The ____ permits the use of intrinsically safe systems in areas that contain hazardous vapors.
a. NEMA
b. NEC
c. IEEE
d. UL
b. NEC
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Technician A says that the stripe on a diode indicates the cathode end of the diode. Technician B says that the arrow on the schematic symbol for a diode indicates the direction of conventional current flow to forward-bias the diode. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
____________________ are used in some applications to prevent a pin, such as a piston pin, from sliding out of position.
Fill in the blank(s) with the appropriate word(s).
The addition of a vernier scale on the barrel of a 0.01-millimeter micrometer increases the degree of precision of the instrument to 0.002 millimeter.
Answer the following statement true (T) or false (F)
The high-strength steel cables used in posttensioned concrete construction are called _____
a. stringers b. bands c. tendons d. stays