Topics: All categories in the pool
1: Adjusting the spring pressure on a TXV
- changes superheat
- adjusts the bulb charge
- changes subcooling
- makes no difference
2: What type refrigerant is NOT ozone depleting?
- Halon
- CFC
- HCFC
- HFC
3: What type of copper is not permitted on refrigeration systems?
- Type N
- Type L
- Type M
- Type K
4: 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
5: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it
6: What is Absolute Zero?
- -400F
- -773F
- -460F
- -640F
7: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 5.5
- 2.0
- 3.0
8: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the mechanical room housing the refrigeration system
- Machinery rooms need not be vented
- the outdoors
9: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
10: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Dry bulb temperature
- Saturated temperature
- Critical temperature
- Wet bulb temperature
11: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
- Approved by the installing contractor
- Approved by the authorized person
12: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
13: Which creates more of a heat load?
- 90% RH
- 70% RH
- 30% RH
- 50% RH
14: What is R-22?
- CCFCM
- HFC
- Chlorodifluoromethane
- Chlorofluoromethane
15: R-11 belongs to Group
- B-3
- A-1
- B-1
- A-2
16: NH3 is
- lithium bromide
- ammonia
- R-718
- R-508A
17: Three-phase motors have what type of windings?
- three start windings
- three run windings and 3 start windings
- three run windings
- one start winding and one run winding.
18: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- Rust can form
- The Li-Br solution will become more diluted
- System operating pressure will drop
- The Li-Br solution will become more concentrated
19: A thermometer inside a duct measures ____ heat.
- sensible
- hidden
- latent
- specific
20: Clearance volume
- is the same on all compressors
- affects compressor capacity
- varies depending on compressor speed
- has no effect on compressor capacity
21: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
22: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Insulated and installed in a pipe duct (Encased)
- Certified
- Classifed
- Leak checked
23: What is a high-side float?
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
24: When an inspection is needed, how often must it be done?
- every 36 months
- every 18 months
- annually
- every 24 months
25: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- magnesium
- black iron