Question

The rotor emf of 3 phase 6 pole 400 volt 50 hertz induction motor alternate at 3 years the speed of motor will be

Answer 1

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Option No. A

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Answer 2

Answer:

Concept:

An alternating current motor is simple to operate, but its speed varies depending on the size of the load or the amount of voltage supplied. Another type of motor can improve performance in applications where maintaining a constant speed is critical.

Explanation:

Formula for  motor rated speed

$(\mathrm{rpm})=120 \times \frac{\text { Freq }(\mathrm{Hz})}{P}$

where,

Freq = input power frequency

p = motor poles

By substituting the given values

motor speed = 120

$(\mathrm{rpm})=120 \times \frac {\ 50(\mathrm{Hz})}{6}$

         = 120 × 8.33

         = 1000

Hence the answer is 1000 rpm

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