electrical engineering MCQs – Page 329

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 Review each marked answer and report any item that may be outdated or unclear.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
6561. The conductivity of an extrinsic semiconductor with temperature________________?
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A. increases

B. decreases

C. remains constant
6562. The structure sensitive property of a super conductor is______________?
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A. transition temperature

B. critical current density

C. none of the above

D. critical magnetic field

6563. The coils of D.C. motor starter are wound with wire of_______________?
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A. kanthal

B. copper

C. nichrome

D. manganin
6564. Which of the following factors affect resistivity of metals ?
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A. Age hardening

B. Alloying

C. All of the above

D. Temperature

E. Cold work

6565. In a superconductor the value of critical density depends upon______________?
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A. magnetic field strength

B. temperature

C. either (A) or (B)

D. both (A) and (B)
6566. An H.R.C. fuse is_______________?
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A. a wire of platinum

B. a ceramic tube having carbon rod inside it

C. a ceramic body having metal and caps

D. a heavy cross-section of copper or aluminium

6567. Due to which of the following reasons copper and aluminium are not used for heating elements ?
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A. Both have great tendency for oxidation

B. Both have low melting point

C. Very large length of wires will be required

D. All of the above
6568. The carbon percentage is least in__________________?
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A. wrought iron

B. malleable iron

C. cast iron

D. low carbon steel

6569. Superconducting metal in super conducting state has relative permeability of________________?
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A. one

B. more than one

C. negative

D. zero
6570. Which of the following materials does not have covalent bonds ?
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A. Silicon

B. Organic polymers

C. Metals
6571. Which of the following affect greatly the resistivity of electrical conductors ?
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A. Size

B. Pressure

C. Composition

D. Temperature

6572. ___________ is most commonly used for making magnetic recording tape?
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A. Ferric oxide

B. Silver nitrate

C. Silicon-iron

D. Small particles of iron

6573. Low resistivity materials are used in__________?
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A. transformer, motor and generator windings

B. transmission and distribution lines

C. house wiring

D. all above applications
6574. Superconductivity is observed for____________?
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A. none of the above

B. a.c. and high frequency

C. frequencies having no effect

D. infrared frequencies

E. d.c. and low frequency
6575. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
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A. Constantan

B. Molybdenum

C. Kanthal

D. Nichrome
6576. Effect of moisture on the insulating materials is to________________?
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A. all of the above

B. decrease dielectric constant

C. increase dielectric loss

D. decrease insulation resistance

E. decrease dielectric strength

6577. Super conductivity can be destroyed by_____________?
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A. any of the above

B. reducing temperatures

C. application of magnetic field

D. adding impurities

6578. Substances whose specific resistance abruptly decreases at very low temperature are called___________?
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A. conductors

B. semiconductors

C. insulators

D. superconductors
6579. is a negatively charged particle present in an atom______________?
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A. Electron

B. Proton

C. Neutron

D. None of the above

6580. The formula __________ determines the number of electrons that can be accommodated in any level?
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A. 4ns

B. 2n3

C. 4n2

D. 2n2