electrical engineering MCQs – Page 258

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 Review each marked answer and report any item that may be outdated or unclear.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

5141. In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?
0

A. None of the above

B. Amplitude

C. Frequency

D. Phase

5142. Over modulation results in ______________?
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A. None of the above

B. Weakening of the signal

C. Distortion

D. Excessive carrier power

5143. At 100% modulation, the power in each sideband is _____________ of that of carrier?
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A. 50%

B. 40%

C. 60%

D. 25%

5144. In amplitude modulation, bandwidth is ____________ the audio signal frequency?
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A. Four times

B. Thrice

C. Twice

D. None of the above

5145. If modulation is 100% then signal amplitude is ____________arrier amplitude?
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A. None of the above

B. Greater than

C. Less than

D. Equal to

5146. In pakistan, ______________ modulation is used for radio transmission?
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A. Phase

B. Amplitude

C. Frequency

D. None of the above

5147. Modulation is done in____________________
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A. Radio receiver

B. Transmitter

C. None of the above

D. Between transmitter and radio receiver

5148. Overmodulation (amplitude) occurs when signal amplitude is _____________ carrier amplitude?
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A. Equal to

B. Greater than

C. None of the above

D. Less than

5149. In a D.C. generator the critical resistance can be increased by_____________?
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A. decreasing its speed

B. increasing its field resistance

C. increasing its speed

D. decreasing its field resistance

5150. The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?
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A. may be greater or less than 250 V

B. will be less than 250 V

C. will always be 250 V

D. none of the above

5151. The series field of a short-shunt D.C. generator is excited by_______________?
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A. armature current

B. shunt current

C. external current

D. load current

5152. Which generator would you prefer for feeding long D.C. transmission lines ?
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A. Flat compound generator

B. Over compound generator

C. Shunt generator

D. Series generator

5153. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?
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A. Blv

B. Blv2

C. Bl2v2

D. Bl2v

5154. The purpose of providing dummy coils in a generator is__________________?
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A. to reduce eddy current losses

B. to provide mechanical balance for the rotor

C. to amplify voltage

D. to enhance flux density

5155. For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?
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A. polarity of incoming generator should be same as that of bus bar

B. series fields of all generators should be either on positive side or negative side of the armature

C. all the series fields should be run in parallel by means of equilizer connection

D. all conditions mentioned above should be satisfied

E. voltage of the incoming generator should be same as that of bus bar

5156. Magnetic field in a D.C. generator is produced by_______________?
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A. electromagnets

B. permanent magnets

C. both A. and B.

D. none of the above

5157. D.C. generator generally preferred for charging automobile batteries is______________?
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A. any ofthe above

B. series generator

C. shunt generator

D. long shunt compound generator

5158. Satisfactory commutation of D.C. machines requires______________?
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A. brushes should be of proper grade and size

B. smooth, concentric commutator properly undercut

C. brushes should smoothly run in the holders

D. all of the above

5159. Wave winding is composed of_______________?
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A. that even number which is exact multiple of poles

B. any odd number of conductors

C. any even number of conductors

D. that even number which is exact multiple of poles + 2

5160. The field coils of D.C. generator are usually made of_____________?
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A. mica

B. carbon

C. copper

D. cast iron

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