electrical engineering MCQs – Page 192

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 Review each marked answer and report any item that may be outdated or unclear.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
3821. A change in the value of the emitter resistance Re in a differential amplifier?
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A. affects the difference mode gain Ad

B. affects the common mode gain Ac

C. ffects both Ad and Ac

D. does not effect either Ad and Ac

3822. The action of JFET in its equivalent circuit can best be represented as a_____________?
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A. voltage controlled current source

B. Current controlled voltage source

C. Current controlled Current source

D. Voltage controlled voltage source

3823. Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
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A. high input resistance

B. high voltage gain

C. high CMRR

D. input voltage dependent linear transfer characteristic

3824. The early effect in a bipolar junction transistor is caused by_______________?
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A. fast turn-off

B. large emitter-base forward bias

C. large collector-base reverse bias

D. fast turn-on

3825. The current gain of a BJT is__________?
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A. gm r?

B. gm /r?

C. gm r0

D. gm / r0

3826. A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?
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A. Open-loop gain

B. Slew rate

C. CMMR

D. Bandwidth

3827. An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/?S.
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A. 10 volts

B. 5/2 volts

C. 5/1 volts

D. 5 volts

3828. In a common emitter, unbypassed resister provides___________?
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A. voltage shunt feedback

B. current series feedback

C. positive current feedback

D. negative voltage feedback
3829. 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

3830. The MOSFET switch in its on-state may be considered equivalent to_____________?
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A. capacitor

B. battery

C. inductor

D. resistor

3831. . If =0.98 ,Ico=6A and I?=100A for a transistor,then the value of Ic will be______?
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A. 4.6 mA

B. 3.2mA

C. 2.3mA

D. 5.2mA
3832. An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?
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A. 0.25

B. 1

C. 0.75

D. 0.5
3833. Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?
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A. Coupling capacitor at the input

B. Skin effect

C. Coupling capacitor at the output

D. Internal Capacitance of the device
3834. Class AB operation is often used in power large signal amplifiers in order to_________?
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A. remove even harmonics

B. get maximum efficiency

C. overcome a crossover distortion

D. reducing collector dissipation

3835. 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 =1.64 x 108 Hz & f? = 1.47 x 1010 Hz.

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

D. fT =1.47 x 1010 Hz & f? = 1.64 x 108 Hz
3836. The bandwidth of an RF tuned amplifier is dependent on____________?
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A. Quiescent operating point

B. Q factor of the tuned i/p circuit

C. Q factor of the tuned o/p circuit

D. Q-factor of the o/p and i/p circuits as well as quiescent operating point

3837. The horizontal intercept of dc load line is the same as ideal____________?
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A. saturation point

B. quasi saturation point

C. operating point

D. cut off point
3838. MOSFET can be used as a__________?
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A. voltage controlled capacitor

B. voltage controlled inductors

C. current controlled capacitor

D. current controlled inductor

3839. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1K? & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
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A. 102dB

B. 98dB

C. 51dB

D. 49dB

3840. A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?
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A. 2v

B. 1 v

C. 2.8v

D. 1.4v