A four pole 1200 RPM alternator will generate emf at a frequency of :
A25 Hz
B40 Hz
C50 Hz
D60 Hz
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ആർട്ടിക് മേഖലയിലെ ഇൻഡ്യയുടെ ആദ്യ പര്യവേഷണ കേന്ദ്രം ഏത് ?
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