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Analog Electronics

Study 46 Electrical Engineering MCQs with correct answers and explanations.

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11Electrical EngineeringMedium

The current gain of a BJT is________?

Agm rπ

Bgm r0

Correct answer

A. gm rπ

Explanation

The correct answer is gm rπ.

12Electrical EngineeringMedium

The cascade amplifier is a multistage configuration of________?

ACC-CB.

BCE-CC

CCB-CC

DCE-CB

Correct answer

D. CE-CB

Explanation

The correct answer is CE-CB.

13Electrical EngineeringMedium

In all base driver amplifiers________?

Aac collector voltage is in phase with ac base voltage

Bac emitter voltage is 180° out of phase with ac base voltage

Cac collector voltage is 180° out of phase with ac base voltage

Dnone of the above

Correct answer

C. ac collector voltage is 180° out of phase with ac base voltage

Explanation

The correct answer is ac collector voltage is 180° out of phase with ac base voltage.

14Electrical EngineeringMedium

The encapsulation of transistor is necessary for________?

Aavoiding loss of free electrons

Bpreventing photo-emission effects

Cmechanical ruggedness

Dpreventing radio interference

Correct answer

C. mechanical ruggedness

Explanation

The correct answer is mechanical ruggedness.

15Electrical EngineeringMedium

The horizontal intercept of dc load line is the same as ideal________?

Aquasi saturation point

Bcut off point

Csaturation point

Doperating point

Correct answer

B. cut off point

Explanation

The correct answer is cut off point.

16Electrical EngineeringMedium

Negative feedback in an amplifier________?

AReduces gain

BReduces bandwidth

CIncrease frequency &phase distortion

DIncreases noise

Correct answer

A. Reduces gain

Explanation

The correct answer is Reduces gain.

17Electrical EngineeringMedium

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________?

A795mV

B395mV

C39.5mV

D795 mV

Correct answer

D. 795 mV

Explanation

The correct answer is 795 mV.

18Electrical EngineeringMedium

A change in the value of the emitter resistance Re in a differential amplifier?

Adoes not effect either Ad and Ac

Baffects the common mode gain Ac

Caffects the difference mode gain Ad

Daffects both Ad and Ac

Correct answer

B. affects the common mode gain Ac

Explanation

The correct answer is affects the common mode gain Ac.

19Electrical EngineeringMedium

An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is________?

A1/11KΩ

B5KΩ

C11KΩ

D1/5KΩ

Correct answer

A. 1/11KΩ

Explanation

The correct answer is 1/11KΩ.

20Electrical EngineeringMedium

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________?

A1 v

B1.4v

C2v

D2.8v

Correct answer

C. 2v

Explanation

The correct answer is 2v.

In all base driver amplifiers________?

Aac collector voltage is in phase with ac base voltage

Bac emitter voltage is 180° out of phase with ac base voltage

Cac collector voltage is 180° out of phase with ac base voltage

Dnone of the above

Correct answer

C. ac collector voltage is 180° out of phase with ac base voltage

Explanation

The correct answer is ac collector voltage is 180° out of phase with ac base voltage.