What does a roll-out switch do?
A) checks to make sure the blower has not rolled out of position on the unit
B) shuts of the gas valve if flames are sensed outside the combustion area
C) allows the combustion components to be rolled out of the combustion chamber
D) insures proper clearance between the furnace and nearby walls
B
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How may the weather, climate, and season during which the project is to be constructed affect the overhead costs?
What will be an ideal response?
The clamping action of frictional material in the rotating disc or rotor creates heat.
Answer the following statement true (T) or false (F)
When a VAV box on a constant-air-volume system throttles air into the conditioned area:
A) The compressor and blower both slow down to match. B) The blower slows down to reduce overall airflow. C) The compressor slows down to match it. D) The excess air dumps into the area above the ceiling.
If a circuit with a source of 200 volts is connected across four parallel 50-ohm resistors, the current through
each resistor is _____. a. 1 amps b. 2 amps c. 3 amps d. 4 amps