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ALTERNATOR 5

A detailed illustration of an alternator with labeled components, showing its internal mechanism and design, set against a technical background.

Alternator Mastery Quiz

Test your knowledge of alternators with our comprehensive quiz designed for electrical engineering enthusiasts. Challenge yourself with questions that cover key concepts, calculations, and design features of alternators.

Are you ready to enhance your understanding of:

Pitch factor
Armature reaction
Voltage regulation

10 Questions2 MinutesCreated by StudyingStar324

41. In an alternator, pitch factor is the ratio of the e.m.fs. of _________________

Full pitch winding to short pitch winding

Short pitch coil to full pitch coil

Distributed winding to full pitch winding

Full pitch winding to concentrated winding

42. In an alternator if the armature reaction produces demagnetisation of the main field, the power factor should be _______________

Unity

Zero , lagging load

Zero , leading load

None of the above

43. In an alternator, the frequency of voltage generated depends on _____________

Rotative speed only

No of poles only

Both a & b

None of the above

44.Salient pole type rotors as compared to cylindrical pole type are ___________

Small in diameter as well as axial length

Large in diameter as well as axial length

Smaller in diameter and larger in axial length

Larger in diameter and smaller in axial length

45. A 50-Hz alternator will run at the greatest possible speed of it is wound for ___ poles

46. The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is short-pitched by __________ degrees

140

47. If an alternator winding has a fractional pitch of 5/6, the coil span is ______ degrees

300

150

48. As load p.f. Of an alternator becomes more leading, the value of generated voltage required to give rated terminal voltage is______________

Increases

Remains unchanged

Decreases

Varies with rotor speed

49. The voltage regulation of an alternator having 0.75 leading p.f. load, no-load induced e.m.f. of 2400V and rated terminal voltage of 3000V _________ percent.

-20

150

-26.7

50. At leading power factor, the armature flux in an alternator __________

Distorts the rotor flux

Aids the rotor flux

Opposes the rotor flux

Does not affect the rotor flux

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