electrical engineering MCQs – Page 128

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 Review each marked answer and report any item that may be outdated or unclear.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
2541. In a crystal, an atom vibrates at a frequency determined by_______________?
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A. the heat content of the crystal

B. the temperature of the crystal

C. the stiffness of the bonds it makes with neighbors
2542. An npn BJT has gm=38mA/v, c =1014 F, c? =1013F and DC current gain ?0=90.For this transistor fT & f? are________?
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A. fT =1.47 x 1010 Hz & f? = 1.33 x 1012 Hz

B. fT =1.47 x 1010 Hz & f? = 1.64 x 108 Hz

C. fT =1.33 x 1012 Hz & f? = 1.47 x 1010 Hz

D. fT =1.64 x 108 Hz & f? = 1.47 x 1010 Hz.

2543. The co-ordination number of a simple cubic structure is______________?
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A. 8

B. 6

C. 2

D. 4

2544. When a transistor is connected in common emitter mode, it with have__________?
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A. low input resistance as well as output resistance

B. medium input resistance and high output resistance

C. high input resistance and low output resistance

D. negligible input resistance and high output resistance

2545. The action of JFET in its equivalent circuit can best be represented as a_____________?
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A. Voltage controlled voltage source

B. Current controlled Current source

C. Current controlled voltage source

D. voltage controlled current source
2546. An SCR is made of silicon and not germanium because silicon _________________?
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A. Has small leakage current

B. Is tetravalent

C. Is mechanically strong

D. Is inexpensive

2547. An H.R.C. fuse is_______________?
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A. a ceramic body having metal and caps

B. a wire of platinum

C. a heavy cross-section of copper or aluminium

D. a ceramic tube having carbon rod inside it

2548. The signal voltage induced in the aerial of a radio receiver is of the order of ________________?
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A. mV

B. None of the above

C. V

D. V

2549. Which of the following materials is used for making coils of standard resistances ?
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A. Manganin

B. Copper

C. Platinum

D. Nichrome

2550. When an SCR is turned on, the voltage across it is about _____________?
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A. 10 V

B. 1 V

C. 1 V

D. Zero

2551. When either L or C is increased, the resonant frequency of LC circuit ____________?
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A. Decreases

B. Insufficient data

C. Remains the same

D. Increases

2552. In a radio receiver, noise is generally developed at _______________?
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A. Audio stage

B. RF stage

C. IF stage

D. Receiving antenna

2553. _________ is an example of piezoelectric material?
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A. Corrundum

B. Neoprene

C. Quartz

D. Glass

2554. In all base driver amplifiers__________?
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A. ac collector voltage is 180 out of phase with ac base voltage

B. none of the above

C. ac emitter voltage is 180 out of phase with ac base voltage

D. ac collector voltage is in phase with ac base voltage

2555. As the modulation level is increased, the carrier power__________________?
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A. Remains the same

B. Is decreased

C. None of the above

D. Is increased

2556. The encapsulation of transistor is necessary for__________?
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A. preventing radio interference

B. avoiding loss of free electrons

C. mechanical ruggedness

D. preventing photo-emission effects

2557. At series resonance, the circuit offers____________ impedance?
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A. None of the above

B. Maximum

C. Minimum

D. Zero

2558. The control element of an SCR is ______________?
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A. Anode supply

B. Cathode

C. Gate

D. Anode

2559. In a TRF radio receiver, the RF and detection stages are tuned to______________?
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A. IF

B. Audio frequency

C. Radio frequency

D. None of the above

2560. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?
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A. Only the temperature

B. only the ? of the transistor

C. Both Temperature & ?

D. None of the above