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How does negative feedback reduces distortion in an amplifier?
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Description :

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is  (1) 141 (2) 92.3 (3) 9.23 (4) 1.41

Answer :

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is 9.23

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Description :

The effect of negative feedback on distortion and bandwidth is A) Both distortion and bandwidth get decreased B) Both distortion and bandwidth get increased C) Distortion is reduced and bandwidth is increased D) Distortion is increased and bandwidth is decreased 

Answer :

The effect of negative feedback on distortion and bandwidth is Distortion is reduced and bandwidth is increased

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Description :

Negative feedback in a closed-loop control system DOES NOT (A) reduce the overall gain (B) reduce bandwidth (C) improve disturbance rejection (D) reduce sensitivity to parameter variation

Answer :

Negative feedback in a closed-loop control system DOES NOT reduce bandwidth

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Description :

Compare positive and negative feedback.

Answer :

Sr. No. Parameter Positive feedback  Negative feedback 1 BW Increases Decreases 2 Feedback signal In phase with the input signal. 180 º out of phase ... impedance increases decreases 9 Uses Oscillators, Schmitt trigger Amplifiers, bootstrapping

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101 views 1 answer
Description :

Write advantages and disadvantages of positive and negative feedback.

Answer :

Advantages of Positive Feedback: i) Voltage gain increases. ii) No phase shift is provided. iii) Feedback signal and input signal are in phase. iv) Input and Output voltage increases.  ... ii) Feedback signal and input signal are out of phase. iii) Input and Output voltage decreases.

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2.7k views 1 answer
Description :

Differentiate between positive and negative feedback.

Answer :

PARAMETER POSITIVE FEEDBACK NEGATIVE FEEDBACK Overall phase shift 0° or 360° 180° Feedback and input signal Are in phase Are out of phase Input signal ... Increases Input impedance Decreases Increases Output impedance Increases Decreases

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119 views 1 answer
Description :

Define negative and positive feedback

Answer :

1. Negative feedback: Feedback in which feedback signal is out of phase with input signal and it decreases output is called negative feedback.  2. Positive feedback: Feedback in which feedback signal is in phase with input signal and it increases output is called positive feedback. 

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83 views 1 answer
Description :

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1

Answer :

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system crosses the real axis at -0.1.

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112 views 1 answer
Description :

What is meant by distortion in amplifiers?

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Description :

The second harmonic distortion is defined as the A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency B) Harmonic distortion due to only second harmonic component C) Sum of distortion of first and second harmonic components in the output 

Answer :

The second harmonic distortion is defined as the Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency

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Description :

Transformer coupling introduces which type of distortion?

Answer :

Transformer coupling introduces Cross over distortion.

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Description :

 advantages of negative feedback over positive feedback.

Answer :

Advantages of negative feedback over positive feedback: 1. Higher fidelity i.e. more linear operation. 2. Highly stabilized gain. 3. Increased bandwidth i.e. improved frequency response. 4. Less ... . 8. Input and output impedance can be modified as desired. 9. Less frequency distortion.

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133 views 1 answer
Description :

How does an operational amplifier work?

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61 views 0 answers
Description :

Elaborate why the section of a sprue reduces downwards.

Answer :

A sprue section reduces downwards to a smaller size at its bottom will create a choke which will help keep the sprue full of molten metal. 

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19 views 1 answer
Description :

Power generation cost reduces as (A) Diversity factor increases and load factor decreases. (B) Diversity factor decreases and load factor increases. (C) Both diversity factor and load factor increase. (D) Both diversity factor and load factor decrease

Answer :

Power generation cost reduces as Both diversity factor and load factor increase.

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68 views 1 answer
Description :

Why does charge flow from positive to negative?

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Description :

working of distortion factor meter with block diagram

Answer :

Working : Initially the switch S is kept at position 1.The attenuator gets excluded and the bridge T network is adjusted for full suppression of fundamental frequency and hence we get ... is obtained on the meter.Thus the total rms distortion is indicated by the reading of attenuator. 

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650 views 1 answer
Description :

Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode

Answer :

Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode

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Description :

Which side of a capacitor is negative?

Answer :

In electrolytic type negative is shorter lead and usually mark in the tank. But of course not applicable to non-polar.

