BCA 3040– DATA COMMUNICATION

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Assignment

PROGRAM	BCA(REVISED FALL 2012)
SEMESTER	3
SUBJECT CODE & NAME	BCA 3040– DATA COMMUNICATION
CREDIT	4
BK ID	B1644
MAX.MARKS	60

Q.1 Draw the block diagram of communication system and briefly explain each block.

Answer: Communication is a process to exchange your ideas between two objects. There are number of factors used in block diagram are Transmitter, Encoder, Noisy Channel, Decoder etc

Transmitter: Transmitter is the first component in this block diagram. Using this system we can generate the messages which are to be sent through this system.

Encoder: Encoder is the second element in the communication system. It performs the encoding of the given data, which means that this system converts the messages in the form of  symbols for transmission purpose. In this system, a sequence of characters are created in a special format for an effective transmission. This encoding system is used fo

Q2. Briefly explain the communication channel with an example.

Answer: A medium through which a message is transmitted to its intended audience, such as print media or broadcast (electronic) media.

Communication Channels: In an organization, information flows forward, backwards and sideways. This flow of information is called communication. Communication channels refer to the way this information flows within the organization.

In this web known as communication, a manager

Q3. What is modulation? Explain why modulation is required.

Answer: Modulation is the addition of information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform -- constant height (amplitude) and frequency. Information can be added to the carrier by varying its amplitude, frequency, phase, polarization (for optical signals), and even quantum-level phenomena like spin. Modulation is usually applied to electromagnetic signals -- radio, lasers/optics and computer networks. Modulation can even be applied to direct current (which can be treated as a degenerate carrier wave with amplitude 0 and frequency 0) mainly by turning it on and off (as in Morse

Q4. What is Coaxial cable? Briefly explain the structure of Coaxial cable with a supported diagram.

Answer: Coaxial cables are the guided media that carnes the signal of higher frequency range compared to twisted pair cable. Coaxial cables are also called coax. (short form). Two types of coaxial cables are widely used: 50 ohm cable and 75 ohm cable. 50 ohm cable is used for digital transmission and 75 ohm cable is used for analog

Q5. Briefly explain Nyquist theorem with mathematical representation.

Answer : The Nyquist–Shannon sampling theorem, which has been named after Harry Nyquist and Claude Shannon, is a fundamental result in the field of information theory, in particular telecommunications and signal processing. Sampling is the process of converting a signal (for example, a function of continuous time or space) into a numeric sequence (a function of discrete time or space). Shannon's version of the theorem states:[1]

If a function x(t) contains no frequencies higher than B hertz, it is completely determined by giving its ordinates at a series of points spaced 1/(2B)

Q. 6 What are the advantages of packet switching over the circuit switching?

Answer:  TCP/IP networks route data between hosts in packets and packets and packets from many hosts are interspersed on a link, This is called packet switching.

Packet switching can be contrasted to circuit switching in which a circuit is exclusively dedicated to a session for its duration. The telephone network is a familiar example of circuit switching. A dedicated physical circuit is established between two points from the time a call begins until it ends.

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BCA3030-UNDERSTANDING PC & TROUBLE SHOOTING

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ASSIGNMENT

DRIVE	SUMMER 2015
PROGRAM	BCA(REVISED FALL 2012)
Semester	3
SUBJECT CODE & NAME	BCA3030-UNDERSTANDING PC & TROUBLE SHOOTING
CREDIT	4
BK ID	B 1416
MAX.MARKS	60

Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each question is followed by evaluation scheme.

1. What are processor modes? Explain the three types of processor modes.

Answer: Processor modes refer to the various ways that the processor creates an operating environment for itself. Specifically, the processor mode controls how the processor sees and manages the system memory and the tasks that use it. There are three different modes of operation, which resulted from the evolution of the PC from its humble beginnings with the Intel 8088 chip.

Real Mode: The original IBM PC could only address 1 MB of system memory, and the original versions of DOS created to work on it were designed with this in mind. DOS is by its nature a single-tasking operating system, meaning it can only handle one program running at a time. The decisions made in these early days have carried forward until

Q.2  List the different PCI signals along with their functions?

