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What is mesh and nodal analysis?

Recent questions and answers in Amplifier

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If the feedback factor of an amplifier is 0.1 and its gain without feedback is 40, then its gain with feedback is (a) – 13.3 (b) 200 (c) 8 (d) 10 

answered Nov 11, 2018 in Amplifier
0 answers 30 views
1 answer 26 views

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 

answered Jun 18, 2018 in Amplifier
1 answer 23 views

When the initial slope of input sine wave is greater than the slew rate of an OPAMP, the output: (1) Has no offset (2) Approaches to triangular waveshape (3) Is pure sinusoidal (4) Is square wave 

answered May 29, 2018 in Amplifier
1 answer 12 views

The ideal operational amplifier does not have: (1) Infinite input resistance (2) Infinite output resistance (3) Infinite voltage gain (4) Infinite bandwidth 

answered May 29, 2018 in Amplifier
1 answer 26 views

An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and 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 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ

answered May 29, 2018 in Amplifier
1 answer 17 views

The gain of an FET amplifier can be changed by changing: (1) rm (2) gm (3) Rd (4) None of these

answered May 28, 2018 in Amplifier
0 answers 10 views

The amplifier having the highest amount of distortion is (a) Class A (b) Class B (c) Class C (d) Class AB 

asked May 25, 2018 in Amplifier
0 answers 14 views

If the emitter resistance ‘Re ’ in a transistor amplifier is removed, then (a) base to emitter junction will be less forward biased. (b) gain of amplifier decreases. (c) Q-point becomes unstable. (d) All of these 

asked May 25, 2018 in Amplifier
0 answers 14 views

A high-Q tuned circuit in an amplifier permits to have high (a) selectivity (b) fidelity (c) sensitivity (d) frequency ranges

asked May 25, 2018 in Amplifier
0 answers 7 views

Push-pull amplifier circuit is used as (a) RF amplifier (b) audio amplifier (c) power amplifier (d) current amplifier

asked May 25, 2018 in Amplifier
1 answer 28 views

A low noise amplifier has an effective noise temperature of 50 k. The absolute noise figure is

answered May 23, 2018 in Amplifier
1 answer 15 views

An amplifier operating over the frequency range from 18 to 20 MHz has 10 kilo ohm input resistor. What is the r.m.s. noise voltage at the input to this amplifier if the ambient temperature is 27o C

answered May 23, 2018 in Amplifier
1 answer 21 views

For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

answered May 23, 2018 in Amplifier
1 answer 12 views

For Cascode amplifier the output impedance becomes 

answered May 23, 2018 in Amplifier
1 answer 11 views

Negative feed back:

answered May 22, 2018 in Amplifier
1 answer 28 views

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

answered May 20, 2018 in Amplifier
1 answer 11 views

An operational amplifier has an open loop gain of 200,000. Its output exhibits saturation at 10V. The threshold differential voltage of the amplifier is  A) 25 micro-volt B) 50 micro-volt C) 5 Volts D) 10 volts

answered May 20, 2018 in Amplifier
1 answer 14 views

The amplifiers following the modulated stage in a low level modulation AM system be  (A) linear amplifier (B) harmonic generators (C) class C power amplifiers (D) class untuned amplifiers

answered May 17, 2018 in Amplifier
1 answer 14 views

In a radio receiver the IF amplifier  (A) is tuned above the stations incoming frequency (B) amplifies the output of local oscillator (C) is fixed tuned to one particular frequency (D) can be tuned to various isolate frequencies

answered May 17, 2018 in Amplifier
1 answer 13 views

Class A amplifier is used when  (A) No phase inversion is required (B) Highest voltage gain is required (C) dc voltages are to be amplified (D) Minimum distortion is desired. 

