Which of the following is NOT true regarding optical sensors?
A) Optical sensors use LEDs and a photo transistor
B) Optical sensors generate a digital signal
C) Optical sensors used as speed sensors only have four windows
D) All of these are true statements
C
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Explain a floating fastener assembly.
What will be an ideal response?
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a. 50 psig b. 100 psig c. 125 psig d. 225 psig
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________ concrete allows water to pass through to the ground
A) Pervious B) Porous C) Portland D) Air-entrapped
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For a welder qualification test, plate thicker than 3/8" (1.6 to 10 mm) thick requires _____
a. a face bend and a root bend b. two side bends c. two side bends and two root bends d. two face bends and two root bends
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