DC GENERATOR 5
Master D.C. Generators Quiz
Test your knowledge on D.C. generators with our engaging quiz designed for electrical engineering enthusiasts! This quiz covers various aspects of D.C. generators including types of windings, armature reactions, and efficiency conditions. Perfect for students or professionals looking to solidify their understanding.
- 10 challenging questions
- Multiple-choice format
- Immediate feedback on your answers
41. For a 4-pole, 2-layer, D.C.lap winding with 20 slots, a number of commutator bars is ____________.
20
40
80
160
42. A 4-pole, 12 slots lap wound D.C.armature has 2 coil sides per slot. Assume progressive winding, the back pitch would be __________.
5
7
3
6
43. The series field of a short shunt D.C.compound generator is excited by _____ current.
Shunt field
Armature
Load
External
44. In a 12-pole triplex lap-wound D.C.armature, each conductor (parallel path) can carry a current of 100A. The rated current of this armature is ___________.
600A
1200A
2400A
3600A
45. The commercial efficiency of a shunt generator is maximum when its variable loss equals ____________ loss.
Constant
Copper
Iron
Friction and windage
46. In D.C.generators, armature reaction is produced actually by __________.
Its field current
Armature conductors
Field pole winding
Load current in armature
47. In a 6-pole D.C.machine, 90 mechanical degrees correspond to __________ electrical degrees.
30
180
45
270
48. For the voltage built-up of a self-excited D.C.generator, which of the following is not an essential condition?
There must be some residual flux
Field winding mmf must aid the residual flux
Total field circuit resistance must be less than the critical value
Armature field must be very high
49. Which of the following D.C.generator cannot build up on open circuit?
Shunt
Series
Short shunt
Long shunt
50. If field resistance of a D.C.shunt generator is increased beyond its critical value, the generator ______________.
Output voltage will exceed its name-plate rating
Will not build up
May burn out if loaded to its name plate rating
. Power output may exceed its name plate rating
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