Code: A-06/C-04/T-04
Subject: SIGNALS & SYSTEMS
Time: 3 Hours
Max. Marks: 100
NOTE: There are 11 Questions in all.  
  • Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
  • Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.
  • Any required data not explicitly given, may be suitably assumed and stated.
Q1.
Choose the correct or best alternative in the following: (2x8)
a.
The discrete-time signal x (n) = (-1)n is periodic with fundamental period  
(A) 6 (B) 4  
(C) 2 (D) 0  
b
The frequency of a continuous time signal x (t) changes on transformation from x (t) to x ( t), > 0 by a factor
  
(A) . (B) .  
(C) 2 (D)  
c
A useful property of the unit impulse is that  
(A) (B)   
(C) (D)  
d
The continuous time version of the unit impulse is defined by the pair of relations  
(A) (B)  
(C) (D)  
e
Two sequences x1 (n) and x2 (n) are related by x2 (n) = x1 (- n). In the z-domain, their ROC's are  
(A) the same. (B) reciprocal of each other.  
(C) negative of each other. (D) complements of each other.  
f
The autocorrelation of the signal where is uniformly distributed over [ 0, 2 ] is  
(A) zero. (B)  
(C) (D)  
1
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