DC Motors - Interview Questions | Exam2Win

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16. In D.C. shunt motors as load is reduced

A. the speed will increase abruptly

B. the speed will increase in proportion to reduction in load

C. the speed will remain almost/constant

D. the speed will reduce

Explanation: ANSWER : : the speed will remain almost/constant Explanation :

17. If a D.C. motor is connected across the A.C. supply it will

A. run at normal speed

B. not run

C. run at lower speed

D. burn due to heat produced in the field winding by .eddy currents

Explanation: ANSWER : : burn due to heat produced in the field winding by .eddy currents Explanation :

18. In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be

A. almost negligible

B. rated full-load current

C. less than full-load current

D. more than full-load current

Explanation: ANSWER : : more than full-load current Explanation :

19. Differentially compound D.C. motors can find applications requiring

A. high starting torque

B. low starting torque

C. variable speed

D. frequent on-off cycles

Explanation: ANSWER : : low starting torque Explanation :

20. The speed of a D.C. shunt motor more than its full-load speed can be obtained by

A. decreasing the field current

B. increasing the field current

C. decreasing the armature current

D. increasing the armature current

Explanation: ANSWER : : decreasing the field current Explanation :