Topics: All categories in the pool
1: The density of a gas refers to
- pounds per cubic foot
- pounds per square foot
- pounds per absolute pressure
- cubic feet per pound
2: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Circuit Breaker
- T&P device
- Relief valve
- Temperature limiter device
3: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- commercial occupancy
- public assembly occupancy
4: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
5: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- orange
- red
- blue
- green
6: What is the refrigerant chlorodifluoromethane?
- R-123
- R-12
- R-22
- R-134a
7: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- R-718
- methyl chloride
- trichlorotrifluoromethane
- ammonia
8: A class A3 refrigerant is considered
- non-toxic but highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic and non-flammable
9: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 70F
- 58F
- 77F
- 32F
10: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
11: What device should be used on low-temperature freezers?
- hot-gas by-pass
- high capacity TXV
- discharge muffler
- oil separator
12: An example of an "Expendable Refrigerant" is
- liquid nitrogen
- liquid oxygen
- lithium bromide
- ammonia
13: High pressure controls should be set no higher than
- 10% of set point
- 80% of set point
- 90% of set point
- 25% of set point
14: 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
15: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
16: B3 refrigerants are considered
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic and highly flammable
17: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to evaporate
- the temperature of air of 50% RH
- the temperature below which water vapor in the air will start to condense
18: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's water
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
19: Pressure is equivalent of
- Force X Area
- Force
- Force / Area
- Area X Force
20: A start capacitor is wired in _____ with the start windings.
- junction
- series
- series-parallel
- parallel
21: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- pressure relief device
- low limit control
- zone valve
22: How are a compressor and condenser fan wired?
- series-parallel
- series
- parallel-series
- parallel
23: Electricity involves the movement of electrons in atoms
- True
- False
24: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
25: 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)?
- centrifugal switch
- printed circuit board (PCB)
- motor starter
- duel-voltage switch