List two ways in which ambient light is rejected by a photoelectric system.

What will be an ideal response?


Use a polarized filter.
Modulate the transistor.

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When installing 4' × 8' subfloor panels, how far should you measure in from one side of the rim joist?

a. 2' b. 4' c. 6' d. 8'

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The longest side of a right triangle is 20 feet and the shortest side is 12 feet. How long is the third side?

a. 14 feet b. 15.5 feet c. 16 feet d. 19 feet

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This type of seal is used for heavy machinery where some leakage is permissible.

a. packing b. labyrinth seal c. O-ring seal d. felt or wool seal

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How many 2" pipes can be sourced by a 3" pipe allowing for friction?

Fill in the blank(s) with the appropriate word(s).

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