DSP

What is the ROC of the signal x(n)=δ(n-k), k>0?

• z=0

• z=∞

• Entire z-plane, except at z=0

• Entire z-plane, except at z=∞

The power of a signal x[n] is defined as:

• $P=\lim_{N\rightarrow\infty\ }\ \frac{1}{1+2N}\sum_{n=-N}^N\left|x\left(n\right)\right|^2$

• $P=\lim_{N\rightarrow\infty}\ \frac{1}{1-2N}\sum_{n=-N}^N\left|x\left[n\right]\right|^2$

• $P=\lim_{N\rightarrow0}\ \frac{1}{1-2N}\sum_{n=-N}^N\left|x\left[n\right]\right|^2$

• $P=\lim_{N\rightarrow n}\ \frac{1}{2N+1}\sum_{-N}^N\left|x\left[n^2\right]\right|$

Find the Z-transform of x(n)={1,2,3,4,2}. consider x(0)=3

• Z²+2Z+3+4Z^-1+Z^-2

• Z²+4Z+3+2Z^-1+Z^-2

• Z²+2Z+3+4Z^-1+2Z^-2

• Z²+2Z+1+Z^-1+Z^-2

x(t)=cos(200Πt) what is the maximum frequency?

• 50Hz

• 100Hz

• 200Hz

• 400Hz

The given signal x(t)=sin(10∏t) is periodic. what is the period?

• 1/5 sec

• 5sec

• 10sec

• 1/10sec

What is the angular frequency and unit of f(t)=3sin(50t) ?

• 50 radian/sec

• 100 radian/sec

• 25 radian/sec

• None

The interface between an analog signal and a digital processor is

• D/A converter

• A/D converter

• Modulator

• Demodulator

Any physical phenomenon that carries some information is

• System

• Processor

• Signal

• None

The ROC of z-transform of any signal cannot contain poles.

• True

• False

What is the set of all values of z for which X(z) attains a finite value?

• a) Radius of convergence

• b) Radius of divergence

• c) Feasible solution

• d) None of the mentioned