A 50 HZ alternator will run at the greatest possible speed if it is wound for ...... poles
A. 8
B. 6
C. 4
D. 2
Explanatory answer:
Ns=120F/P
Alternators always runs at synchronous speed and which is inversely proportional to no.of poles.
so lesser the poles higher the speed and the minimum possible no. of poles is 2
for P=2, Ns=3000 rpm
for P=4, Ns=1500 rpm
for P=6, Ns=1000 rpm
for P=8, Ns=750 rpm
The correct ans is P=2
A. 8
B. 6
C. 4
D. 2
Explanatory answer:
Ns=120F/P
Alternators always runs at synchronous speed and which is inversely proportional to no.of poles.
so lesser the poles higher the speed and the minimum possible no. of poles is 2
for P=2, Ns=3000 rpm
for P=4, Ns=1500 rpm
for P=6, Ns=1000 rpm
for P=8, Ns=750 rpm
The correct ans is P=2
thank you
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