Reference no: EM131536518

Questions: Answer the following multiple choice questions.

Q1. The discrete time function defined as u(n) = n for n ≥ 0; = 0 for n < 0 is an:

a) Unit sample signal
b) Unit step signal
c) Unit ramp signal
d) None of the mentioned

Q2. The signal given by the equation

 ∞
∑ |x(n)|²
 -∞
is known as:

a) Energy signal
b) Power signal
c) Work done signal
d) None of the mentioned

Q3. A real valued signal x(n) is called as anti-symmetric if:

a) x(n) = x(-n)
b) x(n) = -x(-n)
c) x(n) = -x(n)
d) None of the mentioned

Q4. Time scaling operation is also known as:

a) Down-sampling
b) Up-sampling
c) Sampling
d) None of the mentioned

Q5. The function given by the equation x(n)=1, for n=0;=0, for n≠0 is a:

a) Step function
b) Ramp function
c) Triangular function
d) Impulse function

Q6. If x(n) is a discrete-time signal, then the value of x(n) at non integer value of ‘n' is:

a) Zero
b) Positive
c) Negative
d) Not defined

Q7. The phase function of a discrete time signal x(n)=aⁿ, where a = r.e^jθ is:

a) tan(nθ)
b) nθ
c) tan^-1(nθ)
d) None of the mentioned

Q8. x(n)*δ(n-k)=?

a) x(n)
b) x(k)
c) x(k)*δ(n-k)
d) x(k)*δ(k)

Q9. The odd part of a signal x(t) is:

a) x(t)+x(-t)
b) x(t)-x(-t)
c) (1/2)*(x(t)+x(-t))
d) (1/2)*(x(t)-x(-t))

Q10. What is the condition for a signal x(n) = Brⁿ where r = e^αT to be called as an decaying exponential signal?

a) 0<r<∞
b) 0<r<1
c) r>1
d) r<0