In an FM system, a  carrier of 100 MHz  is modulated by a sinusoidal signal of 5 KHz.  The  bandwidth  by Carson’s  approximation  is 1 MHz.  If  y(t) =  (modulated waveform)3, than by using Carson’s approximation, the bandwidth of y(t) around 300 MHz and the and the spacing of spectral components are, respectively

1.  3 MHz, 5 KHz

2.  1 MHz, 15 KHz

3.  3 MHz, 15 KHz

4.  1 MHz, 5 KHz

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4
Correct Answer :

1 MHz, 15 KHz


Explanation :
No Explanation available for this question

A  uniform  plane  wave  in  air  impinges  at  45°  angle  on  a  lossless  dielectric material  with  dielectric  constant  . ε r The  transmitted  wave  propagates  in  a  30° direction with respect to the normal. The value of  ε r is

1.  1.5

2.  √1.5

3.  2

4.  √2

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4
Correct Answer :

√2


Explanation :
No Explanation available for this question

A rectangular wave guide has dimensions 1 cm × 0.5 cm. Its cut-off frequency is

1.  2 dB

2.  5 dB

3.  8 dB

4.  12 dB

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4
Correct Answer :

8 dB


Explanation :
No Explanation available for this question

A rectangular wave guide has dimensions 1 cm × 0.5 cm. Its cut-off frequency is

1.  5 GHz

2.  10 GHz

3.  15 GHz

4.  20 GHz

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4
Correct Answer :

5 GHz


Explanation :
No Explanation available for this question

Two  coaxial  cables  1  and  2  are  filled  with  different  dielectric  constants εr1 and εr2 respectively. The ratio of the wavelengths in the two cables, (λ1/ λ2) is

1.  √ εr1/ εr2

2.  √ εr2/ εr1

3.  εr1/ εr2

4.  εr2/ εr1

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4
Correct Answer :

εr1/ εr2


Explanation :
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A system has a phase response given by φ(ω), where ω is the angular frequency. The phase delay and group delay at ω = ωo are respectively given by

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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Identify which of the following is NOT a true of the graph shown in the given figure is

1.  begh

2.  defg

3.  adfg

4.  aegh

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4
Correct Answer :

adfg


Explanation :
No Explanation available for this question

The z-transform F(z) of the function f(nT) =anTis

1.     z/z-aT

2.  z/z+aT 

3.  z/z-a-T

4.  z/z+a-T

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4
Correct Answer :

 

z/z-aT


Explanation :
No Explanation available for this question

If [f(t)]=F(s),then [f(t-T)]is equal to

1.   esT F(s)  

2.  e-sT F(s)

3.  F(s)/(1- esT)

4.  F(s)/(1- e-sT)

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4
Correct Answer :

e-sT F(s)


Explanation :
No Explanation available for this question

A 2-port network is shown in the given figure.The parameter h21 for this network can be given by  

1.   -1/2        

2.  ½

3.  -3/2

4.  3/2

View Answer  
4
Correct Answer :

-1/2        


Explanation :
No Explanation available for this question
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