What opens and closes the valves in a reciprocating compressor?
A) Pressure difference across the valves B) Hydraulic valve lifters
C) A cam shaft D) The piston pushes them open.
[Ques. 2] Direct-expansion coils operating below the dew point of the entering airstream will:
A) Warm the water vapor (humidity) in the air and condense it as droplets on the coil.
B) Cool the water vapor (humidity) in the air and expand it as droplets on the coil.
C) Cool the water vapor (humidity) in the air and condense it as droplets on the coil.
D) Expand the water vapor (humidity) in the air and condense it as droplets on the coil.
[Ques. 3] Where is the suction accumulator located?
A) On the low side just after the metering device B) On the high side just after the compressor
C) On the high side just after the condenser D) On the low side just before the compressor
[Ques. 4] What color surface temperature can be read most accurately with an infrared thermometer?
A) Light-colored, dull surfaces are best because they will radiate infrared light instead of absorbing it.
B) The closest to a flat black
C) Shiny surfaces work best because they reflect infrared light better.
D) Infrared thermometers are not affected by the color of the surface being measured.
[Ques. 5] Optional components found on the low side of a refrigeration system include:
A) Suction line filter, accumulator, and evaporator pressure regulator.
B) Discharge line muffler, oil separator, liquid receiver, and liquid line filter-drier.
C) Suction to liquid heat exchanger, economizer, and oil level regulator.
D) All optional components can be used on the low side of the system.
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