11) If the response of a system to an input does not depend on the future values of the input.Then which one of the following is true for the system ?
a) it is aperiodic
b) it is causal
c) it is anticipator
d) it is discrete
12) The lengths of two discrete time sequence x1(n) and x2(n) are 5 and 7, respectively. What is the maximum length of a sequence x1(n)*x2(n) ?
a)5
b) 6
c) 7
d) 11
13) What does the transfer function of a system describe for the system ?
a) Only zero-input response
b) Only zero-state response
c) Both zero-input and zero-state response
d) Neither zero-input response nor zero-state response
14) Laplace transforms of f(t) and g(t) are F(s) and G(s), respectively. Which one of the following expressions gives the inverse Laplace transform of F(s) G(s) ?
a) f(t) g(t)
b) f(t) /g(t)
c) f(t) + g(t)
d) f(t) *g(t)
15)Which one of the following is the correct statement ?
The system characterized by the equation y(t) = ax(t) + b is
a)linear for any value of b
b) linear if b > 0
c) linear if b < 0
d) non-linear
16) Which one of the following systems described by the following input-output relations is non-linear ?
a) y(n) = n x(2n)
b) y(n) = x (n2)
c) y(n) = n2x(n)
d) y(n) = x2(n)
17) Which one of the following is correct ? A system can be completely described by a transfer function if it is
a) non-linear and continuous
b) linear and time-varying
c) non-linear and time-invariant
d)linear and time invariant
18)Which one of the following is correct ? Energy of a power signal is
a) finite
b) zero
c) infinite
d) between 1 and 2
19)Convolution of two sequences X1 Z[n] and X2 [n] is represented as
a) X1(z)* X2(z)
b) X1(z) X2 (z)
c) X1 (z) + X2(z)
d) X1(z)/X2(z)
20) A function of one more variables which conveys information on the nature of physical phenomenon is called
a) Noise
b) Interference
c) System
d) Signal
Thank You!!