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What is the minimum frequency accepted for the motor, used in current production of high frequency induction furnace?

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in Casting-Forming-Welding II by (119k points)
What is the minimum frequency accepted for the motor, used in current production of high frequency induction furnace?

(a) 430 cycles/second

(b) 500 cycles/second

(c) 550 cycles/second

(d) 600 cycles/second

The question was asked in my homework.

Query is from Induction Furnace topic in division Metal Furnace and Practice of Casting-Forming-Welding II

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The correct option is (b) 500 cycles/second

For explanation I would say: In high frequency induction furnace, motors which are equipped for the production of high frequency current can have a minimum frequency of 500 cycles every second.

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