electrical engineering MCQs – Page 367

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 Review each marked answer and report any item that may be outdated or unclear.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
7321. The skin effect of a conductor will reduce as the__________?
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A. permeability of conductor material increases

B. diameter increases

C. resistivity of conductor material increases

D. frequency increases

7322. For aluminium, as compared to copper, all the following factors have higher values except:
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A. electrical conductivity

B. specific volume

C. resistance per unit length for same cross-section

D. co-efficient of linear expansion

7323. By which of the following methods string efficiency can be improved?
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A. None of the above

B. Using a guard ring

C. Using long cross arm

D. Grading the insulator

E. Any of the above
7324. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ?
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A. Circulating current method

B. Thevenins theorem

C. All of the above

D. Superposition of currents

E. Direct application of Kirehhoffs laws

7325. Pin type insulators are generally not used for voltages beyond_________?
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A. 22 kV

B. 33 kV

C. 1 kV

D. 11 kV

7326. The loads on distributors systems are generally__________________?
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A. none of the above

B. either of the above

C. unbalanced

D. balanced

7327. The operating voltage of high voltage cables is up to_______________?
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A. llkV

B. 6.6kV

C. 3.3kV

D. l.lkV

7328. In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?
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A. no insulation is required

B. varnish

C. bitumen

D. insulin

7329. The frequency of voltage generated, in case of generators, can be increased by___________?
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A. using reactors

B. none of the above

C. reducing the terminal voltage

D. adjusting the governor

E. increasing the load

7330. The voltage drop, for constant voltage transmission is compensated by installing__________?
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A. capacitors

B. synchronous motors

C. all of above

D. inductors

E. none of the above

7331. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
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A. None of the above

B. Supply voltage will increase

C. No current will flow in the conductor

D. Current will flow to earth

E. Supply voltage will drop

7332. High voltage transmission lines use__________________?
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A. suspension insulators

B. pin insulators

C. both A. and B.

D. none of the above

7333. On which of the following factors skin effect depends?
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A. Resistivity of the conductor material

B. All of the above

C. Size of the conductor

D. Frequency of the current

7334. The steel used in steel cored conductors is usually__________?
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A. mild steel

B. alloy steel

C. stainless steel

D. all of the above

E. high speed steel

7335. The operating voltage of extra high tension cables is upto_______________?
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A. 33 kV

B. 66 kV

C. 6.6 kV

D. 11 kV

E. 132 kV

7336. The spacing between phase conductors of a 220 kV line is approximately equal to________________?
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A. 8.5 m

B. 2 m

C. 6 m

D. 3.5 m

7337. A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________?
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A. one-third

B. one-half

C. none of the above

D. twice

E. one-fourth
7338. The distributors for residential areas are______________?
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A. three-phase three wire

B. single phase

C. three-phase four wire

D. none of the above

7339. For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?
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A. 132 kV

B. 11 kV

C. 33 kV

D. 66 kV

7340. When a conductor carries more current on the surface as compared to core, it is due to___________?
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A. corona

B. permeability variation

C. skin effect

D. none of the above

E. unsymmetrical fault