EC6402 Important questions Communication Theory

EC6402 Important questions Communication Theory Regulation 2013 Anna University free download. Communication Theory Important questions free download.

Sample EC6402 Important questions:

1. What do you understand by narrowband FM?

When the modulation index is less than 1, the angle modulated systems are called low index. The bandwidth requirement of low index systems is approximately twice of the modulating.

2. Define frequency modulation.

Frequency modulation is defined as the process by which the frequency of the carrier wave is varied in accordance with the instantaneous amplitude of the modulating or message signal.

3. Define modulation index of frequency modulation.

It is defined as the ratio of maximum frequency deviation to the modulating
β = δ f f m

4. What do you meant by multitone modulation?

Modulation done for the message signal with more than one frequency component is called multitone modulation.

5. Define phase modulation.

Phase modulation is defined as the process of changing the phase of the carrier signal in
accordance with the instantaneous amplitude of the message signal.

6. What are the types of Frequency Modulation?

Based on the modulation index FM can be divided into types. They are Narrow band FM and Wide band FM. If the modulation index is greater than one then it is wide band FM and if the modulation index is less than one then it is Narrow band FM

7. What is the basic difference between an AM signal and a narrowband FM signal?

In the case of sinusoidal modulation, the basic difference between an AM signal and a narrowband FM signal is that the algebraic sign of the lower side frequency in the narrow band FM is reversed.

Subject Name	Communication Theory
Subject Code	EC6402
Regulation	2013

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EC6401 Important Questions Electronic Circuits 2

EC6401 Important Questions Electronic Circuits 2 Regulation 2013 Anna University free download. Electronic Circuits 2 Important Questions free download.

Sample EC6401 Important Questions:

1. List the four basic feedback topologies.

• Current series feedback.
• Current shunt feedback.
• Voltage series feedback
• Voltage shunt feedback

2. List the characteristics of an amplifier which are modified by negative feedback.

• It reduces the gain of an amplifier
• Increases the stability of an amplifier.
• It increases the bandwidth
• Decreases noise and distortion

3. What is Feedback Amplifier? & draw the diagram.

An amplifier with feedback network is known as feedback amplifier. With the help of feedback network, ‘a portion of the output signal is feedback to the input & combined with the input signal to produce the desired outputs’

4. What happens to the input resistance based on the type of feedback in an amplifier?[MAY/JUNE 2009]

If the feedback signal is added to the input in series with the applied voltage, it increases the input resistance.

If the feedback signal is added to the input in shunt with the applied voltage, it decreases the input resistance.

5. Why an LC tank circuit does not produce sustained oscillations. How can this can be overcome?[NOV/DEC 2008]

We know that the inductor coil has some resistance and dielectric material of the capacitor has some leakage.so small part of the originally imparted energy is used to overcome these losses. As a result, the amplitude of oscillating current goes on decreasing and becomes zero when all energy is
consumed as losses. So a LC tank circuit does not produce sustained oscillations. To maintain sustained oscillations, energy must be supplied to the circuit at the same rate at which it is dissipated. In an oscillator, the function of transistor and power supply source is to feed energy to the circuit to overcome the losses at right time.

 

Subject Name	Electronic Circuits 2
Subject Code	EC6401
Regulation	2013

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MA6451 Important Questions Probability and Random Processes

MA6451 Important Questions Probability and Random Processes regulation 2013 Anna University free download. Probability and Random Processes Important Questions free download.

Sample MA6451 Important Questions:

1. Discuss the pure birth process and hence obtain its probabilities, mean and
variance.

2. At the receiver of an AM radio, the received signal contains a cosine carrier
signal at the carrier frequency  with a random phase  that is uniform distributed
over ( 0,2). The received carrier signal is X (t) = A cos(t +  ). Show that the
process is second order stationary. Find out the 3rd step transition probability matrix. Determine the limiting probabilities.

3. Given a random variable  with density f () and another random variable 
uniformly distributed in (-, ) and independent of  and X (t) = a cos (t + ),
Prove that { X (t)} is a WSS Process.

4.A man either drives a car or catches a train to go to office each day. He never
goes 2 days in a row by train but if he drives one day, then the next day he is just
as likely to drive again as he is to travel by train. Now suppose that on the first
day of the week, the man tossed a fair die and drove to work iff a 6 appeared.
Find (1) the probability that he takes a train on the 3rd day. (2) the probability that
he drives to work in the long run.

5.Show that the process X (t) = A cost + B sin t (where A and B are random
variables) is wide sense stationary, if (1) E (A ) = E(B) = 0 (2) E(A2) = E (B2 ) and
E(AB) = 0.

