electrical engineering MCQs – Page 124

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 Review each marked answer and report any item that may be outdated or unclear.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
2461. The MOSFET switch in its on-state may be considered equivalent to_____________?
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A. resistor

B. inductor

C. battery

D. capacitor
2462. The current due to electron flow in conduction band is the hole current in valence band?
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A. any of the above

B. greater than

C. less than

D. equal to

2463. A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
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A. 1

B. 2

C. 0

D. 2-Jan

2464. Which of the following is the major consideration to evolve a good design ?
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A. Durability

B. Compliance with performance criteria as laid down in specifications

C. All of the above

D. Cost

2465. _____________is viscoelastic?
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A. Rubber

B. Glass

C. Cast-iron

D. Graphite

2466. An SCR is a solid state equivalent of ______________?
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A. Gas-filled triode

B. Triode

C. Tetrode

D. Pentode

2467. For germanium the forbidden energy gap is_______________?
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A. 0.15 eV

B. 0.25 eV

C. 0.7eV

D. 0.5eV

2468. At series resonance, voltage across L is____________voltage across C?
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A. Less than but in phase with

B. Greater than but in phase with

C. Equal to but opposite in phase to

D. Equal to but in phase with

2469. The minority carrier concentration is largely a function of_____________?
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A. the amount of doping

B. temperature

C. reverse biasing voltage

D. forward biasing voltage

2470. The formula __________ determines the number of electrons that can be accommodated in any level?
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A. 4ns

B. 2n2

C. 4n2

D. 2n3

2471. If a high degree of selectivity is desired, then double-tuned circuit should have ___________ coupling?
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A. Critical

B. None of the above

C. Loose

D. Tight

2472. An SCR is made of_______________?
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A. Silicon

B. Carbon

C. None of the above

D. Germanium

2473. An SCR has three terminals viz ________________?
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A. Cathode, anode, gate

B. Anode, cathode, drain

C. Anode, cathode, grid

D. None of the above

2474. Piezoelectric materials serve as a source of ____________ ?
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A. musical waves

B. ultrasonic waves

C. resonant waves

D. microwaves

2475. An SCR combines the features of ____________?
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A. A rectifier and capacitor

B. A rectifier and transistor

C. None of the above

D. A rectifier and resistance

2476. In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ___________________?
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A. Is lowered

B. Remains the same

C. None of the above

D. Is raised
2477. Which of the following materials does not have covalent bonds ?
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A. Metals

B. Organic polymers

C. Silicon

2478. Thermonic emission occurs in______________?
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A. ferrite cores

B. vacuum tubes

C. transistors

D. copper conductors

2479. The value of critical field below the transition temperature will_______________?
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A. remain unchanged

B. decrease

C. increase

D. any of the above

2480. In radio transmission, the medium of transmission is ________________?
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A. An antenna

B. Cable

C. None of the above

D. Space