electrical engineering MCQs – Page 211

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 Review each marked answer and report any item that may be outdated or unclear.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
4201. Which of the following statements is correct ?
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A. Ceramic capacitors must be connected in correct polarity

B. Electrolytic capacitors must be connected in correct polarity

C. Air capapitors have a black band to indicate the outside foil

D. Mica capacitors are available in capacitance values of 5 to 20 uF

4202. Dielectric strength _________ with increasing thickness
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A. none of the above

B. decreases

C. remains unaltered

D. increases

4203. A gang condenser is a____________?
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A. variable capacitor

B. polarised capacitor

C. none of the above

D. ceramic capacitor

4204. If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________?
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A. 1600 uC

B. 1200 uC

C. 900 uC

D. 800 uC

4205. select the correct statement?
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A. the electric lines of force have no physical existence

B. all the above statements are true

C. they expand laterally and contract longitudinally

D. they do not cross each other and group together in dielectric

4206. capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?
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A. 9 volts

B. 4 volts

C. 2 volts

D. 1 vol

4207. The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?
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A. CIR

B. RIC

C. RC

D. 1/RC

4208. The electric charge of 100 C is 13cm apart from another charge 16.9C electric force between them is_____________?
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A. 9x106N

B. 900N

C. 9x105N

D. 9x107N

4209. In a non-uniform electric field a polar molecule will experience____________?
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A. Net torque

B. Net force

C. both series and parallel combinations

D. zero

4210. A 25eV electron has a speed of______________?
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A. 4 x 106m/sec

B. 5 x 106m/sec

C. 3 x 106m/sec

D. 2 x 106m/sec

4211. The capacitor preferred for high frequency circuits is_____________?
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A. none of the above

B. mica capacitor

C. air capacitor

D. electrolytic capacitor

4212. Dielectric strength of a medium is usually expressed in____________?
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A. N/mm

B. C/m2

C. kV/mm

D. J/mm

4213. Which of the following statements is incorrect ?
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A. A capacitor can store charge because it has a dielectric between two conductors

B. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

C. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

D. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .

4214. The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________?
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A. electrons

B. neutrons

C. protons

D. electric field
4215. Electric intensity at infinite distance from the point charge is_____________?
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A. zero

B. positive

C. negative

D. infinite

4216. The number of electrons in one coulomb charge is equal to_______________?
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A. 1.6 x 10-27

B. 1.6 x 1019

C. 6.2 x 1018

D. 6.2 x 1021

4217. Paper condenser is___________?
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A. a variable condenser

B. always polarised

C. usually of fixed value

D. electrolytic condenser

4218. Dielectric strength of medium____________?
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A. increases with rise in temperature

B. increases with moisture content

C. is same for all insulating materials

D. none of the above
4219. is that property of a capacitor which delays any change of voltage across it ?
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A. None of the above

B. Capacitance

C. Inductance

D. Potential gradient

4220. The unit of capacitance is__________?
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A. farad

B. ohm

C. farad/m

D. henry