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DC Motors - Interview Questions and Answers

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1. In a D.C. shunt motor, speed is
A. independent of armature current
B. directly proportional to the armature current
C. proportional to the square of the current
D. inversely proportional to the armature current
Explanation: ANSWER : : independent of armature current Explanation :
2. To get the speed of D.C, motor below the normal without wastage of electrical energy is used.
A. Ward Leonard control
B. rheostatic control
C. any of the above method
D. none of the above method
Explanation: ANSWER : : Ward Leonard control Explanation :
3. According to Fleming's left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of
A. current in the conductor aovtaat of conductor
B. resultant force on conductor
C. none of the above
D. current in the conductor aovtaat of conductor
Explanation: ANSWER : If the field of a D.C. shunt motor gets opened while motor is running Explanation :
4. In case of D.C. shunt motors the speed is dependent on back e.m.f. only because
A. back e.m.f. is equal to armature drop
B. armature drop is negligible
C. flux is proportional to armature current
D. flux is practically constant in D:C. shunt motors
Explanation: ANSWER : : flux is practically constant in D:C. shunt motors Explanation :
5. A D.C. series motor is that which
A. has its field winding consisting of thick wire and less turns
B. has a poor torque
C. can be started easily without load
D. has almost constant speed
Explanation: ANSWER : : has its field winding consisting of thick wire and less turns Explanation :
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