Topics: All categories in the pool
1: A restaurant is classified as a
- mixed occupancy
- large mercantile occupancy
- commercial occupancy
- public assembly occupancy
2: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- False
- depends on the type of refrigerant being used
- True
3: What is Absolute Zero?
- -773F
- -640F
- -400F
- -460F
4: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 3/32"
- 1/16"
- 1/8"
5: In a horizontal shell & tube condenser, the ammonia is liquefied by
- removing the latent heat of vaporization
- removing the latent heat of fusion
- passing thru the tubes from top to bottom
- water sprayed over condenser
6: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- merge
- purge
- splurge
- surge
7: Ammonia can come in contact with _______ ?
- Aluminum
- Copper tubing
- Copper
- Brass
8: A mercury bulb controller is not recommended for
- use where vibration is severe
- line or low voltage use
- low voltage use
- line voltage use
9: A class B2 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and highly flammable
- toxic and non-flammable
- non-toxic and non-flammable
10: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- relief plug
- fusion plug
- rupture plug
11: The leaving chilled water set point for comfort cooling is typically?
- 60
- 66
- 45
- 38
12: R-11 belongs to Group
- B-1
- B-3
- A-1
- A-2
13: Where a refrigeration or air conditioning system is installed,
- The company who installed the system must notify the fire department in the jurisdiction where installed
- A field inspection shall be made before it is put into service
- it shall not be operated below prescribed pressuers
- the form or certificate shall be authorized by the Department of Public Safety
14: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- sensible heat
- tower fans
- evaporation of the water droplets
15: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 44 lbs
- 13.9 lbs
- 22 lbs
16: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Insulated and cross broke
- Welded and seamed.
- Ducted and sealed
17: What type of relief valve is used on a CO2 system?
- glove disc
- fusible plug
- rupture disc
- gate valve
18: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
19: If the spring is adjusted to increase the superheat, this new setting will
- allow more liquid into the evaporator
- have no effect on the frost line
- shorten the frost line
- lengthen the frost line
20: What type refrigerant is NOT ozone depleting?
- Halon
- HFC
- CFC
- HCFC
21: 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
22: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
23: B3 refrigerants are considered
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
24: Give an example of a secondary coolant?
- R-717
- R-718
- R-12
- R-410A
25: What instrument is used to measure very high resistance?
- ammeter
- tape measure
- voltmeter
- meg ohmmeter