Answered: What will be the string efficiency of a…

What will be the string efficiency of a suspension type insulator which has 3 discs? The voltage across the string is 20kV and the voltage across the disc closer to the conductor is 9 kV.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter2: Basic Electricity

Section: Chapter Questions

Problem 25RQ: Which of the following is the best insulator? a. wood b. thermoplastic c. copper d. cast iron

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Concept explainers

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).

Question

What will be the string efficiency of a suspension type insulator which has 3 discs? The voltage across the string is 20kV and the
voltage across the disc closer to the conductor is 9 kV.
Select one:
O a. 58%
O b. 74%
O c. 95%
O d. 66%

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