Why should the technician check the furnace door safety switch after installation?
A) to check the furnace interior for defects in the outgoing vents
B) to prevent the furnace from operating with the door removed
C) to test for furnace flashback
D) to sync it with the indoor blower
B
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If the joint is struck when the mortar is too hard, a black mark will appear on the surface of the joint, which is called _____ .
A. burning the joint B. joint fatigue C. charring the joint D. joint marking
Explain the use of reference arrow method for identifying sections.
What will be an ideal response?
To reverse the direction of rotation of the rotor, you would ____.
A. reverse the polarity of one of the fields B. reverse the polarity of both of the fields C. increase the operating frequency D. attach a permanent capacitor
Umbrella-type valve stem seals ________
A) Fit on the valve face to prevent combustion leaks B) Lock under the valve retainer C) Fit tightly onto the valve guide D) Fit tightly onto the valve stem