electrical engineering MCQs – Page 284

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

5661. In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
0

A. as separately wound unit

B. in parallel with armature winding

C. in parallel with field winding

D. in series with armature winding

5662. In D.C. machines fractional pitch winding is used__________?
0

A. to reduce the sparking

B. to increase the generated e.m.f.

C. to reduce copper losses

D. to improve cooling

5663. The condition for maximum power in case of D.C. motor is______________?
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A. supply voltage = back e.m.f

B. back e.m.f. = 2 x supply voltage

C. back e.m.f. = | x supply voltage

D. supply voltage = | x back e.m.f

5664. Which of the following motor has the poorest speed regulation ?
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A. Shunt motor

B. Differential compound motor

C. Cumulative compound motor

D. Series motor

5665. During rheostat braking of D.C. series motors_____________?
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A. motor is run at reduced speed

B. motor is reversed in direction

C. motor is run as a generator

5666. If the supply voltage for a D.C. motor is increased, which of the following will decrease ?
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A. Starting torque

B. Full-load current

C. Operating speed

D. All of the above

5667. D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
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A. shunt motor

B. compound motor

C. any of the above

D. series motor

5668. Which of the following losses are significantly reduced by laminating the core of a D.C. generator ?
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A. Eddy current losses

B. Copper losses

C. Windage losses

D. Hysteresis losses

5669. Which of the following loss in a D.C. generator varies significantly with the load current ?
0

A. Windage loss

B. None of the above

C. Armature copper loss

D. Field copper loss

5670. Which of the following method is used for the speed control of DC shunt motor?
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A. all of the above

B. rheostat control method

C. flux control method

D. voltage control method

5671. The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
0

A. armature copper loss

B. field copper loss

C. hysteresis loss

D. eddy current loss

5672. In a differentially compounded D.C. motor, if shunt field suddenly opens____________?
0

A. the motor will work as series motor and run at slow speed in the same direction

B. the motor will not work and come to stop

C. the motor will work as series motor and run at high speed in the same direction

D. the motor will first stop and then run in opposite direction as series motor

5673. In which of the following device the generated emf and armature current are in the opposite directions?
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A. dc generator

B. all of the above

C. dc motor

D. transformer

5674. If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking?
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A. any of the above

B. plugging

C. dynamic braking

D. none of the above

E. regenerative

5675. Following motor is used where high starting torque and wide speed range control is required?
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A. None of the above

B. Induction motor

C. Synchronous motor

D. Single phase capacitor start

E. D.C. motor

5676. Why are the D.C. motors preferred for traction applications ?
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A. The speed is inversely proportional to the torque and the torque is proportional to square of armature current

B. Torque is proportional to armature current

C. Torque and speed are inversely proportional to armature current

D. Torque is proportional to square root of armature current

5677. The armature voltage control of D.C. motor provides_____________?
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A. constant torque drive

B. constant voltage drive

C. none of the above

D. constant current drive

5678. What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
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A. The armature may burn

B. The motor will stop

C. The motor will run noisy

D. The motor will continue to run

5679. D.C. generators are installed near the load centres to reduce_____________?
0

A. sparking

B. corona losses

C. line losses

D. iron losses

5680. The speed of a D.C. shunt motor can be increased by_______________?
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A. reducing the resistance in the armature circuit

B. reducing the resistance in the field circuit

C. increasing the resistance in field circuit

D. increasing the resistance in armature circuit

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