Read Out “Electrical DC Motors” topic to better understand all those questions

1) What is the principle operation of DC Motors?

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2) What is back e.m.f in a DC motor?

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3) Why is shaft torque less than armature torque in a DC motor?

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4) Why series motor cannot be started on no-load?

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5) In a generator, the main flux is distorted in the direction of rotation due to armature reaction. Why is it distorted in the opposite direction of rotation in a DC motor?

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6) What is speed regulation?

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7) How can we control the speed of a DC shunt motor?

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8) How can we control the speed of a DC series motor?

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9) Why is DC motor current so high?

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10) What is the chief advantage of a DC series motor?

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