# Electronics and Communication Engineering - Signals and Systems

### Exercise :: Signals and Systems - Section 1

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

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

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

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

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