1. Pick the best test signal for any system

(a) Impulse  (b) unit step  (c)ramp  (d) all of these.

2. Find the even component of the signal x(t)=cost+sint+costsint+sin2t+cos3t

Cost+cos³t+costsint (b)sint+sin²t  (c) cost+sin²t  (d)cost+sin²t+cos³t

3. Trace the odd component of unit step signal

4. Find the period of the signal x(t)=cos4t+sin6t

(a) ∏  (b) ∏/2  (c)2∏  (d) none of these 

5. A system with response y(n)=nx²(n) is

(a) non linear  (b) time invariant  (c) causal  (d) all of these

6. Discrete impulse function can also be represented as

(a) u(n)+u(n-1) (b) u(n)-u(n-1)  (c) u(n)-u(n+1) (d) u(n)+u(n-1)

7. A signal x(t)=sint is given to a invertible system then the response is

(a)1/sint  (b)cost  (c)sint  (d)-sint

8. A system y(t)= 6x(t)+8x(t-7) is

(a) dynamic  (b)static  (c)causal  (d)both a&c

 9. The value equal to δ(-12t)=

(a)1/12δ(t )  (b)-1/12δ(t)  (c)δ(t)  (d)12δ(t)

10. Find the power of a signal x(t)=cos2t

(a) 1 (b)0 (c)1/2 (d)2

11. x(n)=u(n) is

(a)1  (b) infinite  (c) not periodic  (d) o

12. Energy of the signal Aδ(n) is

(a)A²/2  (b) 0  (c)A²  (d) NONE

13. The signal u(t) is

(a) strictly energy  (b)power signal  (c) neither energy nor power signal  (d)none

14. The period of a signal x(t)=2sin2t-2cos√2t is

(a) 2  (b) ½  (c) not periodic  (d)1/√2

15. The period of the signal cos πn/3+sin πn/2

(a) 4 (b)3 (c)12 (d)24