Often times, an IC input label will contain an over-bar. In order for that particular input to perform a required function:
A) the input is active only on NGT. B) the input is active only on PGT.
C) the input needs to be high. D) the input needs to be low.
D
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Before the first fire is built in the fireplace, the fireplace should cure _____ after construction.
A. a minimum of 45 days B. at least 30 days C. no more than 2 weeks D. for 48 to 72 hours
Grasses that produce edible grains are called:
a. turf crops c. pulse crops b. fiber crops d. cereal crops
The two basic types of fans used in most air-handling units are:
A) Centrifugal and axial. B) Positive pressure and negative pressure. C) Reciprocating and orbital. D) Clockwise rotating and counterclockwise rotating.
What are ?voltages or currents that operate at a frequency that is a multiple of the fundamental power frequency?
A. ?pulsations B. ?loads C. ?phases D. ?harmonics