Analog Electronics Mcqs
This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Analog Electronics ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Analog Electronics comprehensively.
32. The most commonly used amplifier in sample & hold circuits is______________?
A unity gain non-inverting amplifier
A unity gain inverting amplifier
An inverting amplifier with a gain of 10
An inverting amplifiers with a gain of 100
Answer & Solution
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33. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in____________?
Only the temperature
Only the β of the transistor
Both Temperature & β
None of the above
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34. In a CB amplifier the maximum efficiency could be____________?
99%
85%
50%
25%
35. The horizontal intercept of dc load line is the same as ideal____________?
Cut off point
Saturation point
Operating point
Quasi saturation point
Answer & Solution
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36. Which of the following amplifier circuit using junction transistor has the best gain?
Common base
Common emitter
Common collector
All have the same gain
Answer & Solution
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37. MOSFET can be used as a__________?
Current controlled capacitor
Voltage controlled capacitor
Current controlled inductor
Voltage controlled inductors
Answer & Solution
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38. A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
2
1
1/2
39. In a common emitter, unbypassed resister provides___________?
Voltage shunt feedback
Current series feedback
Negative voltage feedback
Positive current feedback
Answer & Solution
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40. . If =0.98 ,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be______?
2.3mA
3.2mA
4.6 mA
5.2mA
41. The MOSFET switch in its on-state may be considered equivalent to_____________?
Resistor
Inductor
Capacitor
Battery
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42. An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are________?
FT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz.
FT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz
FT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
FT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
Answer & Solution
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43. An amplifier using an opamp with slew rate SR=1v/µsec 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________?
795mV
395mV
795 mV
39.5mV
44. Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250 ,are cascaded.The open circuit voltage gain of combined amplifier is_________?
49dB
51dB
98dB
102dB
45. The cascade amplifier is a multistage configuration of__________?
CC-CB .
CE-CB
CB-CC
CE-CC