Pick the best test signal for any system find the even

Question

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