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DC Generators

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

Load
Armature
Field
Brushes

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DC Generators
The coupling field between electrical and mechanical systems of a dc machine is ______

Magnetic field
None of the listed here
Electric field
Both electrical and magnetic fields

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DC Generators
In case of D.C. machine winding, number of commutator segments is equal to

Number of armature conductors
Number of armature coils
Number of armature turns
Number of armature coil sides

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DC Generators
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be

Small
High
The same as rated voltage
Zero

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DC Generators
The armature core of a D.C. generator is usually made of

Copper
Silicon steel
Cast-iron
Nonferrous material

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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 ______

10
150
100
50

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