A light-sensing device used to control lighting fixtures in response to detected light levels is called a _________.
a. transfer switch
b. no-niche luminaire
c. dry-niche luminaire
d. photocell
d. photocell
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For the AFD operating frequency range shown in the figure above, the range of output frequencies over which the AFD output voltage remains constant while the frequency varies is identified in the figure as _____
a. A to C b. D c. B to C d. A to B
How can you determine the wire size that can be used effectively with an insulated barrel crimp connector?
a. It is the same as the bolt or screw size permitted. b. It is indicated by the color-coding of the insulation on the connector. c. It is referenced by catalog number. d. It is the largest size of wire you can fit into the barrel.
Technician A says that a valve spring's pressure may be 10% less than the manufacturer's specifications before it must be replaced. Technician B says that valve seating pressure is the amount of force that the valve spring exerts on the area of contact between the valve face and seat. Who is right?
A. ?Technician A only B. ?Technician B only C. ?Both A and B D. ?Neither A nor B
To calculate the volume of a circular column, use the formula _____
a. pi2 × radius × height b. pi × radius2 × height c. pi × radius × height2 d. pi × radius2 × height2