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Analog Electronics

Study 46 Electrical Engineering MCQs with correct answers and explanations.

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1Electrical EngineeringMedium

A differential amplifier has a differential gain of 20,000. CMRR=80 dB. The common mode gain is given by________?

D1/2

Correct answer

C. 2

Explanation

The correct answer is 2.

2Electrical EngineeringMedium

A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation,respectively are________?

A25 Ω & 20 %

B5 Ω & 16.7 %

C25 Ω & 16.7 %

D5 Ω & 20 %

Correct answer

A. 25 Ω & 20 %

Explanation

The correct answer is 25 Ω & 20 %.

3Electrical EngineeringMedium

An OPAMP has a slew rate of 5 V/μ 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/μS.

A5 volts

B5/1 volts

C5/2 volts

D10 volts

Correct answer

C. 5/2 volts

Explanation

The correct answer is 5/2 volts.

4Electrical EngineeringMedium

A source follower using an FET usually has a voltage gain which is________?

Aabout -10

Bslightly less than unity but positive

Cexactly unity but negative

Dgreater than +100

Correct answer

D. greater than +100

Explanation

The correct answer is greater than +100.

5Electrical EngineeringMedium

In deriving ac equivalent circuit for an amplifier circuit, we short circuit________?

Aall resistors

Ball inductors

Call transistors

Dall capacitors

Correct answer

D. all capacitors

Explanation

The correct answer is all capacitors.

6Electrical EngineeringMedium

MOSFET can be used as a________?

Avoltage controlled inductors

Bvoltage controlled capacitor

Ccurrent controlled capacitor

Dcurrent controlled inductor

Correct answer

B. voltage controlled capacitor

Explanation

The correct answer is voltage controlled capacitor.

7Electrical EngineeringMedium

The most commonly used amplifier in sample & hold circuits is________?

AAn inverting amplifier with a gain of 10

BA unity gain inverting amplifier

CA unity gain non-inverting amplifier

DAn inverting amplifiers with a gain of 100

Correct answer

B. A unity gain inverting amplifier

Explanation

The correct answer is A unity gain inverting amplifier.

8Electrical EngineeringMedium

In a p-n junction diode under reverse bias, the magnitude of electric field is maximum at________?

Athe edge of the depletion region on the p-side

Bthe p-n junction

Cthe center of the depletion region on the n-side

Dthe edge of the depletion region on the n-side

Correct answer

B. the p-n junction

Explanation

The correct answer is the p-n junction.

9Electrical EngineeringMedium

The MOSFET switch in its on-state may be considered equivalent to________?

Abattery

Bresistor

Cinductor

Dcapacitor

Correct answer

D. capacitor

Explanation

The correct answer is capacitor.

10Electrical EngineeringMedium

The bandwidth of an RF tuned amplifier is dependent on________?

AQuiescent operating point

BQ –factor of the tuned i/p circuit

CQ-factor of the o/p and i/p circuits as well as quiescent operating point

DQ –factor of the tuned o/p circuit

Correct answer

D. Q –factor of the tuned o/p circuit

Explanation

The correct answer is Q –factor of the tuned o/p circuit.

1Electrical EngineeringMedium

A differential amplifier has a differential gain of 20,000. CMRR=80 dB. The common mode gain is given by________?

D1/2

Correct answer

C. 2

Explanation

The correct answer is 2.

2Electrical EngineeringMedium

A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation,respectively are________?

A25 Ω & 20 %

B5 Ω & 16.7 %

C25 Ω & 16.7 %

D5 Ω & 20 %

Correct answer

A. 25 Ω & 20 %

Explanation

The correct answer is 25 Ω & 20 %.

3Electrical EngineeringMedium

An OPAMP has a slew rate of 5 V/μ 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/μS.

A5 volts

B5/1 volts

C5/2 volts

D10 volts

Correct answer

C. 5/2 volts

Explanation

The correct answer is 5/2 volts.

4Electrical EngineeringMedium

A source follower using an FET usually has a voltage gain which is________?

Aabout -10

Bslightly less than unity but positive

Cexactly unity but negative

Dgreater than +100

Correct answer

D. greater than +100

Explanation

The correct answer is greater than +100.

5Electrical EngineeringMedium

In deriving ac equivalent circuit for an amplifier circuit, we short circuit________?

Aall resistors

Ball inductors

Call transistors

Dall capacitors

Correct answer

D. all capacitors

Explanation

The correct answer is all capacitors.

6Electrical EngineeringMedium

MOSFET can be used as a________?

Avoltage controlled inductors

Bvoltage controlled capacitor

Ccurrent controlled capacitor

Dcurrent controlled inductor

Correct answer

B. voltage controlled capacitor

Explanation

The correct answer is voltage controlled capacitor.

7Electrical EngineeringMedium

The most commonly used amplifier in sample & hold circuits is________?

AAn inverting amplifier with a gain of 10

BA unity gain inverting amplifier

CA unity gain non-inverting amplifier

DAn inverting amplifiers with a gain of 100

Correct answer

B. A unity gain inverting amplifier

Explanation

The correct answer is A unity gain inverting amplifier.

8Electrical EngineeringMedium

In a p-n junction diode under reverse bias, the magnitude of electric field is maximum at________?

Athe edge of the depletion region on the p-side

Bthe p-n junction

Cthe center of the depletion region on the n-side

Dthe edge of the depletion region on the n-side

Correct answer

B. the p-n junction

Explanation

The correct answer is the p-n junction.

9Electrical EngineeringMedium

The MOSFET switch in its on-state may be considered equivalent to________?

Abattery

Bresistor

Cinductor

Dcapacitor

Correct answer

D. capacitor

Explanation

The correct answer is capacitor.

10Electrical EngineeringMedium

The bandwidth of an RF tuned amplifier is dependent on________?

AQuiescent operating point

BQ –factor of the tuned i/p circuit

CQ-factor of the o/p and i/p circuits as well as quiescent operating point

DQ –factor of the tuned o/p circuit

Correct answer

D. Q –factor of the tuned o/p circuit

Explanation

The correct answer is Q –factor of the tuned o/p circuit.