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Dc Generators QUESTIONS AND ANSWERS

Electrical Engineering : Dc Generators QUESTIONS AND ANSWERS :: part3 : 16 to 20

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except

interpoles

dummy coils

compensating winding

shifting of axis of brushes

17.To avoid formation of grooves in the commutator of a D.C. machine

the brushes of opposite polarity should track each other

the brushes of same polarity should track each other

brush position has no effect on the commutator grooving

the brushes of opposite polarity should track each other

18.In D.C. generators the polarity of the interpoles

is the same as that of the main pole ahead

is the same as that of the immediately preceding pole

is opposite to that of the main pole ahead

is neutral as these poles do not play part in generating e.m.f.

19.A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly

150 V

175 V

240 V

290 V

20.A cumulatively compounded long shunt generator when operating as a motor would be

cumulatively compounded long shunt

differentially compounded long shunt

cumulatively compounded short shunt

differentially compounded short shunt

More Dc Generators QUESTIONS AND ANSWERS available in next pages