# Electronics and Communication Engineering - Signals and Systems

Exercise : Signals and Systems - Section 1

- Signals and Systems - Section 1
- Signals and Systems - Section 2
- Signals and Systems - Section 3
- Signals and Systems - Section 4
- Signals and Systems - Section 5
- Signals and Systems - Section 6
- Signals and Systems - Section 7
- Signals and Systems - Section 8
- Signals and Systems - Section 9
- Signals and Systems - Section 10

31.

A signal

If Fourier transform of

*m*(*t*) is multiplied by a sinusoidal waveform of frequency*f*_{c}such that*v*(*t*)=*m*(*t*) cos 2p*f*_{c}*t*If Fourier transform of

*m*(*t*) is M(*f*), Fourier transform of*v*(*t*) will beAnswer: Option

Explanation:

It is a modulation process. The resultant has (*f* + *f** _{c}*) and (

*f*-

*f*

*) terms.*

_{c}32.

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

Answer: Option

Explanation:

I_{C} = V(*j*ωC).

33.

**Assertion (A):** If , the initial value of *i*(*t*) is 5A

**Reason (R):** As per initial vaue theroem

Answer: Option

Explanation:

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

34.

δ(

*t*) is aAnswer: Option

Explanation:

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

.

35.

The analog signal given below is sampled by 600 samples per second for

*m*(*t*) = 3 sin 500 p*t*+ 2 sin 700 p*t*then folding frequency isAnswer: Option

Explanation:

.

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