Signals and Systems - Section 1 (3)

Directions to Solve

Signals and Systems - Section 1

17.

δ(t) is a

A.	energy signal
B.	power signal
C.	neither energy nor power
D.	none

Answer: Option B

Explanation:

Because Unit step is a Power signal. So By trignometric identifies d(t) also power.

31-237

18.

Assertion (A): If 25-425 , the initial value of i(t) is 5A

Reason (R): As per initial vaue theroem

25-425-1

A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true

Answer: Option A

Explanation:

Initial value theorem when applied to I(s) gives 5 A.

19.

A voltage wave having 5% fifth harmonic content is applied to a series RC circuit. The percentage fifth harmonic content in the current wave will be

A.	5%
B.	more than 5%
C.	less than 5%
D.	equal or more than 5%

Answer: Option B

Explanation:

I_C = V(jωC).

20.

A signal m(t) is multiplied by a sinusoidal waveform of frequency f_c such that
v(t)=m(t) cos 2pf_ct
If Fourier transform of m(t) is M(f), Fourier transform of v(t) will be