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141 views 1 answer
Description :

The voltage gains of the amplifier with and without feedback are 20 and 100 respectively. The percentage of negative feedback would be

Answer :

The voltage gains of the amplifier with and without feedback are 20 and 100 respectively. The percentage of negative feedback would be 4%

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102 views 1 answer
Description :

The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

Answer :

The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit

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Description :

What is stability in an amplifier?

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Description :

How can BJT be used as an amplifier?

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Description :

Is an anode positive or negative?

Answer :

The anode is positively charged electrode.

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Description :

What is meant by feedback in electronics?

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Description :

Why feedback is required in oscillators?

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Description :

different types of feedback amplifiers

Answer :

Types of feedback amplifiers: 1. Positive feedback amplifiers 2. Negative feedback amplifiers (i)voltage series feedback amplifiers (ii)voltage shunt feedback amplifiers (iii)current series feedback amplifiers (iv)current shunt feedback amplifiers

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Description :

Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

Answer :

Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16

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Description :

Answer :

Active region of BJT act as amplifier.

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Description :

A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

Answer :

A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

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271 views 1 answer
Description :

What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Answer :

What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

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Description :

Which one of the following is another name for common-collector amplifier?  A) Source follower B) Collector follower C) Base follower D) Emitter follower

Answer :

Which one of the following is another name for common-collector amplifier?  A) Source follower B) Collector follower C) Base follower D) Emitter follower

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67 views 1 answer
Description :

A negative sequence relay is used for protection of  (1) Generator (3) Motor (2) Transformer (4) Long Transmission lines

Answer :

A negative sequence relay is used for protection of Generator 

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465 views 1 answer
Description :

A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

Answer :

Leading

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2.0k views 2 answers
Description :

The transducer with negative temperature co-efficient of resistance is (A) Thermistor (B) Resistance Thermometer (C) Strain Gauge (D) Thermocouple

Answer :

The transducer with negative temperature co-efficient of resistance is Thermistor

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69 views 1 answer
Description :

Negative voltage regulation is indicative that the load is?

Answer :

Negative voltage regulation is indicative that the load is capacitive.

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141 views 1 answer
Description :

Define gain and bandwidth of an amplifier.

Answer :

Bandwidth  The range of frequency over which the voltage gain is equal to or greater than 70.7% of its maximum value Gain: The ratio of output parameter (voltage/ current /power) to the input parameter (voltage/ current /power) of an amplifier is known as gain. It is denoted by a letter A

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Description :

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

Answer :

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

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96 views 1 answer
Description :

An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be

Answer :

An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be 2 watts

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287 views 1 answer
Description :

The gain of an ideal amplifier must be

Answer :

The gain of an ideal amplifier must be infinity

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75 views 1 answer
Description :

What do you mean by frequency response of an amplifier?

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84 views 0 answers
Description :

Negative feedback in amplifier:  (1) Improves the SNR at input (2) Improve SNR at output (3) Reduces distortion (4) Decreases bandwidth

Answer :

Negative feedback in amplifier: Reduces distortion.

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Description :

Negative feedback in an amplifier is accompanied by (A) Gain less sensitive to component variations (B) Increase in gain (C) Decrease in bandwidth (D) None of the above

Answer :

Negative feedback in an amplifier is accompanied by Gain less sensitive to component variations 

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Description :

An amplifier without feedback has a gain of 1000. The gain with a negative feedback of 0.009 is  A) 10 B) 100 C) 125 D) 900

Answer :

An amplifier without feedback has a gain of 1000. The gain with a negative feedback of 0.009 is 100 

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162 views 1 answer
Description :

With the introduction of negative feedback, the gain—bandwidth product of an amplifier  A) Becomes infinity B) Increases C) Decreases D) Remains constant

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Description :

role of tuned LC circuit in tuned amplifier.

Answer :

In order to pick up and amplify the desired radio frequency signal, the resistive load in the audio amplifier is replaced by a tuned circuit (also called a parallel resonant circuit)as shown ... desired radio frequency signal. (ii)Amplification of the selected signal to a suitable voltage level.

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Description :

What type of biasing is used in CE amplifier?

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Description :

Answer :

The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.

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Description :

working of class B push pull amplifier.

Answer :

Circuit Diagram:- Operation:  In class B amplifier transistor conduct only for half cycle of input signal.One conduct in positive half cycle and other conducts in negative half ... Then output transformer joins these two halves and produces a full sine wave in the load resistor. 

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