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Analog Electronics
Amplifiers
Feedback Amplifiers

Questions mapped to Feedback Amplifiers under Amplifiers.

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Q#1 Amplifiers GATE EE 2019 (Set 1) MCQ +1 mark -0.33 marks

A current controlled current source (CCCS) has an input impedance of  and output impedance of . When this CCCS is used in a negative feedback closed loop with a loop gain of 9, the closed loop output impedance is

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Q#2 Amplifiers GATE EE 2013 (Set 1) MCQ +1 mark -0.33 marks

In the feedback network shown below, if the feedback factor k is increased, then the

Input impedance increases and output impedance decreases.

Input impedance increases and output impedance also increases.

Input impedance decreases and output impedance also decreases.

Input impedance decreases and output impedance increases.

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Q#3 Amplifiers GATE EE 2009 (Set 1) MCQ +1 mark -0.33 marks

The nature of feedback in the op-amp circuit shown is

Current - Current feedback

Voltage - Voltage feedback

Current - Voltage feedback

Voltage - Current feedback

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Q#4 Amplifiers GATE EE 2000 (Set 1) MCQ +1 mark -0.33 marks

An analogue electronic circuit that measures rms value of the input voltage by averaging the square of the instantaneous voltage level, responds slowly to changes in the input signal due to

the “square” function built into the circuit

the “square-root” function built into the circuit

the averaging function built into the circuit

None of the above

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Q#5 Amplifiers GATE EE 1996 (Set 1) MCQ +2 marks -0.66 marks

The voltage series feedback in a feedback amplifier leads to

Increase in band width, while the voltage gain becomes less sensitive to variation in components and device characteristics

Decrease in overall gain, while the input resistance decreases

Increase in distortion, while the output resistance decreases

Decrease in input resistance, while the output resistance increases

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Q#6 Amplifiers GATE EE 1994 (Set 1) NAT +1 mark -0 marks

A practical R-C sinusoidal oscillator is built using a positive feedback amplifier with a closed loop-gain slightly less than unity. (True=1, False=0)

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Q#7 Amplifiers GATE EE 1993 (Set 1) MSQ +1 mark -0 marks

A Wien bridge oscillator is shown in figure. Which of the following statements are true, if f is the frequency of oscillation.        

For

For

The gain of the op amp stage should be less than two for proper operation

The gain of the op amp stage should be three for proper operation

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