ALTERNATOR 5
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
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
8
6
4
2
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
80
20
40
47. If an alternator winding has a fractional pitch of 5/6, the coil span is ______ degrees
300
150
30
60
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
-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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