electrical engineering MCQs – Page 202

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 Review each marked answer and report any item that may be outdated or unclear.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
4021. An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is____________?
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A. 10 V

B. 5/2 V

C. 5V

D. 5 V

4022. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5k? and C1 = 0.05?F___________?
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A. 127.3 Hz

B. 1.273kHz

C. 127.3 kHz

D. 12.73kHz

4023. If ground is applied to the (+) terminal of an inverting op-amp, the () terminal will_____________?
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A. Have high reverse current

B. Not invert the signal

C. Not need an input resistor

D. Be virtual ground
4024. Hysteresis is desirable in Schmitt-trigger, because______________?
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A. Energy is to be stored/discharged in parasitic capacitances

B. It would prevent noise from causing false triggering

C. Devices in the circuit should be allowed time for saturation and desaturation

D. Effects of temperature would be compensated

4025. The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?
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A. ?

B. 120k

C. 110k

D. 10k

4026. When a step-input is given to an op-amp integrator, the output will be______________?
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A. A ramp

B. A rectangular wave

C. A triangular wave with dc bias

D. A sinusoidal wave

4027. The output voltage Vo of the above circuit is____________?
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A. -1.2V

B. -6V

C. -0.2V

D. -5V
4028. 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. CMMR

B. Open-loop gain

C. Bandwidth

D. Slew rate
4029. Differential amplifiers are used in______________?
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A. Voltage followers

B. Buffers

C. Voltage regulators

D. Instrumentation amplifiers
4030. Which of the following amplifier is used in a digital to analog converter?
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A. Difference amplifier

B. Non inverter

C. Summer

D. Voltage follower

4031. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?
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A. 2-Jan

B. 0

C. 2

D. 1

4032. 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
4033. Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
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A. Triangular wave

B. Parabolic wave

C. Square wave

D. Sine wave
4034. 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 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed_____________?
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A. 795mV

B. 795mV

C. 395mV

D. 39.5mV

4035. How many op-amps are required to implement this equationop-amps?
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A. 2

B. 1

C. 3

D. 4

4036. For an ideal op-amp, which of the following is true?
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A. The current into the input terminals is zero

B. The output resistance is zero

C. The differential voltage across the input terminals is zero

D. The current from output terminal is zero
4037. A non inverting closed loop op amp circuit generally has a gain factor______________?
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A. Greater than one

B. Less than one

C. Equal to one

D. Of zero

4038. The ideal OP-AMP has the following characteristics
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A. Ri=? ,A=? ,R0=?

B. Ri=? ,A=? ,R0=0

C. Ri=0 ,A=? ,R0=0

D. Ri=0 ,A=? ,R0=?

4039. 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. 25dB

C. 23dB

D. 50dB

4040. A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?
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A. 50KHz

B. 1000/17KHz

C. 1000/7.07KHz

D. 100KHz