Transmission of power to a load over a transmission line achieves optimum value when standing-wave ratio (SWR) becomes

1.  2 : 1

2.  1 : 2

3.   1 : 1

4.  1 : √2

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4
Correct Answer :

1 : 1


Explanation :
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The relationship between SWR and Kr of a transmission line is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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The reflection coefficient, characteristic impedance and load impedance of a transmission line are connected together by the relation

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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The noise temperature of sky is about

1.  1000 K

2.  2730 K

3.  00 K

4.  300 K

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4
Correct Answer :

300 K


Explanation :
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The average noise temperature of earth, as viewed from space, is

1.   2540 K

2.  3030 K

3.  1000 K

4.  5000 K

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4
Correct Answer :

2540 K


Explanation :
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Two point charges Q and –Q are located on two opposite corners of a square as shown in the figure. If the potential at the corner A is taken as 1 V, then the potential at B, the centre of the square will be

1.  zero

2.  

3.  1 V

4.  √2 C

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4
Correct Answer :

1 V


Explanation :
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If early voltage VA-100v,JFET output resistance r0 when operating in pitch off at current at 1mA is

1.  1kΩ

2.  10kΩ

3.  100kΩ

4.  1MΩ

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4
Correct Answer :

100kΩ


Explanation :
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An ideal n –channel MOSFEET has parameter =525cm2/v-s,Vt =0.7V t0X=300A.When biased in saturation region at VGS=5V, the required rate current is ID=The required W/L ratio is

1.  9.7

2.  10.7

3.  11.5

4.  12

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4
Correct Answer :

10.7


Explanation :
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For an ideal PMOS, =300cm2/v-s, W=15 , l=1.5 , tox=300A,vt=0.7V. If transistor is operating in non saturation region at VSD=0.5V then gm is

1.  0.172mS

2.  0.501mS

3.  0.242mS

4.  148mS

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4
Correct Answer :

0.172mS


Explanation :
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Consider the following figure: What will be the differential equation for loop (2)

1.  

2.  

3.  

4.  None of these

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4
Correct Answer :


Explanation :
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