# Consider the two systems The invertible system is

1.  S1

2.  S2

3.  Both S1 and S2

4.  None of these.

4

S2

Explanation :
No Explanation available for this question

# The amplitude and phase spectra for the harmonics of a periodic signal of time period shown in the figure below are

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# In the Fourier series expansion of a periodic function,

1.  Even functions have only a constant and cosine terms in their FS expansion

2.  Odd functions have only sine terms in their FS expansion

3.  Function with half-wave symmetry contain only odd harmonics

4.  All the above.

4

All the above.

Explanation :
No Explanation available for this question

# The average value of the delayed full-wave rectified sine wave as shown in the figure, is

1.

2.

3.

4.

4 Explanation :
No Explanation available for this question

# If f(t)=-f(-t) and f(t) satisfy the Dirichlet’ s conditions, then f(t) can be expanded in a Fourier series containing

1.  Only sine terms

2.  Only cosine terms

3.  Cosine terms and a constant term

4.  Sine terms and a constant term.

4

Only sine terms

Explanation :
No Explanation available for this question

# A periodic triangular wave is shown in the figure. Its Fourier components will consists only of

1.  All cosine terms

2.  All sine terms

3.  Odd cosine terms

4.  Odd sine terms.

4

All sine terms

Explanation :
No Explanation available for this question

# A linear system has the transfer function When it is subjected to an input white noise process with a constant spectral density A, the spectral density of the output will be

1.

2.

3.

4.

4 Explanation :
No Explanation available for this question

# The period of the function is

1.

2.  8 s

3.  4 s

4.

4

8 s

Explanation :
No Explanation available for this question

# The Fourier series representation of a periodic current is The effective value of the current is

1.

2.  8A

3.  6A

4.  2A.

4

8A

Explanation :
No Explanation available for this question

# For even function, the necessary condition is

1.  f(t)=-f(-t)

2.  f(t)=+f(-t)

3.  f(t)=1/f(-t)

4.  f(t) =-(t±T/2).

4