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Analog Electronics

Study 46 Electrical Engineering MCQs with correct answers and explanations.

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31Electrical EngineeringMedium

Voltage Series feedback also called series-shunt feedback) results in________?

ADecreases in both input & output impedances

BIncrease in input impedance & decreases in output impedance

CDecrease in input impedance & increase in output impedance

DIncrease in both input & output impedances

Correct answer

B. Increase in input impedance & decreases in output impedance

Explanation

The correct answer is Increase in input impedance & decreases in output impedance.

32Electrical EngineeringMedium

Thermal runaway is not possible in FET because as the temperature of FET increases________?

Athe transconductance increases

Bthe drain current increases

Cnone of the above

Dthe mobility decreases

Correct answer

D. the mobility decreases

Explanation

The correct answer is the mobility decreases.

33Electrical EngineeringMedium

Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in________?

AOnly the temperature

BBoth Temperature & β

CNone of the above

Donly the β of the transistor

Correct answer

B. Both Temperature & β

Explanation

The correct answer is Both Temperature & β.

34Electrical EngineeringMedium

In a transistor leakage current mainly depends on________?

Asize of emitter

Brating of transistor

Cdoping of base

Dtemperature

Correct answer

D. temperature

Explanation

The correct answer is temperature.

35Electrical EngineeringMedium

In an op-amp differentiator:________?

Athe amplitude of output is proportional to rate of change of input

Boutput occurs when input is finite and constant

Cthe amplitude of output is proportional to input

Dpolarity of input and output is the same

Correct answer

A. the amplitude of output is proportional to rate of change of input

Explanation

The correct answer is the amplitude of output is proportional to rate of change of input.

36Electrical EngineeringMedium

Most of the linear ICs are based on the two-transistor differential amplifier because of its________?

Ahigh CMRR

Binput voltage dependent linear transfer characteristic

Chigh input resistance

Dhigh voltage gain

Correct answer

A. high CMRR

Explanation

The correct answer is high CMRR.

37Electrical EngineeringMedium

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________?

A50dB

B23dB

C46dB

D25dB

Correct answer

C. 46dB

Explanation

The correct answer is 46dB.

38Electrical EngineeringMedium

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________?

A1000/7.07 KHz

B1000/17 KHz

C100KHz

D50 KHz

Correct answer

C. 100KHz

Explanation

The correct answer is 100KHz.

39Electrical EngineeringMedium

. If =0.98,Ico=6µA and Iβ=100µA for a transistor,then the value of Ic will be________?

A2.3mA

B5.2mA

C4.6 mA

D3.2mA

Correct answer

B. 5.2mA

Explanation

The correct answer is 5.2mA.

40Electrical EngineeringMedium

In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is________?

AVdc = 2Vm/π, PIV=2vm

BVdc = Vm/π, PIV=Vm

CVdc = Vm/π, PIV=2Vm

DVdc = 2Vm/π, PIV=Vm

Correct answer

A. Vdc = 2Vm/π, PIV=2vm

Explanation

The correct answer is Vdc = 2Vm/π, PIV=2vm.

Voltage Series feedback also called series-shunt feedback) results in________?

ADecreases in both input & output impedances

BIncrease in input impedance & decreases in output impedance

CDecrease in input impedance & increase in output impedance

DIncrease in both input & output impedances

Correct answer

B. Increase in input impedance & decreases in output impedance

Explanation

The correct answer is Increase in input impedance & decreases in output impedance.

In an op-amp differentiator:________?

Athe amplitude of output is proportional to rate of change of input

Boutput occurs when input is finite and constant

Cthe amplitude of output is proportional to input

Dpolarity of input and output is the same

Correct answer

A. the amplitude of output is proportional to rate of change of input

Explanation

The correct answer is the amplitude of output is proportional to rate of change of input.