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The ELCB contacts open when they directly affected by: O a. search coil O b. phase coil O c. neutral coil O d. trip coil

The ELCB contacts open when they directly affected by: O a. search coil O b. phase coil O c. neutral coil O d. trip coil

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 8RQ
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give the correct answers to the questions given in the images provided.

The ELCB contacts open when they directly affected by: a. search coil O b. phase coil O c. neutral coil O d. trip coil
Transcribed Image Text:The ELCB contacts open when they directly affected by: a. search coil O b. phase coil O c. neutral coil O d. trip coil
When controlling a lamp by a step relay, the lamp is connected as follows: O a. one of its terminals is connected to phase line, the other terminal is connected to the pushbutton. O b. one of its terminals is connected to a point of the relay contacts, the other terminal is connected to neutral. O c. one of its terminals is connected to the coil of the relay, the other terminal is connected to phase line. O d. one of its terminals is connected to the pushbutton, the other terminal is connected to neutral. We can use normally closed pushbuttons instead of normally open pushbuttons when controlling lamps by step relay. a. False. O b. True
Transcribed Image Text:When controlling a lamp by a step relay, the lamp is connected as follows: O a. one of its terminals is connected to phase line, the other terminal is connected to the pushbutton. O b. one of its terminals is connected to a point of the relay contacts, the other terminal is connected to neutral. O c. one of its terminals is connected to the coil of the relay, the other terminal is connected to phase line. O d. one of its terminals is connected to the pushbutton, the other terminal is connected to neutral. We can use normally closed pushbuttons instead of normally open pushbuttons when controlling lamps by step relay. a. False. O b. True
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