Melting alloy and bimetallic overload relays are designed to _____.
a. trip an alarm signal
b. keep the motor operating in the event of a sustained overload
c. react to changes in the motor load current
d. divert excessive current to prevent overheating
c. react to changes in the motor load current
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The National Electrical Code® requires that all switching be done in the __________ circuit conductor.
a. grounded b. grounding c. switch loop d. ungrounded
Thermocouples are made from two dissimilar metals
Indicate whether the statement is true or false
One purpose of the comparator in a digital-ramp ADC is to:
A) enable the control unit as long as Vax is greater than Va. B) generate clock pulses to up-count the binary counter. C) enable the control unit as long as Vax is less than Va. D) staircase the input analog for comparison with Vax.
Waviness width, roughness width, flaw, roughness height, and roughness width cutoff are all characteristics of ____.
A. casting surfaces B. surface finish characteristics C. machined surfaces D. both a and c E. none of the above