Electronics and Communication Engineering - Signals and Systems

41. 

A signal g(t) = A then g(t) is a

A. energy signal
B. power signal
C. neither energy nor power signal
D. insufficient data

Answer: Option B

Explanation:

.


42. 

The Fourier series of an odd periodic function contains

A. odd harmonics only
B. even harmonics only
C. cosine harmonics only
D. sine harmonics only

Answer: Option D

Explanation:

For an odd function f(- x) = - f(x) Hence, only sine terms.


43. 

If , the terms in f(t) will have

A. e-t and e-2t
B. et and e2t
C. te-t and te-2t
D. none of the above

Answer: Option A

Explanation:

(s + 1) term will give e-t and (s + 2) term will give e-2t .


44. 

An impulse function consist of

A. pure dc
B. pure a.c
C. entire frequency range with constant phase
D. infinite bandwidth with linear phase vaariations

Answer: Option C

Explanation:

Because F.T. of δ(t) = 1, 1 is a Constant function ranging from -∞ to +∞.


45. 

As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes

A. division by s in the s domain
B. division by e-sT in the s domain
C. multiplication by s in the s domain
D. multiplication by e-sT in the s domain

Answer: Option D

Explanation:

£f(t - T) = e-st F(s).