electrical engineering MCQs – Page 132

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 Review each marked answer and report any item that may be outdated or unclear.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
2621. Superconducting metal in super conducting state has relative permeability of________________?
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A. one

B. zero

C. more than one

D. negative

2622. The carbon percentage is least in__________________?
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A. low carbon steel

B. cast iron

C. wrought iron

D. malleable iron

2623. is an element used in semiconductors whose atoms have three valence electrons?
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A. Germanium

B. A donor

C. An acceptor

D. Silicon

2624. In pakistan, ______________ modulation is used for radio transmission?
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A. Amplitude

B. Phase

C. None of the above

D. Frequency

2625. The conductivity of a conductor can be increased by_______________?
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A. decreasing its vibration

B. increasing its temperature

C. increasing its vibration

D. decreasing its temperature
2626. On which of the following factors does the resistivity of a material depend ?
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A. All of the above

B. Length of the conductor

C. Resistance of the conductor

D. Area of the conductor section

2627. In the above question, what is the power in sidebands ?
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A. 06 kW

B. 6 kW

C. 8 kW

D. 9 kW

2628. The kinetic energy of a bounded electron is______________?
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A. greater than that of unbounded electron

B. none of the above

C. infinite

D. less than that of unbounded electron

E. equal to that of unbounded electron

2629. In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?
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A. any of the above.

B. small

C. large

D. medium

2630. High resistivity materials are used in_____________?
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A. precision instruments

B. incandescent lamps

C. motor starters

D. all of the above

E. heating elements

2631. A class C amplifier always drives _____________load?
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A. A pure capacitive

B. A pure inductive

C. A pure resistive

D. A resonant tank
2632. Which of the following are non-conductors of electricity?
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A. Air and most other gases

B. Non-metal solids except carbon

C. All of the above

D. Pure water and liquids in general except mercury

2633. In an AM wave, the majority of the power is in _____________?
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A. Lower sideband

B. Upper sideband

C. None of the above

D. Carrier
2634. 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

2635. Which of the following affect greatly the resistivity of electrical conductors ?
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A. Pressure

B. Temperature

C. Composition

D. Size

2636. Carbon electrodes are not used in_______________?
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A. GLS lamps

B. dry cells

C. cinema projectors

D. electric arc furnace

2637. Most of the amplification in a superhetrodyne receiver occurs at ______________stage?
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A. Audio amplifier

B. Detector

C. IF

D. RF amplifier

2638. Negative feedback in an amplifier____________?
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A. Reduces bandwidth

B. Increases noise

C. Increase frequency &phase distortion

D. Reduces gain
2639. By increasing impurity content in the metal alloy the residual resistivity always_____________?
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A. increases

B. decreases

C. becomes temperature independent

D. remains constant

2640. Which of the following is the poorest conductor of electricity ?
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A. Aluminium

B. Carbon

C. Steel

D. Silver