Topics: All categories in the pool
1: How many gallons of water per pound of ammonia do you need?
- 15
- 20
- 1
- 5
2: The principle used in continuous type absorption systems is
- Boyle's Law
- Ohm's Law
- Charles's Law
- Dalton's Law
3: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
4: Ammonia is under what safety classification?
- A3
- B1
- B2
- B3
5: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- the gas returns to a liquid
6: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
- between the compressor and the stop valve
7: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
8: Class 3 refrigerants are
- highly flammable
- non-flammable
- toxic
- non-toxic
9: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature below which water vapor in the air will start to condense
- the temperature of air of 50% RH
10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- CFC-11
- Lithium bromide
- ammonia
- HCFC-123
11: Excessive head pressure is often caused by
- thermostat set too high
- air cooled condenser is plugged
- insufficient refrigerant
- leaking reed valve on the discharge side
12: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
13: Which of the following controllers would you expect to be most sensitive to temperature changes?
- low voltage t-stat
- aquastat
- immersion controller
- line voltage t-stat
14: What refrigerant doesn't have to be classified?
- R-134A
- R-422A
- R-717
- R-718
15: Usually dry bulb temperature is
- lower than dry bulb temperature
- not important and shall be ignored
- higher than wet bulb temperature
- same as wet bulb temperature
16: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- There isn't enough information to answer.
- 10 amps
- 24 amps
17: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 8'4"
- 7.00'
- 7.25'
18: Which is considered the more efficient condenser?
- spray cooled
- air cooled
- water cooled
- fan cooled
19: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- tight fitting doors
- automatic ventilation
- self-closing doors
20: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
21: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 700F
- 1000F
- 600F
22: A thermometer inside a duct measures ____ heat.
- specific
- sensible
- latent
- hidden
23: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Magnesium alloy
- Aluminum
- Copper
24: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
25: Horizontal piping should be run level.
- False
- True
- Yes, if the condenser is located above the evaporator
- No, unless the supervisor on the job says so.