The PWM drive varies its __________ by changing the number of pulses and their widths.
A. RMS voltage
B. frequency
C. both a and b
Answer: C
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A ____ is formed in the internal corner of the angle formed by two pieces of metal.
A. bevel weld B. square weld C. V weld D. J weld E. none of the above
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The thread pitch of a bolt is measured in what units?
A) Millimeters B) Threads per inch C) Fractions of an inch D) Both A and B can be correct
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When copper is being brazed to steel _____
A) the technique is identical to brazing copper to copper B) more heat is applied to the steel fitting C) a filler metal with a high silver content is used D) a filler metal with a high phosphorus content is best
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____ timers change their contacts immediately when turned on.
a. Off-delay b. On-delay c. Switch d. Reactive
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