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

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




2. In a DC shunt motor, the field winding is:




3. Which type of DC motor is generally used in cranes and hoists due to high starting torque?




4. A battery’s capacity is usually rated in:




5. The back EMF in a DC motor:




6. The main loss in a DC machine due to magnetic hysteresis is called:




7. In a DC series motor, if the load is removed, the speed:




8. Which of the following DC machines can operate as both motor and generator?




9. The armature reaction in a DC machine causes:




10. Overcharging of a lead-acid battery may cause:




11. In a battery, sulfation occurs when:




12. The torque of a DC motor is proportional to:




13. In a separately excited DC motor, the field is supplied from:




14. The series field winding in a compound DC motor:




15. Armature reaction is most pronounced in:




16. Commutation in a DC motor refers to:




17. The no-load speed of a DC shunt motor:




18. The EMF equation of a DC generator is:




19. Which type of battery is widely used in UPS systems?




20. A DC shunt generator’s terminal voltage:




21. The efficiency of a DC motor is maximum at:




22. The main advantage of a DC shunt motor is:




23. In a lead-acid battery, during charging, the process that occurs at the positive plate is:




24. A DC compound motor is preferred when:




25. Which battery type has the highest energy density?




26. DC series motors are unsuitable for:




27. Which type of DC motor has both series and shunt field windings?




28. The purpose of a starter in a DC motor is to:




29. The main disadvantage of a DC series motor is:




30. Which of the following affects the EMF of a DC generator?




31. In a battery, electrolyte functions as:




32. A battery’s life can be extended by:




33. The most common material for DC motor brushes is:




34. Increasing the armature voltage of a DC motor:




35. Interpoles in a DC machine are used to:




36. Compensating windings in a DC machine are used to:




37. DC shunt motors are suitable for:




38. The series field winding in a DC motor:




39. Overheating of a DC motor may be caused by:




40. Lead-acid batteries are:




41. The starting torque of a DC series motor is:




42. Which DC motor type maintains nearly constant speed?




43. The EMF induced in a DC generator depends on:




44. In a lead-acid battery, the electrolyte is:




45. Which of the following is true for DC series motors?




46. DC compound motors are used where:




47. In a DC shunt generator, the terminal voltage:




48. The efficiency of a battery depends on:




49. A rechargeable battery can be used multiple times because:




50. Which of the following increases the EMF of a DC generator?




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