For a class B amplifier providing a 20V peak signal to 16Ω load and a power supply of Vcc=30V, efficiency will be

1.  52.3%

2.  25.65%

3.  75%

4.  78.6%

View Answer  
4
Correct Answer :

52.3\%


Explanation :
No Explanation available for this question

If a two-stage amplifier is required to have an upper cut-off frequency of 2 MHz and a lower cut-off frequency of 30 Hz then upper and lower cut-off frequencies of individual stage are respectively

1.  4MHz, 60Hz

2.  3MHz, 20Hz

3.  3 MHz, 60Hz

4.   4MHz,20Hz

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4
Correct Answer :

3MHz, 20Hz


Explanation :
No Explanation available for this question

for a transistor, parameters are β=180 and VA=150V, and it is biased at ICQ=2mA. If collector of the transistor is connected to the base terminal, then small signal resistance re=vce/ic of this two-terminal device is

1.  12.88kΩ

2.  12.87Ω

3.  2.33Ω

4.   1.53Ω

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4
Correct Answer :

12.87Ω


Explanation :
No Explanation available for this question

In the single stage transistor amplifier circuit shown in the figure, if capacitor CE is removed, then ac small signal midband voltage gain of the amplifier will

1.  Increase

2.  Decrease

3.  Remain unaffected

4.   Drop to zero

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4
Correct Answer :

Decrease


Explanation :
No Explanation available for this question

A signal may have frequency components whichlie in the range of 0.001Hz to 10Hz. Which of the following types of coupling should be chosen in a multistage amplifier designed to amplify this signal

1.  Rc coupling

2.  Transformer coupling

3.  Direct coupling

4.   Double-tuned coupling

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4
Correct Answer :

Direct coupling


Explanation :
No Explanation available for this question

Class AB operation is often used in power(large signal) amplifiers in order to

1.  Get maximum efficiency

2.  Remove even harmonics

3.  Overcome a cross-over distortion

4.   Reduce collector dissipation

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4
Correct Answer :

Overcome a cross-over distortion


Explanation :
No Explanation available for this question

Consider self biased circuit given in the figure. If driven by a current source

1.  It will no more work as self-biased circuit

2.  Circuit would stabilize operating point as in the case when driven by voltage source

3.  Stability can be increased with small value of Re

4.   Stability can be increased with increase of α of the transistor

View Answer  
4
Correct Answer :

It will no more work as self-biased circuit


Explanation :
No Explanation available for this question

A junction transistor operating at room temperature with Ic =2 mA, where =20 mV and β=100. The value of parameter gm in mho and rπ in ohm respectively are

1.  0.04 and 2500

2.  0.08 and 1250

3.  0.5 and 800

4.   0.08 and 5000

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4
Correct Answer :

0.08 and 1250


Explanation :
No Explanation available for this question

If an input signal with non-zero dc component is applied to a ow pass RC network, then dc component in the output will be

1.  Same as that in the input

2.  Less than that in the input

3.  More than that in the input

4.   Zero

View Answer  
4
Correct Answer :

Same as that in the input


Explanation :
No Explanation available for this question

In the single-stage transistor amplifier circuit shown in the given figure, if capacitor CE is removed, then, ac small-signal midband voltage gain of the amplifier

1.  Increases

2.  Decreases

3.  Is unaffected

4.   Drops to zero

View Answer  
4
Correct Answer :

Decreases


Explanation :
No Explanation available for this question
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