electrical engineering MCQs – Page 326

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 Review each marked answer and report any item that may be outdated or unclear.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
6501. The superconductivity is due to____________?
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A. the crystal structure having no atomic vibration at 0K

B. the electrons jump into nucleus at 0K

C. none of the above

D. all electrons interact in the super-conducting state

6502. Total number of crystal systems is____________?
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A. 2

B. 12

C. 4

D. 7
6503. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
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A. increases

B. does not change

C. decreases

6504. In graphite, bonding is____________?
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A. Vander Waals

B. metallic

C. Vander Waals and covalent

D. covalent

6505. Which of the following materials is preferred for transmitting electrical energy over long distance ?
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A. Aluminium

B. Steel reinforced aluminium

C. Copper

D. Steel reinforced copper

6506. High resistivity materials are used in_____________?
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A. all of the above

B. heating elements

C. incandescent lamps

D. precision instruments

E. motor starters

6507. Commonly used conducting materials are_____________?
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A. copper

B. aluminium

C. both (A) and (B)

D. copper and silver

E. platinum and gold

6508. Spark plug makes use of which of the following materials for insulation ?
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A. Glass

B. Asbestos

C. Porcelain

D. Slate

6509. The co-ordination number of a simple cubic structure is______________?
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A. 2

B. 6

C. 4

D. 8

6510. Mercury as an electric contact material is_______________?
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A. a liquid

B. a metal

C. a metal liquid

D. a gas

6511. Solder is an alloy of______________?
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A. nickel, copper and zinc

B. silver, copper and lead

C. copper and aluminium

D. tin and lead
6512. highest conductivity_____________?
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A. all of the above

B. easy solderable and drawable quality

C. lowest temperature co-efficient

D. good corrosion resistance

E. good mechanical strength

6513. The conduction of electricity, in semiconductors, takes place due to movement of______________?
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A. negative ions only

B. positive and negative ions

C. electrons and holes

D. positive ions only

6514. Selenium is __________ semiconductor?
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A. P-type

B. N-type

C. extrnisic

D. intmisic
6515. On which of the following factors does the resistivity of a material depend ?
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A. Length of the conductor

B. Resistance of the conductor

C. All of the above

D. Area of the conductor section

6516. Which of the following material is not a semiconductor ?
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A. Gallium-arsenide

B. Selenium

C. Germanium

D. Silica
6517. Surface resistance of an insulating material is reduced due to the______________?
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A. smoky and dirty atmosphere

B. humidity in the atmosphere

C. both (A) and (b)

D. neither (A) nor (b)

6518. ___________ has the best damping properties?
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A. Diamond

B. High speed steel

C. Mild steel

D. Cast iron
6519. Thermocouples are mainly used for the measurement of_____________?
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A. eddy currents

B. resistance

C. coupling co-efficient

D. temperature
6520. Steel wire is used as____________?
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A. core wire of ACSR

B. earth wire

C. overhead telephone wire

D. all of the above