What are some devices that are responsible for harmonics?
What will be an ideal response?
Harmonics on single-phase power lines are generally caused by devices such as computer power supplies, electronic ballasts in fluorescent lights, triac light dimmers, and so on. Three-phase harmonics are generally produced by variable-frequency drives for AC motors and electronic drives for DC motors. A good example of a pulsating load is one that converts AC current into DC and then regulates the DC voltage by pulse-width modulation. Many regulated power supplies operate in this manner.
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The accompanying figure shows the parts of a box cornice. What is feature 8?
A. Cornice return B. Fascia C. Soffit D. Vent
Electrical insulation is classified by the ________ stability of the materials that are used for the winding
A) voltage B) temperature C) current D) pressure
What is a field weld?
What will be an ideal response?