In a Direct Sequence CDMA system the chip rate is 1.2288 x 106 chips per second. If the processing gain is desired to be AT LEAST 100, the data rate

1.  must be less than or equal to 12.288 x 103 bits per sec

2.  must be greater than 12.288 x 103 bits per sec

3.  must be exactly equal to 12.288 x 103 bits per sec

4.  can take any value less than 122.88 x 103 bits per sec

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4
Correct Answer :

must be less than or equal to 12.288 x 103 bits per sec


Explanation :
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An  air-filled  rectangular  waveguide  has  inner  dimensions  of  3  cm  x  2  cm.  The  wave impedance of the TE20 mode of propagation in the waveguide at a frequency of 30 GHz is (free space impedance η0 = 377 Ω)

1.  308 Ω

2.  355 Ω

3.  400 Ω

4.  461 Ω

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4
Correct Answer :

400 Ω


Explanation :
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The   field (in A/m) of a plane wave propagating in free space is given by H =   (5√(3)/η0) cos (ωt - βz) +   (5/η0) sin (ωt - βz + (π/2)). The time average power flow density in Watts is

1.  η0/100

2.  100/η0

3.  50 η02

4.  50/η0

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4
Correct Answer :

50/η0


Explanation :
No Explanation available for this question

field in a rectangular waveguide of inner dimensions a × b is given by  where H0  is a constant, and a and b are  the dimensions along  the x-axis and  the y-axis respectively. The mode of propagation in the waveguide is

1.  TE20  

2.  TM11

3.  TM20

4.  TE10

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4
Correct Answer :

TE20

 


Explanation :
No Explanation available for this question

A load of 50 Ω is connected in shunt in a 2-wire transmission line of Z0 = 50 Ω as shown in the figure. The 2-port scattering parameter matrix (S - matrix) of the shunt element is

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

The  parallel  branches  of  a  2-wire  transmission  line  are  terminated  in  100  Ω  and  200  Ω resistors as shown in the figure. The characteristic impedance of the line is Z0 = 50 Ω and each section has a length of (λ0/2). The voltage reflection coefficient I- at the input is

1.  -j(7/5)

2.  ((-5)/7)

3.  j(5/7)

4.  5/7

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Correct Answer :

5/7


Explanation :
No Explanation available for this question

A λ/2   dipole  is  kept horizontally at a height of  λ 0/2  above  a  perfectly  conducting  infinite ground  plane.  The  radiation  pattern  in  the  plane  of  the  dipole  (   plane)  looks approximately as

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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A right circularly polarized (RCP) plane wave is incident at an angle of 60º  to  the normal. on  an  air-dielectric  interface.  If  the  reflected  wave  is  linearly  polarized,  the  relative dielectric constant εr2 is

1.  √2

2.  √3

3.  2

4.  3

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4
Correct Answer :

3


Explanation :
No Explanation available for this question

The gate oxide thickness in the MOS capacitor is

1.  50 nm

2.  143 nm

3.  350 nm

4.  1 μm

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4
Correct Answer :

50 nm


Explanation :
No Explanation available for this question

The maximum depletion layer width in silicon is

1.  0.143 μm

2.  0.857 μm

3.  1 μm

4.  1.143 μm

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4
Correct Answer :

0.857 μm


Explanation :
No Explanation available for this question
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