Electrical Engineering Questions And Answers :: Dc Generators: part1

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Electrical Engineering : Dc Generators QUESTIONS AND ANSWERS :: part1 : 11 to 15

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2014 and IES 2014 examinations :

11.Brushes of D.C. machines are made of

carbon
soft copper
hard copper
all of above

12.The bearings used to support the rotor shafts are generally

ball bearings
bush bearings
magnetic bearmgs
needle bearings

13.For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

Lap winding
Wave winding
Either of (a) and (b) above
Depends on other features of design

14.In D.C. generators, the cause of rapid brush wear may be

severe sparking
rough commutator surface
imperfect contact
any of the above

15.In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be

4
8
16
32

More Dc Generators QUESTIONS AND ANSWERS available in next pages

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