A potentiometer is a __________ feedback device.
A. position
B. velocity
C. both a and b
Answer: A
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NEMA and IP classify pull and junction boxes according to the _____.
a. type of material used for construction b. size of cable allowed c. size of the box d. degree of protection from the elements they provide
What should happen when a security monitoring device is activated? Select all that apply.
A) The event should be recorded. B) The event should be annunciated in an appropriate way. C) There should be a telecon to the local fire department.
The synchronous speed at which a four-pole, 60Hz induction motor operates is _____.
a. 1,140 rpm b. 1,800 rpm c. 2,500 rpm d. 6,900 rpm
If a schematic diagram shows a clear path from L1 to L2, without passing through any load, then what condition exists in the circuit?
A) Feedback B) Short circuit C) Normal condition D) Open circuit