How many poles should the alternators, driven by the steam and gas turbines prime movers must have, for better operation?
A. fewer number of poles
B. large number of poles
C. medium number of poles
D. any of the mentioned
Answer:A
How many poles should the alternators, driven by the steam and gas turbines prime movers must have, for better operation?
A. fewer number of poles B. large number of poles C. medium number of poles D. any of the mentioned
Explanation: Steam and gas turbines have best operating characteristics at relatively high speeds, therefore, alternators driven by these must have a fewer number of poles, say 2 or 4, as f ∝ 1/N.