How does negative pressure affect the air supply of a furnace?
A) It causes little noticeable changes to a furnace. B) It increases the furnace's need for gas.
C) It causes a need for less outside air. D) It increases the need for outside air.
D
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________: program designed to reduce acreage in production, reduce erosion and improve water quality.
Fill in the blank(s) with the appropriate word(s).
Which device may be useful for testing hall effect sensors?
A) Test light B) Logic probe C) Either A or B D) Neither A nor B
After being energized, what type of function could a typical relay with normally closed contacts directly
perform? a. De-energize a crankcase heater b. Energize an inducer motor c. Start a compressor d. Complete a circuit to a motor start winding
The d'Arsonval meter movement is operated by applying _____ current to the coil.
A. AC B. DC