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A six pole generotar with fixed field ex...

A six pole generotar with fixed field excitation developes an e.m.f. of `100 V` when operating at `1500` r.p.m. At what speed must it rotate to develop `120 V`?

A

1200 rps

B

1800 rps

C

1500 rpm

D

400 rpm

Text Solution

Verified by Experts

The correct Answer is:
B
By the relation, `(N_(1))/(N_(2))=(V_(1))/(V_(2))`
`therefore (1500)/(N_(2))=(100)/(120)implies N_(2) =(1500xx120)/(100)=1800`
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