What is a hazard of push buttons?
What will be an ideal response?
Because push buttons employ a spring to return the contact to their normal position, if a person's finger slips off the jog button, it is possible for the spring to reestablish connection with the normally closed contacts before the holding contact has time to reopen. This would cause the motor to continue running instead of stopping. In some cases, this could become a significant safety hazard.
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Winter presents a ________, where heat must be added for comfort.
A) Heating load B) Heavy load C) Warm trend D) Cooling load
The installation of resistors and reactors is covered in _____.
a. NEC Article 450 b. NEC Article 460 c. NEC Article 470 d. NEC Article 480
____ is the conscious decision on the part of the designer to produce a product that will become outdated in a defined time frame.
A. Durability B. Planned obsolescence C. Post-structuralism D. Automatic safety factor
Why are powers of 10 used to express numeric values in scientific and engineering work?
What will be an ideal response?