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DC Generators

DC Generators
The critical resistance of the D.C. generator is the resistance of

Load
Armature
Brushes
Field

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DC Generators
The purpose of providing dummy coils in a generator is

To amplify voltage
To reduce eddy current losses
To provide mechanical balance for the rotor
To enhance flux density

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DC Generators
Carbon brushes are used in a dc machine because _______

Carbon lubricates and polishes the commutator
Carbon is cheap
Contact resistance is decreased
None of the listed here

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DC Generators
In a short shunt compound wound generator, the shunt field is connected in parallel with

Series combination of armature and series field
Parallel combination of armature and series field
Armature
Series field

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DC Generators
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave

will be of 5 Hz
will be zero
will be of 5 xiVHz
will be of v Hz 5

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DC Generators
The voltage drop for which of the following types of brush can be expected to be least?

Metal graphite brushes
Graphite brushes
Carbon brushes
None of these

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