IT1201 Signals & Systems B.E Question Bank : niceindia.com
Name of the College : Noorul Islam College of Engineering
University : Anna University
Degree : B.E
Department : Information Technology
Subject Code/Name : IT 1201 – Signals & Systems
Document Type : Question Bank
Website : niceindia.com
Download Model/Sample Question Paper :https://www.pdfquestion.in/uploads/niceindia.com/3038-IT1201_SIGNALS_AND_SYSTEMS__.pdf
NICE Signals & Systems Question Paper
Unit I Classification Of Signals And Systems :
1. Define Signal :
A signal is a function of one or more independent variables which contain some information.
Eg : Radio signal, TV signal, Telephone signal etc.
Related : Turbomachinery Institute of Technology &Sciences XCS352 Theory of Computation M.Sc Question Bank : www.pdfquestion.in/3142.html
2. Define System. :
A system is a set of elements or functional block that are connected together and produces an output in response to an input signal.
Eg : An audio amplifier, attenuator, TV set etc.
3. Define CT signals. :
Continuous time signals are defined for all values of time. It is also called as an analog signal and is represented by x(t).
Eg : AC waveform, ECG etc.
4. Define DT signal. :
Discrete time signals are defined at discrete instances of time. It is represented by x(n).
Eg : Amount deposited in a bank per month.
5. Give few examples for CT signals. :
AC waveform, ECG,Temperature recorded over an interval of time etc.
6. Give few examples of DT signals. :
Amount deposited in a bank per month,
7. Define unit step,ramp and delta functions for CT. :
Unit step function is defined as :
U(t)= 1 for t >= 0
0 otherwise
Unit ramp function is defined as :
r(t)=t for t>=0
0 for t<0
Unit delta function is defined as :
d(t)= 1 for t=0
0 otherwise
8. State the relation between step, ramp and delta functions(CT). :
The relation ship between unit step and unit delta function is d(t)= u(t)
The relationship between delta and unit ramp function is d(t).dt = r(t)
9. State the classification of CT signals. :
The CT signals are classified as follows
(i) Periodic and non periodic signals
(ii) Even and odd signals
(iii) Energy and power signals
(iv) Deterministic and random signals.
10. Define deterministic and random signals. :
A deterministic signal is one which can be completely represented by Mathematical equation at any time.In a deterministic signal there is no uncertainty with respect to its value at any time.
Eg : x(t)=coswt
x(n)=2pft
A random signal is one which cannot be represented by any mathematical equation.
Eg : Noise generated in electronic components, transmission channels, cables etc.
11. Define power and energy signals. :
The signal x(t) is said to be power signal, if and only if the normalized average power p is finite and non-zero.
Ie. 0<p<4
A signal x(t) is said to be energy signal if and only if the total normalized energy is finite and non-zero.
Ie. 0<E< 4
12. Compare power and energy signals. :
Power Signals :
Practical periodic signals are power signals
The normalized average power is finite and non-zero
Energy Signals :
Non-periodic signals are energy signals
Total normalized energy is finite and non- zero.
13.Define odd and even signal. :
A DT signal x(n) is said to be an even signal if x(-n)=x(n) and an odd signal if x(-n)=-x(n).
A CT signal is x(t) is said to be an even signal if x(t)=x(-t) and an odd signal if x(-t)=-x(t).
14. Define periodic and Aperiodic signals. :
A signal is said to be periodic signal if it repeats at equal intervals. Aperiodic signals do not repeat at regular intervals.
A CT signal which satisfies the equation x(t)=x(t+T0) is said to be periodic and a DT signal which satisfies the equation x(n)=x(n+N)is said to be periodic.
15. State the classification or characteristics of CT and DT systems. :
The DT and CT systems are according to their characteristics as follows
(i). Linear and Non-Linear systems
(ii). Time invariant and Time varying systems.
(iii). Causal and Non causal systems.
(iv). Stable and unstable systems.
(v). Static and dynamic systems.
(vi). Inverse systems.