Chapter 3 D.C. MACHINE AS A MOTOR MCQs

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1. . An electrical motor is a machine which converts;





2. . The construction of d.c motor is;





3. . The DC motor can be identified by looking at this part;





4. . The mechanical force developed by a d.c. motor is given by;





5. . The direction of mechanical force produced in a DC motor can be determined by;





6. . Flemingā€™s left-hand rule is used for;





7. . The speed of d.c. motor is directly proportional to;





8. . Back e.m.f. is induced in;





9. . At the time of starting, the back e.m.f. of d.c. motor is;





10. . Back e.m.f. of d.c. motor;





11. . The formula to find back e.m.f. of d.c. motor is;





12. . At the time of starting, the current of d.c. motor is high because of;





13. . Back e.m.f. of d.c. motor depends upon;





14. . In the presence of back e.m.f., motor current will be;





15. . The back e.m.f. of a d.c. motor;





16. . If the speed of d.c. motor is decreased, armature current will be;





17. . A d.c. motor can be used as;





18. . In a d.c. motor, unidirectional torque is produced with the help of;





19. . Formula to obtain armature current of d.c. motor is;





20. . The current drawn by a 120V d.c. motor of armature resistance 0.5ā„¦ and back e.m.f. 110 V is .......... ampere.





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