analog electronics MCQs – Page 2

Practise focused analog electronics questions with marked answers for exam preparation and subject revision.

analog electronics Mcqs
21. 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

22. 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
23. 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

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

B. battery

C. inductor

D. resistor

25. . 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
26. 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
27. 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
28. 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

29. 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
30. 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

31. 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
32. 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

33. 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

34. 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

35. 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

36. 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

37. 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

38. 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
39. 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

40. 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