Topics: All categories in the pool
1: One atmosphere equals
- 29.4
- 0 psig
- 0 psia
- 14.7
2: 1 HP = ____ Watts?
- 3.1416
- 746
- 11,239
- 3,412
3: An electronic bridge circuit is basically a
- suspension
- Wheatstone
- high voltage circuit
- 24 volt control circuit
4: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- Pumpdown procedures are not allowed with systems containing liquid recievers
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- release the charge when the pressure exceeds 310 psig or higher
5: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 18
- 48
- 24
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
- purge
- merge
- surge
- splurge
7: What is not a requirement of a class T machine room?
- self-closing doors
- automatic ventilation
- fire hose connection to the building fire protection system
- tight fitting doors
8: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- far apart or little difference
- nearly the same
- a ling psychrometer doesn't have two theremometers.
9: A hissing noise at the expansion valve is a good indication that
- nothing is passing thru
- expansion valve is oversized
- gas is passing thru it
- liquid is passing thru it
10: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- printed circuit board (PCB)
- duel-voltage switch
- centrifugal switch
- motor starter
11: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
12: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 40'
- At least 30'
- There is no minimum for relief valve and windows.
- At least 20'
13: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- weak solution
- strong solution
- diluted solution
14: Most CFC's are
- inert
- flammable
- toxic
- inert but toxic
15: What is the minimum height refrigeration piping should be placed against walls?
- Ceiling height
- 7.25'
- 72"
- 6'
16: By using nitrogen within a pipe during brazing operation,
- Exterior scale formation is minimized
- Discoloration is prevented
- The explosion hazard is confined
- Copper oxide formation is prevented
17: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
18: Pressure is the equivalent of
- force
- area times force
- force times area
- force per unit area
19: A run capacitor is wired in series with the _____ windings.
- start capacitor
- run
- common
- start
20: What type of relief valve is used on a CO2 system?
- fusible plug
- gate valve
- glove disc
- rupture disc
21: What would be the classification of a church?
- Industrial
- Place of assembly
- Large mercantile
- Institutional
22: Pipe identification labels are required when the system contains more than
- 55 lbs
- 110 lbs
- 120 lbs
- 65 lbs
23: The oil separator is always inserted in the system
- in the discharge line
- to prevent oil logging
- where it can be easily serviced
- in a cool spot
24: Which of the following is NOT a positive displacement compressor?
- reciprocating
- scroll
- centrifugal
- screw
25: 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