If S(f) is the power spectral density of a real, wide-sense stationary random process, then which of the following is ALWAYS true

1.  S(0) ≥ S(f)

2.  S(f) ≥ 0

3.  S(-f) = -S(f)

4.  

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4
Correct Answer :

S(f) ≥ 0


Explanation :
No Explanation available for this question

A plane wave of wavelength λ is travelling in a direction making an angle 30° with positive x-axis and 90° with positive y-axis. The    field of  the plane wave can be  represented as (E0 is a constant)

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

If C is a closed curve enclosing a surface S, then the magnetic field intensity   the current density   and the electric flux density   are related by

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question

Consider the function f(x) = x2 - x - 2. The maximum value of f(x) in the closed interval [-4,4] is

1.  18

2.  10

3.  -2.25

4.  indeterminate

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4
Correct Answer :

18


Explanation :
No Explanation available for this question

An examination consists of  two papers, Paper 1 and Paper 2. The probability of  failing  in Paper 1  is 0.3 and  that  in Paper 2  is 0.2. Given  that a student has  failed  in Paper 2,  the probability of failing in Paper 1 is 0.6. The probability of a student failing in both the papers is

1.  0.5

2.  0.18

3.  0.12

4.  0.06

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4
Correct Answer :

0.12


Explanation :
No Explanation available for this question

The solution of the differential equation k2(d2y/dx2) = y - y2 under the boundary conditions (i) y = yl  at x = 0 and (ii) y = y2 at x = ∞, where k, y1 and y2 are constants, is

1.  y = (y1 - y2) exp(-x/k2) + y2

2.  y = (y2 - y1) exp(-x/k) + y1

3.  y = (y1 - y2) sin h(x/k) + y1

4.  y = (y1 - y2) exp(-x/k) + y2

View Answer  
4
Correct Answer :

y = (y1 - y2) exp(-x/k) + y2


Explanation :
No Explanation available for this question

The equation x3 - x2 + 4x - 4 = 0 is to be solved using the Newton-Raphson method. If x =2  is  taken as  the  initial approximation of  the  solution,  then  the next approximation using this method will be

1.  2/3

2.   4/3

3.  1

4.   3/2

View Answer  
4
Correct Answer :

 4/3


Explanation :
No Explanation available for this question

Three functions f1(t), f2(t) and f3(t), which are zero outside the interval [0, T] are shown in the figure. Which of the following statements is correct

1.  f1(t) and f2(t) are orthogonal

2.  f1(t) and f3(t) are orthogonal

3.  f2(t) and f3(t) are orthogonal

4.  f1(t) and f2(t) are orthonormal

View Answer  
4
Correct Answer :

f1(t) and f3(t) are orthogonal


Explanation :
No Explanation available for this question

If  the semi-circular contour D of  radius 2  is as shown  in  the  figure,  then  the value of  the Integral 

1.  j π

2.  -j π 

3.  - π

4.  π

View Answer  
4
Correct Answer :

j π


Explanation :
No Explanation available for this question

Two series  resonant  filters are as shown  in  the  figure. Let  the 3-dB bandwidth of Filter 1 be B1 and that of Filter 2 be B2. The value of (B1/B2) is

1.  4

2.  1

3.  1/2

4.  1/4

View Answer  
4
Correct Answer :

1/4


Explanation :
No Explanation available for this question
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