Topics: All categories in the pool
1: A normal operating evaporator temperature of R-22 for air conditioning is typically
- 32F
- 58F
- 45F
- 55F
2: one BTU equals
- 31.4 hp
- 3.41 hp
- Pi
- 12,000 hp
3: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- A-1
- B-2
- B-1
4: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe as you would measure it
- the total length of pipe as you would measure it plus 25% for fittigns
5: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- overcharge of oil
- plugged drier
- leaking discharge valves in the compressor
6: By using nitrogen within a pipe during brazing operation,
- Exterior scale formation is minimized
- Copper oxide formation is prevented
- The explosion hazard is confined
- Discoloration is prevented
7: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
8: 746 watts is equal to
- Pi
- 100 hp
- 10 hp
- 1 hp
9: Ohm's Law indicates Amps X Resistance = ___________.
- Current
- Impedance
- Volts
- Ohms
10: What is a high-side float?
- 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
- 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
- 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 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
11: Sublimation occurs when
- ice melts and turns to water
- gas is formed directly from a solid
- liquid is formed from a gas
- gas is formed from a liquid
12: Usually dry bulb temperature is
- higher than wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
- same as wet bulb temperature
13: Volts x amps equals
- Impedance
- Inductance
- Ohms Law
- Watts
14: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 550 lbs
- 330 lbs.
15: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
16: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
17: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
18: In a horizontal shell & tube condenser, the ammonia is liquefied by
- water sprayed over condenser
- removing the latent heat of vaporization
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
19: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UL”
- “UV”
- “U” or “UM”
- “UM” and “UV”
20: The location of a thermal bulb of a TXV affects
- the amount of liquid refrigerant in the evaporator
- the amount of liquid returning to the compressor
- the amount of liquid in the condenser.
- subcooling
21: "I" represents _______ in the Watt's law formula.
- amperage
- reactance
- voltage
- watts
22: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
23: What is NOT a positive displacement compressor.
- Rotary
- Scroll
- Centrifugal
- Reciprocating
24: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
25: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above