electrical engineering MCQs – Page 94

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 Review each marked answer and report any item that may be outdated or unclear.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
1861. Laminated cores, in electrical machines, are used to reduce____________?
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A. hysteresis loss

B. eddy current loss

C. all of the above

D. copper loss

1862. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?
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A. 50V

B. 25V

C. 15 V

D. 10 V

1863. A ferrite core has less eddy current loss than an iron core because_______________?
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A. ferrites have low permeability

B. ferrites are magnetic

C. ferrites have high hysteresis

D. ferrites have high resistance
1864. Which of the following is incorrect ?
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A. A storage cell has a reversible chemical reaction

B. A primary cell has an irreversible chemical reaction

C. A carbon-zinc cell has unlimited shelf life

D. A lead-acid cell can be recharged

1865. Which circuit element(s) will oppose the change in circuit current ?
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A. Resistance only

B. Inductance and capacitance

C. Capacitance only

D. Inductance only
1866. The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be______________?
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A. 1200 N/C

B. 400 N/C

C. 800 N/C

D. 600 N/C

1867. One volt is the same as___________?
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A. one joule/coulomb

B. one coulomb

C. one joule

D. one coulomb/joule

1868. An open coil has_____________?
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A. infinite resistance and zero inductance

B. infinite resistance and normal inductance

C. zero resistance and inductance

D. zero resistance and high inductance

1869. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?
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A. 16 A/s

B. 4 A/s

C. 64 A/s

D. 32 A/s

1870. capacitors are mainly used for radio frequency tuning?
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A. Mica

B. Air

C. Electrolytic

D. Paper

1871. An electrolytic capacitor can be used for_____________?
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A. D.C. only

B. AC. only

C. both D.C. as well as A.C.

1872. The unit of retentivity is____________?
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A. ampere turn/meter

B. ampere turn

C. weber/sq. m

D. weber

1873. Two 300 uH coils in series without mutual coupling have a total inductance of___________?
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A. 300 uH

B. 75 uH

C. 150 uH

D. 600 uH

1874. An air gap is usually inserted in magnetic circuits to____________?
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A. prevent saturation

B. increase m.m.f.

C. increase the flux

D. none of the above

1875. The lines of force due to charged particles are_________?
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A. none of the above

B. sometimes curved

C. always straight

D. always curved
1876. Dielectric strength of medium____________?
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A. is same for all insulating materials

B. increases with moisture content

C. none of the above

D. increases with rise in temperature

1877. Which of the following expression is correct for electric field strength___________?
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A. E= nD2

B. E = D2/t

C. E = D/E

D. E = jtD

1878. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________?
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A. 1.5 x 1015 m/s2

B. 1.6 x 1015 m/s2

C. 1.76 x 1015 m/s2

D. 0.56 x 1015 m/s2

1879. If three 10 uF capacitors are connected in parallel, the net cararitance is___________?
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A. 20 uF

B. 50 uF

C. 30 uE

D. 40 uF

1880. The unit of capacitance is__________?
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A. farad/m

B. ohm

C. farad

D. henry