DC Generators – Exercise – 1

DC Generators » Exercise – 1

1. The armature of D.C. generator is laminated to :

(a) reduce the bulk
(b) provide the bulk
(c) insulate the core
(d) reduce eddy current loss

2. The field coils of D.C. generator are usually made of :

(a) mica
(b) copper
(c) cast iron
(d) carbon

3. In D.C. generators the pole shoes are fastened to the pole core by :

(a) rivets
(b) counter sunk screws
(c) brazing
(d) welding

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

(a) severe sparking
(b) rough commutator surface
(c) imperfect contact
(d) any of the above

5. 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. ?

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

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