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DC GENERATOR 2

Create an image of a DC generator in a workshop setting, showing various components like commutators, windings, and pole shoes, with a background of electrical schematics and diagrams.

DC Generator Fundamentals Quiz

Test your knowledge on DC generators with this engaging quiz! Dive into the world of electrical engineering and enhance your understanding of crucial concepts related to DC generators.

Key Topics Covered:

Insulating materials
Winding types
Commutation and polarity
Magnetic fields and armature reactions

10 Questions2 MinutesCreated by CoilingCircuit512

11. The insulating material used between the commutator segments is normally _________

Graphite

Paper

Mica

Insulating varnish

12. For generating large currents on D.C.generators, which winding is generally preferred?

progressive wave winding

Lap winding

Retrogressive wave winding

Wave winding

13. The polarity of a D.C.generator can be reversed by ____________

Reversing the field current

Increasing the field current

Reversing the field current as direction of rotationwell as the

Any of the above

14. Welding generator will have ____________

Lap winding

Wave winding

Delta winding

Duplex wave winding

15. In case of D.C.machine winding, number of commutator segments is equal to ________

Number of armature coils

Number of armature coil sides

Number of armature conductors

Number of turns

16. The function of pole shoes in the case of D.C.machine is _____________

To reduce the reluctance of the magnetic path

To spread out the flux to achieve uniform flux density

To support the field coils

To discharge all the above functions

17. The demagnetizing component of armature reaction in a D.C.generator __________

Reduces generator emf

Decreases armature speed

Reduces interpole flux density

Results in sparking trouble

18. Magnetic field in a self excited D.C.generator is produced by _____________

Electro magnet

permanent magnet

Bith A & B

All of the above

19. Compensating windings are used in generators ____________

Mainly to reduce the eddy currents by providing local short circuits

To provide path for circulation of cooling air

To neutralise the cross magnetising effect of the armature reacation

None of the above

20. In D.C.generators, lap winding is used for _____________

High voltage ,high current

Low voltage, high current

High voltage , low current

Low voltage, low current

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