If an amplifier with gain of -1000 and feedback of β=-0.1 had a gain change of 20% due to temperature, then change in gain of the feedback amplifier would be

1.  10%

2.  5%

3.  0.2%

4.  0.01%

View Answer  
4
Correct Answer :

0.2\%


Explanation :
No Explanation available for this question

The mean square value of a variable with probability densityfunction P(x)=3e-6|x,|, -∞

1.  1/3

2.  1/6

3.  1/9

4.  1/18

View Answer  
4
Correct Answer :

1/18


Explanation :
No Explanation available for this question

In a bipolar transistor base transistor time is 25% of the total delay time. Base width is 0.5 μm and base diffusion coefficient is DB=20cm2/s. The cutoff frequency is

1.  637 MHz

2.  436 MHz

3.  12.8 MHz

4.  46.3GHz

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4
Correct Answer :

637 MHz


Explanation :
No Explanation available for this question

Zener breakdown diodes have breakdown which

1.  Has positive temperature coefficient

2.  Has negative temperature coefficient

3.  Is independent of temperature

4.  None of these

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4
Correct Answer :

Has negative temperature coefficient


Explanation :
No Explanation available for this question

Y=X2 is a zero mean stationary Gaussian random process with auto correction for Rxx=exp(-|t|), Ryy(t1, t2) will be

1.  1-2 exp(-2|t|)

2.  1+2 exp(-2|t|)

3.  1-4 exp(-2|t|)

4.  1+4 exp(-2|t|)

View Answer  
4
Correct Answer :

1+2 exp(-2|t|)


Explanation :
No Explanation available for this question

In case of an amplifier, normalized voltage gain is given by Av/A0=1/1+(R’/R).1+j(f/f0)/1+j(f/fp) Where f0 is zero frequency and fp is pole frequency. For a standard frequency response of the amplifier

1.  fp f0

2.  fp=f0

3.  fp? f0

4.  none of these

View Answer  
4
Correct Answer :

fp f0


Explanation :
No Explanation available for this question

White noise with power density η0/2 is applied to a low pass network for which |H(0)|=2. It has a noise band width of 2Mhz. If average output noise power is 8.1 W in a 1W resistor, then η0 is

1.  6.25x108W/Hz

2.  6.25x10-8W/Hz

3.  1.25x108W/Hz

4.  6.25x10-8W/Hz

View Answer  
4
Correct Answer :

6.25x10-8W/Hz


Explanation :
No Explanation available for this question

The dissipation at the collector is zero in the quiescent state and increase with excitation in the case of a

1.  Class A series fed amplifier

2.  Class A transistor coupled amplifier

3.  Class AB amplifier

4.  Class B amplifier

View Answer  
4
Correct Answer :

Class B amplifier


Explanation :
No Explanation available for this question

Fourier transform of a Gaussian time pulse is

1.  uniform

2.  a pair of impulses

3.  Gaussian

4.  Rayleigh

View Answer  
4
Correct Answer :

Gaussian


Explanation :
No Explanation available for this question

The autocorrelation function Rx(t) satisfies which of the following properties

1.  Rx(t)=-Rx(-t )

2.  Rx(t)=-Rx(-t )

3.  Rx(t)≥-Rx(0 )

4.   Rx(t)≥1

View Answer  
4
Correct Answer :

Rx(t)=-Rx(-t )


Explanation :
No Explanation available for this question
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