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DC Generators

DC Generators
______ dc machine are most common.

8 pole
4 pole
6 pole
2 pole

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DC Generators
In a D.C. generator the critical resistance refers to the resistance of

Field
Brushes
Load
Armature

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DC Generators
The armature of a dc machine having 10 poles is rotating at a speed of 10 revolution per second. The number of hysteresis loops formed per second is ______

150
10
100
50

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DC Generators
The field winding of a dc shunt machine usually caries _______ of the rated current of the machine.

Less than 0.5 %
2% to 5%
More than 20%
15 to 25%

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DC Generators
The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except

Field weakening due to armature reaction and armature
Armature resistance drop
Armature reaction
Commutation

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DC Generators
Current versus time graph for an ideal commutation is a

None of the listed here
Hydrobola
Straight line
Parabola

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