51) Find the number of cycles per second of a 6 pole alternator, running at 1000 rpm.

52) An alternator is running at a speed of 1500 rpm, at the frequency of 50 Hz, calculate the number of poles ?

53) In alternator the factor by which the full pitch voltage is multiplied to get voltage generated in fractional pitch is called as :

54) Calculate the percentage voltage regulation of the alternator, when it's terminal voltage rises from 210 volt at full load to 220 volt at no load.