When installing an oil-fired furnace in a confined space with a firing rate of 100,000 Btuh, what is the minimum free air opening required if the combustion air vents are directly communicating with the outside?

A) 100,000/1,000 = 100 sq in for each grille B) 100,000/5,000 = 20 sq in for each grille
C) 100,000/4,000 = 25 sq in for each grille D) 100,000/2,000 = 50 sq in for each grille


B

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____ law states that an induced voltage or current opposes the motion that causes it.

a. Edison’s b. Brush’s c. Fleming’s d. Lenz’s

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General section lines ____.

A. are evenly spaced B. are also the coded section lines for cast iron C. are not commonly used D. both a and b E. none of the above

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Hogs are smarter than dogs or cats.

Answer the following statement true (T) or false (F)

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Technician A says that a discharged battery (lower than normal battery voltage) can cause solenoid clicking. Technician B says that a discharged battery or dirty (corroded) battery cables can cause solenoid clicking. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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