6.Find probability distribution of Poisson process.

7.Prove that sum of two Poisson processes is again a Poisson process.

8.Write classifications of random processes with example.

Subject Name	Probability and Random Processes
Subject Code	MA6451
Regulation	2013

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EE6404 Important Questions Measurements and Instrumentation

EE6404 Important Questions Measurements and Instrumentation Regulation 2013 Anna University free download pdf.

Sample EE6404 Important Questions:

1. What is meant by measurement?
Measurement means an act or the result of comparison between the quantity and a predefined standard.

2. Mention the basic requirements of measurement.
The basic requirements of measurement are
i. The standard used for comparison purpose must be accurately defined and should be commonly accepted.
ii. The apparatus used and the method adopted must be provable.

3. State the two methods for measurement.
The two methods of measurement are
i. Direct method and

ii. Indirect method.

4. State the function of measurement system.

The measurement system consists of a transducing element which converts the quantity to be measured in an analogous form the analogous signal is then processed by some intermediate means and is then fed to the end device which presents the results of the measurement.

5. List the three types of instruments.
The three types of instruments are:

i. Mechanical Instruments

ii. Electrical Instruments and

iii. Electronic Instruments.

6. Classify the instrument based on their functions.
Instruments are classified into three types based on their functions. They are
i. Indicating instruments

ii. Integrating instruments

iii. Recording instruments

8. Why calibration of instrument is important?

The calibration of all instruments is important since it affords the opportunity to check the instrument against a known standard and subsequently to errors in accuracy.

9. List the calibration procedure.

Calibration procedure involves a comparison of the particular instrument with either. A primary standard A secondary standard with a higher accuracy than the instrument to be calibrated or An instrument of known accuracy.

10. Define: Calibration

Calibration is defined as the process by which comparing the instrument with a standard to correct the accuracy.

Subject Name	Measurements and Instrumentation
Subject Code	EE6404
Regulation	2013

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EE6403 Important Questions Discrete Time Systems and Signal Processing

EE6403 Important Questions Discrete Time Systems and Signal Processing Regulation 2013 Anna University free download.

 Sample EE6403 Important Questions:

1. Define Signal.

A Signal is defined as any physical quantity that varies with time, space or any other independent variables.

2. Define a system.

A System is a physical device (i.e., hardware) or algorithm (i.e., software) that performs an operation on the signal.

3. What are the steps involved in digital signal processing?

Converting the analog signal to digital signal, this is performed by A/D converter Processing Digital signal by digital system.
Converting the digital signal to analog signal, this is performed by D/A converter.

4. Give some applications of DSP?

Speech processing – Speech compression & decompression for voice
storage system
Communication – Elimination of noise by filtering and echo cancellation.
Bio-Medical – Spectrum analysis of ECG,EEG etc.

5. Write the classifications of DT Signals.

Energy & Power signals
Periodic & Aperiodic signals
Even & Odd signals.

6. What is an Energy and Power signal?

Energy signal: A finite energy signal is periodic sequence, which has a finite energy but zero average power.Power signal: An Infinite energy signal with finite average power is called a power signal.

7. What is Discrete Time Systems?

The function of discrete time systems is to process a given input sequence to generate output sequence. In practical discrete time systems, all signals are digital signals, and operations on such signals also lead to digital signals. Such discrete time systems are called digital filter.

8. Write the Various classifications of Discrete-Time systems.

Linear & Non linear system
Causal & Non Causal system
Stable & Un stable system
Static & Dynamic systems

9. Define Linear system

A system is said to be linear system if it satisfies Super position principle. Let us consider x1(n) & x2(n) be the two input sequences & y1(n) & y2(n) are the responses respectively, T[ax1(n) + bx2(n)] = a y1(n) + by2(n)

10. Define Static & Dynamic systems

When the output of the system depends only upon the present input sample, then it is called static system, otherwise if the system depends past values of input then it is called dynamic system.

Subject Name	Discrete Time Systems and Signal Processing
Subject Code	EE6403
Regulation	2013

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EE6402 Important Questions Transmission and Distribution 

EE6402 Important Questions Transmission and Distribution Regulation 2013 Anna University

Sample EE6402 Important Questions

1. Why all transmission and distribution systems are 3 phase systems?

A 3 phase a.c circuit using the same size conductors as the single phase circuit can carry three times the power which can be carried by a 1 phase circuit and uses 3 conductors for the 2 phases and one conductor for the neutral. Thus a 3 phase circuit is more economical than a 1 phase circuit in terms of initial cost as well as the losses. Therefore all transmission and distribution systems are 3 phase systems.

