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DC Generators

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

Field
Load
Brushes
Armature

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DC Generators
The main factor which leads to unstable parallel operation of flat and over compounded generators is

their rising voltage characteristics
unequal number of turns in their series field windings
unequal speed regulation of their primemovers
unequal series field resistances

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

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

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DC Generators
The O. C. C. of a dc generator is also called its_______ characteristic.

External
No load saturation
Performance
Internal

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

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

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DC Generators
Shunt generators are most suited for stable parallel operation because of their

rising voltage characteristics
identical voltage characteristics
drooping voltage characteristics
linear voltage characteristics

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