Topics: All categories in the pool
1: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
2: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
3: A movie theater would be considered a
- institutional occupancy
- public assembly occupancy
- mixed occupancy
- commercial occupancy
4: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 20 amps
- 10 amps
- 15 amps
- 5 amps
5: A Lithium-bromide system is an absorption system that
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses salts as an absorbent and lithium bromide as a refrigerant
6: What refrigerant doesn't have to be classified?
- R-134A
- R-717
- R-718
- R-422A
7: A motor starter contains a thermal overload and a
- 3-way relay
- contactor
- solenoid
- transformer
8: Copper and its alloys shall not be used with ammonia
- True
- False
9: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
10: What is R-22?
- CCFCM
- HFC
- Chlorodifluoromethane
- Chlorofluoromethane
11: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- A group sensing
- phosgene gas sening
- CO Sensing
- refrigerant sensing
12: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
13: A run capacitor is wired in series with the _____ windings.
- run
- common
- start
- start capacitor
14: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Insulated and cross broke
- Ducted and sealed
- Welded and seamed.
15: One ton of refrigeration is defined as ______ btu/minute.
- 60
- 200
- 720,000
- 12,000
16: How many forces operate a thermostatic expansion valve?
- 4
- 1
- 2
- 3
17: Dew point is
- the temperature of air of 50% RH
- 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 condense
- the temperature below which water vapor in the air will start to evaporate
18: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is
- Sensible heat
- Latent heat
- Enthalpy
- Specific heat
19: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
20: 1 HP = ____ Watts?
- 3,412
- 746
- 11,239
- 3.1416
21: A device used to measure small pressure differences is the
- anemometer
- manometer
- pyrometer
- phsycometirc
22: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- T&P device
- Relief valve
- Circuit Breaker
23: R-123 belongs to Group
- B-1
- A-3
- B-2
- B-3
24: The reversing valve is commonly used
- on commercial system that involve two different temperatures
- on multiple compressor systems
- on all heat pumps
- when the code requires a check valve
25: If a purge unit fails on a low pressure chiller, what are the symptoms?
- high head pressure
- low suction pressure
- increased capacity
- low pressure chillers do not have purge units