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Answer :

By looking at Commutator part of the motor, it can be easily confirmed that a particular motor is D.C. motor.

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Description : 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

Answer : 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

Answer : The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

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Answer : The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

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