7/24/2019 Act Assignment III

1/3

ACT assignment

Assignment-III

Q.1 Draw the block diagram of an electronic communication system and exlain the

function of each block.

Q.! De"ne signal. Describe the di#erence between analog$ digital and discrete- time

signal.

Q.%De"ne energy and ower signal.

Q.& calculate the energy signal u't() 2e-3 t $ t*+ and u't()+ elsewhe

Q., Calculate the ower of the signal 't()!sin+.,t.

Q./0hat is the 23 ower of a sinusoidal signal of amlitude A4

Q.5 Is 6't()Acos'wt7+., an een signal 4

Q.8 Describe all the continuous time signal roerties

Q.9 Does Dirichlet:s condition re;uire a signal to be absolutely integrable 4

Q.1+ In ?!

'( 3't() A$ constant

Q.1& 3how that amlitude sectral density of g't( is @B'f-f+(7B'f7fo$where

g't()coswot

7/24/2019 Act Assignment III

2/3

Q.1,De"ne the modulation theorem using fourier Transform concet show its

sectrum.

Q.1/ 3how that 'i( eg't( @EF'f(7 FG'-f(H

'ii( Img g't( 1?!EF'f(- FG'-f(H

Q.15 6erify Jarseal:s theorem for signal f't() ebt

u (t)

Q.18 0hat is orthogonal set 4

Q.19 Is it a necessary re;uirement for orthogonality to hae =ero scalar roduct 4

Q.!+ robability can be de"ned as limiting alue of the relatie fre;uency of

occurrence$ Is it true4

Q.!1 Is Kayes theorem related to oint robability 4

Q.!! If A K are statistically indeendent$ then J'K?A( is same as which of 'A( and

J'K( 4

Q.!% 0hat is standard deiation 4

Q.!& De"ne modulation. 0hat is its need 4

Q.!, Derie A2 e;uation the ower related in A.2.

Q.!/ 0hat is bandwidth of D3K-3C and 33K-3C for modulating signal of , LM= 4

Q.!5 An A.2. signal is reresented in time-domain as 3't()!+E17+.9cos

2 10000 cos!N1++++++t$ the signal is radiated into free sace using an

antenna haing resistance of ,O. 3ketch the sectrum of the A.2. signal and

calculate the bandwidth$ ower and modulation ePciency.

Q.!8 An A2 signal is reresented in time domain as 3't() &cos18++t 7 1+

cos!+++t 7&cos!!++t. 3ketch the sectrum calculate the bandwidth$ ower

and modulation ePciency.

Q.!9.Describe all the generation methods of A2 signal.

Q.%+ 0rite short note on the followings

'i(s;uare law demodulator

'ii(neloe detector

'iii(synchronous detector

7/24/2019 Act Assignment III

3/3