# D.C. Generators Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “D.C. Generators Mcqs”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate D.C. Generators Mcqs comprehensively.

## 1. A separately excited generator as compared to a self-excited generator_____________?

Is amenable to better voltage control

Is more stable

Has exciting current independent of load current

Has all above features

## 2. In a four-pole D.C. machine____________?

All the four poles are north poles

Alternate poles are north and south

All the four poles are south poles

Two north poles follow two south poles

## 3. In lap winding, the number of brushes is always_____________?

Double the number of poles

Same as the number of poles

Half the number of poles

Two

Ball bearings

Bush bearings

Magnetic bearmgs

Needle bearings

## 5. In D.C. generators, the cause of rapid brush wear may be___________?

Severe sparking

Rough commutator surface

Imperfect contact

Any of the above

## 6. 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

## 7. Copper brushes in D.C. machine are used_____________?

Where low voltage and high currents are involved

Where high voltage and small cur-rents are involved

In both of the above cases

In none of the above cases

Current

Voltage

Speed

None of above

## 9. Fleming’s right-hand rule regarding direction of induced e.m.f., correlates__________?

Magnetic flux, direction of current flow and resultant force

Magnetic flux, direction of motion and the direction of e.m.f. induced

Magnetic field strength, induced voltage and current

Magnetic flux, direction of force and direction of motion of conductor

## 10. In D.C. generators the pole shoes are fastened to the pole core by_____________?

Rivets

Counter sunk screws

Brazing

Welding

## 11. While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?

Direction of induced e.m.f.

Direction of flux

Direction of motion of the conductor if forefinger points in the direction of generated e.m.f.

Direction of motion of conductor, if forefinger points along the lines of flux

## 12. According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?

Motion of conductor

Lines of force

Either of the above

None of the above

## 13. In a commutator_____________?

Copper is harder than mica

Mica and copper are equally hard

Mica is harder than copper

None of the above

Mica

Copper

Cast iron

Carbon

## 15. The resistance of armature winding depends on

Length of conductor

Cross-sectional area of the conductor

Number of conductors

All of the above

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