Question

A)
$given \: \: scientific \: \: reasons$
:- the alternating current it is a vibrating current
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Answer 1

Answer:

Connection to Power Supply.

Alternating voltage supply is now usual, but polyphase a.c. supply is commonly used for larger motors and heat-treatment equipment. This leads to advantages in both generation and transmission and the flow of power is more uniform than with single-phase a.c. Motors can have more rugged design and more uniform torque. A three-phase system is perhaps the most usual apart from single-phase. Current and voltage in the separate phases operate individually. With balanced polyphase systems power supplied is equal in all phases. Switching on and off, and overcoming mechanical inertia, are both made easier by their use.

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