If a 6-pole induction motor operates on a 60 Hz supply, its synchronous speed is _____________.

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RRB JE EE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. 7200 rpm
  2. 1200 rpm
  3. 2400 rpm
  4. 3600 rpm

Answer (Detailed Solution Below)

Option 2 : 1200 rpm
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Detailed Solution

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Concept

The synchronous speed of an induction motor is given by:

\(N_s={120f\over P}\)

where, Ns = Synchronous speed

f = Frequency

P = No. of poles

Calculation

Given, P = 6

f = 60 Hz

\(N_s={120\times 60\over 6}\)

Ns = 1200 rpm

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