Which of the following is a step in the typical lockout/tagout procedure for a compressor?
A. Depressurize the compressor.
B. Use an inert gas to purge the compressor case of air.
C. Place ancillary lubricating and seal oil systems into operation.
D. Drain the compressor’s case or cylinders to remove any liquid.
A. Correct. Depressurize the compressor during lockout/tagout.
B. Incorrect. Depressurize the compressor during lockout/tagout.
C. Incorrect. Depressurize the compressor during lockout/tagout.
D. Incorrect. Depressurize the compressor during lockout/tagout.
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a. NEC Article 250 b. NEC Article 386 c. NEC Article 392 d. NEC Article 440
Where more than one ground rod, pipe, or plate is used, the grounding electrodes must be at least __________ feet apart.
a. 4 b. 8 c. 10 d. None of the above
____ are comprehensive, precisely detailed drawings prepared for use by shop workers in fabricating precast concrete products and the metal connectors they contain.
A. Engineering drawings B. Shop drawings C. Engineer's sketches D. Checkprints
Complete the following exercises in complex arithmetic.
a. Find the complex conjugate of (4 +j 4), (2 ?j 8), (?5 + j 2).
b. Multiply the numerator and denominator of each ratio by the complex conjugate of the denominator. Use the result to express each ratio in polar form.
c. Convert the numerator and denominator of each ratio in part b to polar form. Use the result to express each ratio in polar form.