Cylinders made of ____ have the least weight and when properly maintained, last a long time.

a. Nikasil
b. aluminum
c. cast-iron
d. chrome


b. aluminum

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The accompanying figure shows an assortment of mechanical symbols. What is the symbol at the bottom?

A. Rectangular ceiling diffuser B. Round ceiling diffuser C. Flexible connection D. Transition

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If pulsed DC current is not present in the flame rod, what is the effect on the gas valve in a direct spark-ignition system?

A) The system will shut down. B) The valve will open. C) Pulsed DC current has no effect on the gas valve. D) The valve will remain closed.

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Most vehicle and tire manufacturers recommend that no more than ________ ounce balance weight be added to a wheel/tire assembly

A) 4.5 B) 3.5 C) 5.5 D) 2.5

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New crawl access, new vents, and new hold down and connectors required for lateral bracing should be represented on the _____.

A. interior elevations B. exterior elevations C. foundation plan D. framing plan

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