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D.C. Machines & Batteries MCQs – DAE Electrical Engineering

50 Score: 0 Attempted: 0/50
1. The main function of the commutator in a DC machine is to:




2. The armature of a DC generator is placed in the:




3. In a DC shunt generator, the field winding is connected:




4. The efficiency of a DC generator is maximum when:




5. Which law determines the direction of induced EMF?




6. The speed of a DC shunt motor is nearly:




7. The unit of magnetic flux is:




8. In a DC series motor, torque is proportional to:




9. The type of DC generator used for battery charging is:




10. The function of interpoles in a DC machine is to:




11. The brush material used in DC machines is usually:




12. The main cause of armature reaction is:




13. The EMF equation of a DC generator is:




14. In a DC motor, back EMF is proportional to:




15. The field winding of a DC shunt motor has:




16. The loss due to brushes is called:




17. Commutation in DC machines can be improved by:




18. The function of field poles in a DC machine is to:




19. The speed control of DC shunt motor is usually done by:




20. Which part of a DC machine is laminated to reduce eddy current losses?




21. If the direction of current and magnetic field are reversed, the direction of force will:




22. In DC motor, if back EMF equals supply voltage, then current is:




23. The main disadvantage of lead-acid battery is:




24. The electrolyte used in lead-acid battery is:




25. The positive plate of a lead-acid cell is made of:




26. The voltage of a fully charged lead-acid cell is about:




27. The capacity of a battery is expressed in:




28. The internal resistance of a cell increases with:




29. A fully discharged lead-acid battery has electrolyte of specific gravity:




30. During charging of a lead-acid battery, the positive plate becomes:




31. The process of converting electrical energy into chemical energy is called:




32. The open-circuit voltage of a lead-acid battery depends on:




33. In DC motors, excessive sparking at brushes is due to:




34. A separately excited DC generator requires:




35. The back EMF in a DC motor acts:




36. The armature winding of DC machine is:




37. The number of poles in a DC machine affects:




38. A differential compound generator gives:




39. Polarization in a battery causes:




40. The most commonly used secondary cell is:




41. The active material in a lead-acid cell is:




42. The number of brushes in a 4-pole DC machine are generally:




43. Armature reaction distorts:




44. Commutator segments are insulated by:




45. The torque of a DC motor is given by:




46. The direction of rotation of a DC motor can be reversed by:




47. The brushes are placed along:




48. The main disadvantage of a series motor is:




49. The specific gravity of electrolyte in a fully charged lead-acid battery is about:




50. The instrument used to measure specific gravity of battery electrolyte is:




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