2. Why the transmission systems are mostly overhead systems?

Because of the cost consideration, the transmission systems are mostly overhead systems.

3. Why all overhead lines use ACSR conductors?

ACSR conductors comprises of hard drawn aluminium wires stranded around a core of single or multiple strand galvanized steel wire. They provides the necessary conductivity while the steel provides the necessary mechanical strength. Has less corona loss. The breaking load is high and has less weight.

4. Why transmission lines are 3 phase 3 wire circuits while distribution lines are 3 phase 4 wire circuits?

A Balanced 3 phase circuit does not require the neutral conductor, as the instantaneous sum of the 3 line currents are zero. Therefore the transmission lines and feeders are 3 phase 3 wire circuits. The distributors are 3 phase 4 wire circuits because a neutral wire is necessary to supply the 1 phase loads of domestic and commercial consumers.

5. Why overhead line conductors are invariably stranded?

They are stranded to make them flexible during erection and while in service.

6. State the advantages of interconnected systems.

Any area fed from one generating station during overload hours can be fed from another power station and thus reserved capacity required is reduced, reliability of supply is increased and efficiency is increased.

Subject Name	Transmission and Distribution
Subject Code	EE6402
Regulation	2013

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CS6456 important questions Object Oriented Programming

CS6456 important questions Object Oriented Programming Regulation 2013 Anna University

Sample CS6456 important questions:

1. What are the programming paradigms currently available?

2. What is object oriented paradigm?

3. What are the differences between structures and classes in C++?

4. Differentiate Object Oriented and Object Based Programming Languages.

5. What is Object Oriented Programming? How is it different from the Procedure Oriented Programming?

6. List any two drawbacks of procedure oriented languages.

7. What is meant by prototype based programming?

8. What is a Class? What is an Object? Give an example for each

9. Define encapsulation.

10. Compare inheritance and delegation with respect to Object Oriented Programming.

11. Which feature of object oriented programming provides (a) data hiding
(b) reusability?

12. Define (a) Object   (b) class

13. What is the use of scope resolution operator :: in C++?

14. Can you have a class named main in C++? If yes how do you call its constructor?

15. What is an abstract class?

16. What is Object Orients Programming? List any four OOP languages.

17. What is meant by function overloading?

18. What are conditional constructor and destructor?

19. What is nameless object?

20. Give a note on access specifiers

16 MARK important questions:

1. Describe the basic concepts of Object Oriented Programming and bring out the advantages of OOP.

2. Explain the declaration and defining a class in C++. How will you define the member functions of a class? Explain.

3. What is the need for parameterized constructors? Explain the function of constructors with their declaration and definition inside a class.

4. Illustrate the reserved word inline with two examples.

5. Explain the constructors and destructors.

6. explain the relation between (i)structured Programming(POP) and (ii)OOPs

7. Differentiate Object Oriented and Object based Languages.(8)

8. Explain copy constructor? Explain with a suitable example.

9. Differentiate Object Oriented and Object based Languages. Give examples for both.  List any 8 features of Oops. (Detailed explanation or examples are not required).

Subject Name	Object Oriented Programming
Subject Code	CS6456
Regulation	2013
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EE6401 Important Questions Electrical Machines 1

EE6401 Important Questions Electrical Machines 1 Regulation 2013 Anna University

Sample EE6401 Important Questions:

1. Mention the types of electrical machines.

There are three basic rotating machines types, namely
a. The dc machines
b. the poly phase synchronous machine (ac), and
c. Poly and single phase induction machine (ac)and a stationary machine,
namely Transformer

2. State Ohm’s law for magnetic circuit.

It states that the magneto motive force across the magnetic element is equal to the product of the magnetic flux through the magnetic element and the reluctance of the magnetic material. It is given by
MMF = Flux X Reluctance

3. Define leakage flux

The flux setup in the air paths around the magnetic material is known as leakage flux.

4. Define magnetic reluctance

The opposition offered by the magnetic circuit for the magnetic flux path is known as magnetic reluctance. It is analogous to electric resistance.

5. What is magnetostriction?

When ferromagnetic materials are subjected to magnetizing mmf, these may undergo small changes in dimension; this phenomenon is known as magnetostriction.

6. What is fringing?

In the air gap the magnetic flux fringes out into neighboring air paths due to the
reluctance of air gap which causes a non uniform flux density in the air gap of a
machine. This effect is called fringing effect.

