electrical engineering MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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
341. In square wave operation mode of 3 phase VSI, the VSI
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A. Cannot control the load voltage

B. Cannot control the load voltage except by means of dc link voltage

C. Can control the load voltage

D. Cannot control the load voltage except by means of dc link current

342. Harmonics in 3 phase inverters can be reduced by using___________?
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A. Passive filter

B. Active filter

C. Both passive and active filters

D. None of these

343. A transformer oil must be free from________________?
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A. moisture

B. gases

C. sludge

D. odour

344. In a lamp load when more than one lamp are switched on the total resistance of the load_____________?
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A. remains same

B. increases

C. none of the above

D. decreases
345. The size of poxvirus is_______________?
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A. 20 nm

B. 200 nm

C. 250 nm

D. 300 nm
346. A crowbar is a circuit which is used to protect a_____________?
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A. voltage sensitive load from excessive ac power supply output voltages

B. voltage sensitive load from excessive dc power supply output voltages

C. current sensitive load from excessive dc power supply output voltages

D. current sensitive load from excessive ac power supply output voltages

347. Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of_______________?
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A. AC input power to the transformer volt amp rating required by primary

B. AC input power to the transformer volt amp rating required by secondary

C. DC output power to the transformer volt amp rating required by secondary

D. DC output power to the transformer volt amp rating required by primary

348. Which of the following is not a part of transformer installation ?
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A. Buchholz relay

B. Exciter

C. Conservator

D. Breather

349. Ohms law is not applicable to__________?
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A. D. C. circuits

B. small resistors

C. semi-conductors

D. high currents

350. When a given transformer is run at its rated voltage but reduced frequency, its____________?
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A. iron losses are reduced

B. core flux density is reduced

C. flux density remains unaffected

D. core flux density is increased
351. Which of the following is the most likely source of harmonics in a transformer ?
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A. Overload

B. Core saturation

C. poor insulation

D. loose connections

352. Electric current passing through the circuit produces_____________?
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A. magnetic effect

B. luminous effect

C. chemical effect

D. thermal effect

E. all above effects
353. A glass rod when rubbed with silk cloth is charged because__________?
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A. it gives away positive charge

B. its atoms are removed

C. it takes in proton

D. it gives away electrons
354. Helical coils can be used on___________________?
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A. high voltage side of high kVA rating transformers

B. high frequency transformers

C. high voltage side of small capacity transformers

D. low voltage side of high kVA transformers
355. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is___________?
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A. 1 milli-mho

B. none of the above

C. 1 n-mho

D. 106 mho

356. Helical coils can be used on___________?
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A. high voltage side of high kVA rating transformers

B. high voltage side of small capacity transformers

C. low voltage side of high kVA transformers

D. high frequency transformers

357. Power transformers are generally designed to have maximum efficiency around__________?
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A. half-load

B. near full-load

C. 10% overload

D. no-load

358. Which is the best conductor of electricity _______________?
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A. Copper

B. Iron

C. Silver

D. Carbon

359. Natural oil cooling is used for transformers up to a rating of____________?
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A. 1000 kVA

B. 3000 kVA

C. 250 kVA

D. 500 kVA

360. The path of the magnetic flux in transformer should have____________?
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A. high resistance

B. low reactance

C. low resistance

D. high reluctance