In  figure  2.19  m(t)= 2sin2πt/t , S(t)=cos200πt and n(t) =sin199πt/t the output y(t) will be

1.  Sin2πt/t

2.  Sin 2πt/t+ sinVt/t cos 3Vt

3.  Sin 2πt/t+ sin 0.5πt/t  cos 1.5πt

4.  Sin 2πt/t+ sin πt/t cos 0.75πt

View Answer  
4
Correct Answer :

Sin 2πt/t+ sin πt/t cos 0.75πt


Explanation :
No Explanation available for this question

A signal x(t) = 100 cos(24π×103)t is ideally sampled with a sampling period of 50 µsec and then passed through an ideal low-pass filter with cutoff frequency of 15 KHz. Which of the following frequencies is/are present at the filter output

1.   12 KHz only

2.  8 KHz only

3.  12 KHz and 9 KHz

4.  12 KHz and 8 KHz

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4
Correct Answer :

12 KHz and 9 KHz


Explanation :
No Explanation available for this question

If  the  varianceσ2x of d(n)=x(n)-x(n-1) is one-tenth the variance σ2x of a stationary zero mean discrete time signal  x(n), then the normalized autocorrelation function Rxx(k)/ σ2x at k=1 is

1.  0.95

2.  0.90

3.  0.10

4.  0.05

View Answer  
4
Correct Answer :

0.95


Explanation :
No Explanation available for this question

A plane wave is characterized by This wave is

1.  linearly polarized 

2.  circularly polarized

3.  elliptically polarized

4.  unpolarized

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4
Correct Answer :

elliptically polarized


Explanation :
No Explanation available for this question

Distilled water at 25° C is characterized by σ = 1.7 × 10-4mho/m and ∈=78∈0 at  a frequency of 3 GHz. Its loss tangent tan δ is (∈ = 10-9/(36π)F/m)

1.   1.3 × 10-5

2.  1.3 × 10-3

3.  1.7 × 10-4/78

4.  1.7 × 10-4/(78∈0)

View Answer  
4
Correct Answer :

1.7 × 10-4/78


Explanation :
No Explanation available for this question

The electric field on the surface of a perfect conductor is 2 V/m. The conductor is immersed in water with ∈=80∈0. The surface charge density on the conductor is (∈ = 10-9 /(36π)F/m)

1.   0 C/m2  

2.  2 C/m2

3.  1.8 × 10-11 C/m2

4.  1.14 × 10-9C/m2

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4
Correct Answer :

2 C/m2


Explanation :
No Explanation available for this question

The oscillator circuit shown in the figure,

1.  Hartley oscillator with foscillation=79.6MHz

2.  Colpitts oscillator with foscillation=79.6MHz

3.  Hartley oscillator with foscillation=159.2MHz

4.  Colpitts oscillator with foscillation=159.2MHz

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4
Correct Answer :

Colpitts oscillator with foscillation=79.6MHz


Explanation :
No Explanation available for this question

The inverting OP-AMP shown in the figure has an open-loop gain of 100.The closed-loop gain v0/vs is

1.  -8

2.  -9

3.  -10

4.  -11

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4
Correct Answer :

-11


Explanation :
No Explanation available for this question

The open-loop DC gain of a unity negative feedback system with closed-loop transfer function (s+4)/(s2+7s+13) is

1.   4/13

2.  4/9

3.  4

4.  13

View Answer  
4
Correct Answer :

4/9


Explanation :
No Explanation available for this question

In the figure, assume the OP-AMP to be ideal.The output V0 of the circuit is

1.  10 cos(100t)

2.  

3.  

4.  

View Answer  
4
Correct Answer :

10 cos(100t)


Explanation :
No Explanation available for this question
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