electrical engineering MCQs – Page 265

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

5281. In an intrinsic semiconductor, the number of free electrons_____________?
0

A. None of the above

B. Is greater than the number of holes

C. Is less than the number of holes

D. Equals the number of holes

5282. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on_________________?
0

A. Junction capacitance

B. Minority carriers

C. Majority carriers

D. None of the above

5283. At absolute temperature, an intrinsic semiconductor has________________?
0

A. Many free electrons

B. A few free electrons

C. No holes or free electrons

D. Many holes

5284. The barrier voltage at a pn junction for germanium is about________________?
0

A. 0.3 V

B. 5 V

C. 3 V

D. Zero

5285. With forward bias to a pn junction , the width of depletion layer__________________?
0

A. Increases

B. Decreases

C. Remains the same

D. None of the above

5286. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?
0

A. Decreases

B. Remains the same

C. Increases

D. None of the above

5287. In a semiconductor, current conduction is due to________________?
0

A. None of the above

B. Holes and free electrons

C. Only holes

D. Only free electrons

5288. A semiconductor is formed by ______________bonds?
0

A. None of the above

B. Co-ordinate

C. Electrovalent

D. Covalent

5289. The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?
0

A. 1 atom for 100 atoms

B. 1 atom for 108 atoms

C. 1 atom for 104 atoms

D. 10 atoms for 108 atoms

5290. Addition of trivalent impurity to a semiconductor creates many_______________?
0

A. Free electrons

B. Bound electrons

C. Valence electrons

D. Holes

5291. The battery connections required to forward bias a pn junction are_________________?
0

A. None of the above

B. +ve terminal to p and ve terminal to n

C. #NAME?

D. #NAME?

5292. At room temperature, an intrinsic semiconductor has_______________?
0

A. A few free electrons and holes

B. No holes or free electrons

C. Many free electrons only

D. Many holes only

5293. A pentavalent impurity has______________Valence electrons?
0

A. 4

B. 3

C. 6

D. 5

5294. A forward biased pn junction diode has a resistance of the order of_____________?
0

A. O

B. kO

C. None of the above

D. MO

5295. A hole in a semiconductor is defined as_________________?
0

A. strong>. A free proton

B. The incomplete part of an electron pair bond

C. A free electron

D. A free neutron

5296. When a pure semiconductor is heated, its resistance_________________?
0

A. Remains the same

B. Goes up

C. Cant say

D. Goes down

5297. The strength of a semiconductor crystal comes from______________?
0

A. Forces between protons

B. Electron-pair bonds

C. None of the above

D. Forces between nuclei

5298. The most commonly used semiconductor is________________?
0

A. Sulphur

B. Germanium

C. Silicon

D. Carbon

5299. When a pentavalent impurity is added to a pure semiconductor, it becomes________________?
0

A. An intrinsic semiconductor

B. An insulator

C. n-type semiconductor

D. p-type semiconductor

5300. A trivalent impurity has______________valence electrons?
0

A. 5

B. 6

C. 4

D. 3

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