electrical engineering MCQs – Page 143

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 Review each marked answer and report any item that may be outdated or unclear.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
2841. The materil used to coat inside the face of CRT is ______________?
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A. Phosphorous

B. Carbon

C. Silicon

D. Sulphur

2842. A MOSFET differs from a JFET mainly because _________________?
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A. of power rating

B. the JFET has a pn junction

C. the MOSFET has two gates

D. none of the above

2843. A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?
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A. Equal to

B. More than

C. None of the above

D. Less than

2844. ____________are always double layer type?
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A. Open windings

B. Closed windings

C. Either of the above

D. None of the above

2845. The surge phenomenon is particularly important in case of_______________?
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A. low voltage transformers

B. high voltage transformers

C. medium voltage transformers

D. any of the above

2846. If a square wave is fed to a differentiating circuit, the output will be _____________?
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A. Triangular wave

B. Sine wave

C. Sharp narrow pulses

D. Rectangular wave

2847. Tractive magnets are operated from____________?
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A. either a.c. or d.c. supply

B. a.c. supply

C. none of the above</strong>

D. d.c. supply

2848. The mcrease in heat dissipation by air blasts is due to increase in______________?
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A. conduction

B. any ofthe above

C. convection

D. radiation

2849. For display of signal pattern _____________voltage is applied to the horizontal plates of a CRO?
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A. Rectangular

B. Sinusoidal

C. Sawtooth

D. None of the above

2850. Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?
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A. 30 V

B. 5 V

C. 45 V

D. 15 V

2851. Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?
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A. 7.5 MVA

B. 10 MVA

C. 2 MVA

D. 5 MVA

2852. Which of the following is the commonly used type of electromagnets ?
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A. Flat-faced armature type

B. All of the above

C. Horse shoe type

D. Flat-faced plunger type

2853. An ideal regulated power supply is one which has voltage regulation of________________?
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A. 10%

B. 0%

C. 5%

D. 1%

2854. The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve?
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A. diode

B. pentode

C. tetrode

D. triode

2855. We use _____________ ICs in computers?
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A. Digital

B. Linear

C. Both digital and linear

D. None of the above

2856. The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube?
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A. cathode

B. grid cut off

C. none of the above

D. anode

2857. What is true about the breakdown voltage in a Zener diode ?
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A. It destroys the diode

B. It equals current times the resistance

C. It is approximately constant

D. It decreases when load current increases

2858. D.C. machines designed with a large value of air gap length have_____________?
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A. worst, ventilation

B. none of the above

C. better ventilation

D. poor ventilation

2859. The Zener current will be minimum when_____________?
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A. None of the above

B. Load current is zero

C. Load current is minimum

D. Load current is maximum
2860. In a FET, there are _____________pn junctions at the sides?
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A. five

B. three

C. two

D. four