In a baseband communications link, frequencies up to 3500 Hz are used for signaling using a raised cosine pulse with 75% excess bandwidth and for no inter-symbol interference,the maximum possible signaling rate in symbols per seconds is

1.  1750

2.  2625

3.  4000

4.  5250

View Answer  
4
Correct Answer :

4000


Explanation :
No Explanation available for this question

The power spectral density of a real process X(t) for positive frequencies is shown below the values of E[X2(t)] and [E[X(t)]], respectively are

1.  6000/π,0

2.  6400/π,0

3.  6400/π,20/(π√2)

4.  6000/π,20/(π√2)

View Answer  
4
Correct Answer :

6400/π,0


Explanation :
No Explanation available for this question

The current I through the base of a silicon npn transistor is 1+0.1cos(10000πt) mA. At 300k, the rπ in the small signal model of transistor is

1.  250

2.  27.5

3.  25 W

4.  22.5 W

View Answer  
4
Correct Answer :

25 W


Explanation :
No Explanation available for this question

T he source of a silicon (ni = 1010 per cm3) n-channel MOS transistor has an area of 1 sq μm and adepth of 1 μm. If the dopant density in the source is 1019/cm3, the number of holes in the source region with the above volume is approximatel

1.  107 

2.  100

3.  10

4.  0

View Answer  
4
Correct Answer :

0


Explanation :
No Explanation available for this question

A transmission line with a characteristic impedance of 100 Ω is used to match a 50 Ω section to a 200 Ω section. If the matching is to be done both at 429 MHz and 1 GHz, the length of the transmission line can be approximately  

1.  82.5 cm

2.  1.05 m 

3.  1.58 m 

4.  1.75 m

View Answer  
4
Correct Answer :

1.05 m 


Explanation :
No Explanation available for this question

T he feedback system shown below oscillates at 2 rad/s when  

1.  K = 2 and a = 0.75

2.  K = 3 and a = 0.75

3.  K = 4 and a = 0.5

4.  K = 2 and a = 0.5

View Answer  
4
Correct Answer :

K = 2 and a = 0.75


Explanation :
No Explanation available for this question

A  fair  coin  is  tossed  till  a  head  appears  for  the  first  time.  The  probability  that  the  number  of required tosses is odd, is 

1.   1/3  

2.  1/2

3.  2/3

4.  3/4

View Answer  
4
Correct Answer :

2/3


Explanation :
No Explanation available for this question

A BPSK scheme operating over an AWGN channel with noise power spectral density of N0/2 ,uses equiprobable signals  S1(t)=√2E/T sin(ωcθ)   S2(t)=-  - √2E/T sin(ωcθ)    over the symbol interval (0, T). If the local oscillator in a coherent receiver is ahead in phase by 450 with respect to the received signal, the probability of error in the resulting system is  

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

T he input x(t) and output y(t) of a system are related as   The system is

1.  time-invariant and stable 

2.  stable and not time-invariant

3.  time-invariant and not stable

4.  not time-invariant and not stable

View Answer  
4
Correct Answer :

stable and not time-invariant


Explanation :
No Explanation available for this question

T he Fourier transform of a signal h(t) is H( jw ) = (2cosw )(sin2w ) /w . The value of h(0) is

1.   ¼

2.  ½

3.  1

4.  2

View Answer  
4
Correct Answer :

1


Explanation :
No Explanation available for this question
Previous Next

Interview Questions

MongoDB
Java Script
Node JS
PHP
JQuery
Python