7. State stacking factor.

The stacking factor is defined as the ratio of the net cross sectional area of a magnetic core to the gross cross sectional area of the magnetic core. Due to lamination net cross sectional are will be always less than gross cross sectional area. Therefore the value of stacking factor is always less than unity.

8.Mention some magnetic materials

Alnicos, chromium steels, copper–nickel alloy, nickel, cobalt, tungsten and aluminium.

Subject Name	Electrical Machines 1
Subject Code	EE6401
Regulation	2013
File detail	PDF of Important Questions

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ME6404 Important Questions THERMAL ENGINEERING

ME6404 Important Questions THERMAL ENGINEERING Important Questions Regulation 2013 Anna University free download pdf.

Sample ME6404 Important Questions:

1. What is meant by cut-off ratio?

2. Draw the P-V and T-S diagram for otto cycle.

3. What are the assumptions made for air standard cycle analysis?

4. Define mean effective pressure as applied to gas power cycles.

5. What is the effect of compression ratio on efficiency of otto cycle?

6. Draw the actual and theoretical P-V diagram for four stroke cycle SI engine.

7. Mention the various processes of dual cycle.

8. For the same compression ratio and heat supplied, state the order of decreasing air standard efficiency of Otto, diesel and dual cycle.

9. What are the effects of reheat cycle?

10. What is thermodynamic cycle?

11. What is a thermodynamic cycle?

12. What is meant by air standard cycle?

13. Name the various “gas power cycles”.

14. What are the assumptions made for air standard cycle analysis

15. Mention the various processes of the Otto cycle.

16. Mention the various processes of diesel cycle.

17. Mention the various processes of dual cycle.

18. Define air standard cycle efficiency.

19. Define mean effective pressure as applied to gas power cycles. How it is related to indicate power of an I.C engine.

20. Define the following terms. (i) Compression ratio (ii) Cut off ratio, (iii) Expansion ratio

21. Drive and expression for the air standard efficiency of Otto cycle in terms of volume ratio.

22. Drive an expression for the air standard efficiency of Diesel cycle.

23. Drive an expression for the air standard efficiency of Dual cycle.

24. Explain the working of 4 stroke cycle Diesel engine. Draw the theoretical and actual PV diagram.

25. Drive the expression for air standard efficiency of Brayton cycle in terms of pressure ratio.

Subject Name	THERMAL ENGINEERING
Subject code	ME6404
Regulation	2013

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GE6351 important questions ENVIRONMENTAL SCIENCE AND ENGINEERING

GE6351 important questions ENVIRONMENTAL SCIENCE AND ENGINEERING Regulation 2013 Anna University

Sample GE6351 important questions:

1. Define Environment.

The Physical, chemical and biological presence of living and non-living things outside an individual species is called
as its environment. According to ISO 14001, environment can be defined as, “Surroundings in which an
organization operates, including air, water, land, natural resources, flora, fauna, humans and inter relation”.

2. What are all the categories of environment?

The main categories of environment are biotic and abiotic environments. The abiotic environment can further be
classified into atmosphere (air), lithosphere (soil), and hydrosphere (water). The biotic environment is called as
biosphere.

3. Write the components of environment?

Air (Atmosphere)
Land (Lithosphere)
Water (Hydrosphere)
biosphere

4. Mention any two awareness programme of environmental issues to student?

• Participating in seminars and courses related to environment issues.
• Discussion with people about the environmental problems.

5. Define ecosystem.

Ecosystem has been defined as a system of interaction of organisms with their surroundings. Numerous dynamic
interactions are occurring with in an ecosystem and these are complex.

6. List any four characteristics of ecosystem.

(i). Ecosystem is the major ecological unit
(ii). It contains both biotic and abiotic components.
(iii). The boundary of the ecosystem is not rigidly defined and it is flexible.
(iv). Through the biotic and abiotic components nutrient cycle and energy flow occur.

7. What are the different types of ecosystem?

Natural Ecosystem
Artificial Ecosystem
Incomplete Ecosystem

8. What are the biotic components of an ecosystem?

a. Producers (Autotrophs)
b. Consumers (Heterotrophs)
c. Decomposers

9. What are the autotrophs?

Producers or Autotrophs are organisms that are capable of making their required food themselves. (Auto=self,
troph=feeder). Green plants, grasses, mosses, shrubs, etc., are some of the examples of autotrophic components.

Subject Name	ENVIRONMENTAL SCIENCE AND ENGINEERING
Subject code	GE6351
Regulation	2013

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