SSE JE Electrical Engineering 28 Oct 2020 Shift 1 Papers

Question : 125 of 200

Marks: +1, -0

Calculate the highest speed at which a 60 Hz alternator can be operated.

Solution:

f = 60 Hz
To get the maximum speed, the poles must be minimum.
Poles, P = 2

∴\N _{ \S }={120 \f }/{ \P }

={120×60}/2

= 3600 rpm

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