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The speed of a D.C. motor can be controlled by varying

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The speed of a D.C. motor can be controlled by varying 

1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
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The speed of a D.C. motor can be controlled by varying 

1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

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