25
- 10
11: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
12: 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
13: A device used to measure small pressure differences is the
- phsycometirc
- pyrometer
- manometer
- anemometer
14: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Approved by the authorized person
- Approved by the installing contractor
- Only when combustion air is provided from outside of the machinery room
15: A solder joint melts at temperatures of
- 600F to 900F
- 400F to 800F
- 1,200F to 1,500F
- less than 400F
16: 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
17: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Air
- Oil
- Heat
- Electricity
18: Watt's Law indicates Volts X Amps = _________.
- Resistance
- Ohms
- Watts
- Current
19: How much clearance do you need around the perimeter of electrical panels?
- 24"
- 18"
- 12"
- 36"
20: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
21: What refrigerant were phased out in 2004?
- R-11
- R-134a
- R-12
- R-22
22: What type of copper is not permitted on refrigeration systems?
- Type M
- Type L
- Type K
- Type N
23: How is bring measured?
- manometer
- hydrometer
- hygrometer
- anemometer
24: While the system is operating, the discharge line should be
- too hot to hold by hand
- at the same temperature as the crankcase
- 10-15F warmer than ambient
- room temperature
25: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Aluminum
- Magnesium alloy
- Copper