Chapter 3 MOTORS GENERATORSAND TRANSFORMER MCQs

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1. . When a conductor cuts magnetic flux, e.m.f induces in it, by:





2. . DC generator works on ___ principle:





3. . The salient-pole construction for field structure of an alternator is generally used for ……….machine.





4. . A 10 pole AC generator rotates at 1200 rpm. The frequency of AC voltage in cycles second will be:





5. . The e.m.f induced in the dc generator armature winding is:





6. . Commutator in DC generator is used for:





7. . A DC generator without commutator is a:





8. . In DC machine yoke offers:





9. . Which of the following bearings and their uses are correct?





10. . A transformer is designed to be operated on both 50 & 60 Hz frequency. For the same rating, which one will give more output; when:





11. . A Step-Up Transformer which has 110/220 turns. What would happen if we replace it with 10/20 turns? (Because Turns ratio would be same in both cases)





12. . The rating of transformer may be expressed in ____________.





13. . What will happen if the primary of a transformer is connected to D.C supply?





14. . A Step Up transformer _____________.





15. . In Single Phase Transformer, The Primary Current and Primary Voltage is 4.55 and 11kV respectively. The Rating of the transformer would be________?





16. . In a split phase motor, the running winding should have:





17. . If the capacitor of a single-phase motor is short-circuited:





18. . In a split phase motor:





19. . The torque developed by a single-phase motor at starting is:





20. . In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to:





21. . In repulsion motor direction of rotation of motor:





22. . If a particular application needs high-speed and high starting torque, then which of the following motor will be preferred?





23. . Which of the following motor is used in the mixer?





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