electrical engineering MCQs – Page 193

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 Review each marked answer and report any item that may be outdated or unclear.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
3841. The encapsulation of transistor is necessary for__________?
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A. preventing photo-emission effects

B. mechanical ruggedness

C. avoiding loss of free electrons

D. preventing radio interference

3842. A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?
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A. 50 KHz

B. 100KHz

C. 1000/7.07 KHz

D. 1000/17 KHz

3843. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db &2db respectively, then its common mode rejection ratio is__________?
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A. 46dB

B. 50dB

C. 23dB

D. 25dB

3844. In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?
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A. all transistors

B. all inductors

C. all resistors

D. all capacitors
3845. To prevent a DC return between source and load, it is necessary to use___________?
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A. capacitor between source and load

B. either A. or B.

C. resistor between source and load

D. inductor between source and load

3846. 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

3847. In a transistor leakage current mainly depends on__________?
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A. size of emitter

B. temperature

C. doping of base

D. rating of transistor

3848. Negative feedback in an amplifier____________?
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A. Increases noise

B. Reduces gain

C. Increase frequency &phase distortion

D. Reduces bandwidth

3849. When a transistor is connected in common emitter mode, it with have__________?
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A. negligible input resistance and high output resistance

B. low input resistance as well as output resistance

C. medium input resistance and high output resistance

D. high input resistance and low output resistance

3850. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed________?
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A. 795 mV

B. 795mV

C. 39.5mV

D. 395mV

3851. An ideal OP-AMP is an ideal___________?
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A. voltage controlled current source

B. Current controlled Current source

C. Current controlled voltage source

D. Voltage controlled voltage source

3852. Which of the following is not associated with a p-n junction?
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A. junction capacitance

B. depletion capacitance

C. channel length modulation

D. charge storage capacitance

3853. Thermal runaway is not possible in FET because as the temperature of FET increases_________________?
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A. the transconductance increases

B. the drain current increases

C. the mobility decreases

D. none of the above

3854. A bistable multivibrator has _________________?
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A. Two stable states

B. None of the above

C. No stable state

D. One stable state

3855. One would find a clamping circuit in ___________________?
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A. Receiving antenna

B. Television receiver

C. Radio receiver

D. Radio transmitter

3856. The multivibrator which generates square wave of its own is the ____________multivibrator?
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A. Monostable

B. None of the above

C. Astable

D. Bistable

3857. If a square wave is fed to a differentiating circuit, the output will be _____________?
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A. Sharp narrow pulses

B. Triangular wave

C. Rectangular wave

D. Sine wave

3858. The main disadvantage of a mechanical switch is that it_______________?
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A. Is operated mechanically

B. None of the above

C. Has high inertia

D. Is costly

3859. A relay is ___________switch?
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A. A mechanical

B. An electronic

C. An electromechanical

D. None of the above

3860. The most inexpensive switch is _____________ switch?
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A. Electronic

B. Electromechanical

C. None of the above

D. Mechanical