electrical engineering MCQs – Page 247

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 Review each marked answer and report any item that may be outdated or unclear.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 generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
4921. Which of the following is not a unit of flux?
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A. Telsa

B. All of the above

C. Maxwell

D. Weber

4922. The initial permeability of an iron rod is________________?
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A. the permeability at the end of the iron rod

B. the lowest permeability of the iron rod

C. the permeability almost in non-magnetised state

D. the highest permeability of the iron rod

4923. One telsa is equal to___________?
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A. 1 Wb/m2

B. 1 Wb/mm2

C. 1 Wb/m

D. 1 mWb/m2

4924. Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________?
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A. 2 x KT3 N/m

B. 2 x 1(T2 N/m)

C. 2x 1(T7 N/m)

D. 2 x 10?5 N/m

4925. he retentivity (a property) of material is useful for the construction of__________?
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A. electromagnets

B. transformers

C. non-magnetic substances

D. permanent magnets
4926. For which of the following materials the saturation value is the highest ?
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A. Ferromagnetic materials

B. Paramagnetic materials

C. Ferrites

D. Diamagnetic materials

4927. The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is________________?
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A. proportional to 7

B. proportional to distance between the conductors

C. inversely proportional to I

D. proportional to X
4928. Gilbert is a unit of_______________?
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A. electromotive force

B. permittivity

C. conductance

D. magnetomotive force
4929. Which of the following type of materials are not very important for engineering applications ?
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A. None of the above

B. Diamagnetic

C. Ferromagnetic

D. Paramagnetic

4930. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?
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A. M/4

B. M/2

C. 2 M

D. M

4931. Out of the following statements, concerning an electric field, which statement is not true ?
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A. The electric intensity is a vector quantity

B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point

C. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

D. An electric field is defined as a point in space at which an electric charge would experience a force

4932. Substances which have permeability less than the permeability of free space are known as_____________?
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A. paramagnetic

B. ferromagnetic

C. bipolar

D. diamagnetic
4933. Temporary magnets are used in______________?
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A. loud-speakers

B. all of the above

C. motors

D. generators

4934. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?
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A. 1 N

B. 10 N

C. 0.1 N

D. 100 N

4935. Air gap has_________eluctance as compared to iron or steel path?
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A. little

B. lower

C. zero

D. higher

4936. If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?
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A. equal to that of disc and in the same direction

B. less than that of disc and in the same direction

C. equal to that of disc and in the opposite direction

D. less than that of disc but in opposite direction

4937. The Biot-savarts law is a general modification of_______________?
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A. Faradays laws

B. Kirchhoffs law

C. Amperes law

D. Lenzs law

4938. A keeper is used to_____________?
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A. provide a closed path for flux

B. restore lost flux

C. amplify flux

D. change the direction of magnetic lines

4939. Core of an electromagnet should have____________?
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A. low coercivity

B. high susceptibility

C. both of the above

D. none of the above

4940. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
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A. 22 x 10-6 N

B. 22 x 10?5 N

C. 22 x 10?8 N

D. 22 x 10?7 N