Topics: All categories in the pool
1: In an electrical circuit, what is potential measured in?
- Herys
- Ohms
- Volts
- Amps
2: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- inlet of the low temperature evaporator.
- outlet of low temperature evaporator
- outlet of the liquid line
3: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- Low side float
- TXV
- High side float
4: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 12,000 BTU
- 970 BTU
- 144 BTU
- 24,000 BTU
5: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
6: Pressure is equivalent of
- Area X Force
- Force
- Force / Area
- Force X Area
7: One atmosphere equals
- 0 psia
- 14.7
- 29.4
- 0 psig
8: How many forces operate a thermostatic expansion valve?
- 3
- 4
- 2
- 1
9: A start capacitor is wired in _____ with the start windings.
- series-parallel
- parallel
- junction
- series
10: What refrigerant doesn't have to be classified?
- R-422A
- R-718
- R-134A
- R-717
11: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
12: Pi equals approximately
- 3.41
- 12,000
- 3.14
- 746
13: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- R-718
- methyl chloride
- ammonia
- trichlorotrifluoromethane
14: 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
15: The density of a gas refers to
- pounds per cubic foot
- cubic feet per pound
- pounds per square foot
- pounds per absolute pressure
16: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 75
- 15
- 50
- 20
17: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Aluminum
- Magnesium
- Copper
18: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 330
- 6.6
- 110
19: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- lower
- there is no Group B1 refrigerants
- the same
20: Halogen refrigerants are corrosive to which type of metal?
- black iron
- magnesium
- stainless steel
- copper
21: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 1
- 5
22: In a motor, an internal overload might open if
- there's a direct short
- there's an open start winding
- there was a high pressure refrigerant was used for a low pressure system.
- there's an excess current draw through the motor
23: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
24: The difference between saturated liquid and saturated vapor is
- heat
- pressure
- volume
- temperature
25: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 22
- 50
- 25