Topics: All categories in the pool
1: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low suction pressure and low discharge pressure
- Low head pressure and high suction pressure
- High head pressure and low suction pressure
- High suction pressure and high discharge pressure.
2: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Rupture disk
- Fusible plug
- Gate valve
3: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- lift voltage
- run voltage
- pick up voltage
- boost voltage
4: The color code of a tank of ammonia is
- white
- silver
- light green
- lavender
5: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Screw
- Scroll
- Centrifugal
6: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Critical temperature
- Saturated temperature
- Wet bulb temperature
- Dry bulb temperature
7: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
8: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 88
- 116
- 108
- 38
9: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
10: A thermometer inside a duct measures ____ heat.
- latent
- hidden
- sensible
- specific
11: Liquid line filter-driers on a 410A system must be rated for no less than
- 1000 psig
- 600 psig
- 400 psig
- 200 psig
12: 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
13: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
14: A hotel is considered a _______ occupancy.
- mercantile
- residential
- commercial
- institutional
15: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
16: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 2 months
- 30 days
- 1 week
- 14 days
17: 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
18: Name three things that must be done when changing refrigeration lubricant?
- Place sign, check for leaks, insulate
- You can't change lubricants.
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
19: What is the minimum size wire you can use on a 30 amp circuit?
- 10 AWG
- 16 AWG
- 12 AWG
- 14 AWG
20: A single pole-double throw switch used how many wires excluding the ground wire?
- five
- two
- four
- three
21: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 7.25'
- 72"
- Ceiling height
22: While water is evaporated in an evaporative condenser the impurities which were in the water are
- blown to the atmosphere by the fan
- accumulate in the sump water
- remain in the air
- washed out of the air by the spray pump
23: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- B-2
- A-1
24: Usually dry bulb temperature is
- not important and shall be ignored
- higher than wet bulb temperature
- same as wet bulb temperature
- lower than dry bulb temperature
25: When an electronic bridge is in balance the bridge output will be
- 1 volt
- 15 volts
- 0 volts
- .01 volts