DC Motor or Direct Current Motor Multiple Choice Questions and Answers


1. The armature of DC machine is made up of laminated sheets to .......


   A.Reduce hysterisis loss

   B.Reduce the eddy-current loss

   C.Reduce armature copper loss

   D.Increase dissipation of heat from the armature surface


✔ View Answer


D.Reduce the eddy-current loss

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2. The function of a brush and commutator arrangement in a DC motor is .......


   A.To produce unidirectional torque

   B.To produce unidirectional current in the armature

   C.To help in changing the direction of rotation of the armature

   D.To reduce sparking


✔ View Answer


A.To produce unidirectional torque

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3. The emf induced in a coil rotating in a magnetic field is maximum when .........


   A.The rate of change of flux linkage by the coil is the maximum

   B.The rate of change of flux linkage by the coil is minimum

   C.The rate of change of cutting of flux by the coil-sides is minimum

   C.The flux linkage by the coil is maximum


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A.The rate of change of flux linkage by the coil is the maximum

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4. The maximum permissible operating temperature of class E insulating material is ......


   A.130 C

   B.180 C

   C.120 C

   D.105 C


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C.120 C

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5. The direction of rotation of a DC motor can be reversed .......


   A.By reversing the connections of both armature and the field winding with the supply

   B.By reversing the connections of either the armature or the field-winding connection with the supply

   C.By reducing the field flux

   D.By introducing an extra resistance in the armature circuit


✔ View Answer


B.By reversing the connections of either the armature or the field-winding connection with the supply

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