answered May 17, 2018 in Amplifier
1 answer 14 views

Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will   (A) Amplify the noise as much as the signal (B) Reduce the noise (C) Increase the noise (D) Not effect the noise

answered May 17, 2018 in Amplifier
1 answer 13 views

In an IF amplifier, the IF transformer is provided with tapping to  (a) increase the voltage gain (b) increase the bandwidth of the resonance circuit (c) increase the impedance offered by the resonance circuit to the following cascaded amplifier (d) increase the quality factor of the resonance circuit 

answered May 15, 2018 in Amplifier
1 answer 14 views

In a Klystron amplifier, the RF voltage produces  (a) amplitude modulation (b) frequency modulation (c) phase modulation (d) velocity modulation

answered May 15, 2018 in Amplifier
1 answer 13 views

In class - A power amplifier, the collector dissipation is maximum when  (a) no signal is present  (b) signal swing is maximum  (c) signal swing is (1/1.414) of its maximum  (d) none of the above

answered May 15, 2018 in Amplifier
1 answer 23 views

In Class ‘B’ amplifier, the output current flows for

answered May 15, 2018 in Amplifier
1 answer 11 views

An Op-amp as a voltage follower has a voltage gain of

answered May 14, 2018 in Amplifier
1 answer 11 views

The efficiency of a class B push-pull amplifier is

answered May 14, 2018 in Amplifier
1 answer 13 views

The transistor configuration to connect 4 W speaker with 600 W output impedance audio amplifier is • Common Emitter • Common Base • Common Collector • None of the above.

answered May 14, 2018 in Amplifier
1 answer 18 views

Which of the following amplifier has the least distortion. • Class E • Class D • Class C • Class A

answered May 14, 2018 in Amplifier
1 answer 8 views

The battery operated pre-amplifier with a consumption of 10 Watts can work on battery of 12 volt, 100 AH having efficiency of 50% for • 120 hrs. • 60 hrs. • 100 hrs. • 10 hrs.

answered May 14, 2018 in Amplifier
1 answer 8 views

The input impedance of an op-amp is • High • Low • Medium • None of the above

answered May 14, 2018 in Amplifier
1 answer 12 views

An OP-AMP can be classified as  1.Linear amplifier 2.Low - Rin amplifier 3.Positive - feedback amplifier 4.RC - coupled amplifier 

answered May 13, 2018 in Amplifier
1 answer 12 views

In class-A amplifier conduction extends over 360° because the operating point.  1. Located near saturation point 2. Located at or near cut-off point 3. Located on load line 4. Located in the centre of load line 

answered May 13, 2018 in Amplifier
1 answer 23 views

The voltage gain of a common base amplifier depends on  1. Load resistor RL 2. input resistance of transistor 3. Ac alpha 4. All the above 

answered May 13, 2018 in Amplifier
1 answer 20 views

Cross over distortion in class - B push-p amplifiers:  1. Is due to transistor operating near saturation region  2. Can be eliminated by operating them in class operation  3. Occurs because two power transistors do not exactly matching parameters  4. Always occurs in low signal area

answered May 13, 2018 in Amplifier
1 answer 10 views

Just as a voltage amplifier signal voltage a power amplifier.  1.amplifier power  2.amplifier signal  3.converts the signal ac power into DC power  4.converts a dc power into useful AC power 

answered May 13, 2018 in Amplifier
1 answer 9 views

Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is  (A) The transistor itself  (B) the power supply Vcc  (C) the coupling capacitor Cc  (D) the biasing resistors

answered May 12, 2018 in Amplifier
1 answer 24 views

The main component responsible for the fall of gain of an RC coupled amplifier in low frequency range is  (A) The active device itself (tube, or transistor)  (B) stray shunt capacitance Cs  (C) the grid leak resistance Rg  (D) coupling capacitor Cc

answered May 12, 2018 in Amplifier
1 answer 54 views

The main function of the transformer used in the output of a power amplifier is  (A) To step up the voltage  (B) to increase the voltage gain  (C) to safeguard the transistor against overheating  (D) to match the load impedance with dynamic output resistance of the transistor

answered May 12, 2018 in Amplifier
1 answer 17 views

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

answered May 12, 2018 in Amplifier
1 answer 11 views

In op-amp operation, Common Mode Rejection Ratio (CMRR)

answered May 12, 2018 in Amplifier
1 answer 15 views

What is the importance of negative feedback in the operational amplifier? (A) It maintains the gain (B) The voltage difference between the input terminals is maintained at a very small value (C) The voltage difference between the input terminals is maintained at a constant value (D) The voltage difference between the input terminals is maintained at a very high value

answered May 12, 2018 in Amplifier
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