Answer : The PCI bus is the de-facto standard bus for current-generation personal computers. The mainadvantages for embedded applications like the STT are:

·         direct implementation in FPGAs (no data buffers or glue chips)

·         efficient protocol ("data burst" is the standard transfer)

·         ready availability of development hardware (

Q.3 Define the following.

a. Front Sided Bus

Answer: A front-side bus (FSB) was a computer communication interface (bus) often used in Intel-chip-based computers during the 1990s and 2000s. The competing EV6 bus served the same function for AMD CPUs. Both typically carry data between the central processing unit (CPU) and a memory controller hub, known as the Northbridge.

Depending on the implementation, some

Q4. What is POST? What are the various steps performed by the POST to check for resource availability.

Answer: A power-on self-test (POST) is a process performed by firmware or software routines immediately after a computer or other digital electronic device is powered on.

This article mainly deals with personal computers, but many other embedded systems such as those in major appliances, avionics, communications, or medical equipment also have self-test routines which are automatically invoked at power-on.

Q. 5 Discuss any five guidelines that we need to follow while troubleshooting the hardware problem.

Answer: The term troubleshooting refers to the act of applying diagnostic tools--often heuristically and accompanied by common sense--to determine the causes of system problems.

Each system problem must be treated on its own merits. It is not possible to provide a cookbook of actions that resolve each problem. However, this chapter provides some approaches and procedures, which used in combination with experience and common sense, can resolve many problems that might arise. Troubleshooting is a form of problem solving,

Q6. List the steps involved in installation of software in modem.

Answer: Make sure the modem can work with your service provider. While uncommon, sometimes you might run into an issue where the modem you purchased isn't compatible with the internet service available in your area.

Installation: Remove your old modem. Remember to uninstall any drivers associated with your old modem and reset your computer after doing so. Also, keep the cables since you might need them for your new modem.

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BCA3020 - Database Management System

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ASSIGNMENT

DRIVE	Summer  2015
PROGRAM	BCA (REVISED FALL 2012)
Semester	3
SUBJECT CODE & NAME	BCA3020 - Database Management System
CREDIT	4
BK ID	B 1479
MAX.MARKS	60

Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each question is followed by evaluation scheme.

Q. 1. Explain the functions of the following:

(a) Entities

Answer:(a) Entities

Answer: Functions, variables, named constants, special forms, and macros are described using a distinctive typographical format. Table 1-1 illustrates the manner in which Common Lisp functions are documented. The first line specifies the name of the function, the manner in which it accepts arguments, and the fact that it is a function. If the function takes many arguments, then the names of the arguments may spill across two or three lines. The

(b) Attributes

Answer: The keyword __attribute__ allows you to specify special attributes when making a declaration. This keyword is followed by an attribute specification inside double parentheses. The following attributes are

(c) Relationships

Answer: A function is a set of rules to wich you input a value and get an output. So, the set of rules could be a human body and its complex Chemistry or the program inside a hard drive. An equation is simply two things being equal in at least one aspect. For example 3x=9 whether is 9 apples in one side and 3 groups of pears in the other side or if they're all apples. This could occur with two variables as well, for instance y=x+3 if on one side you have a bag with 10 marbles and on the other a bag with 7 marbles and 3 loose. Yet that could

Q.2 Write the functions of the following

(a) Storage Manager

Answer: Storage Resource Monitor provides comprehensive storage performance monitoring and alerting across all your storage arrays to ensure peak performance and avoid capacity surprises.

Storage Manager is the interface to the systems storage service. The storage manager handles storage-related items such

(b) Buffer Manager

Answer: The role of the Buffer Manager is to make page from the disk available to processes into the main memory (buffer pool). It is the responsibility of the buffer manager to allow process to get the pages they need, while minimizing disk accesses and unsatisfiable requests. by implementing a page

Q.3 List and explain the important responsibilities of database manager.

Answer: A database manager (DB manager) is a computer program, or a set of computer programs, that provide basic database management functionalities including creation and maintenance of databases. Database managers have several capabilities including the ability to back up and restore, attach and detach, create, clone, delete and rename the databases. Database managers are used to manage local and remote databases. They discover

Q.4 Explain the Sequential File Organization with the help of diagrams.

Answer: A process-data diagram is a diagram that describes processes and data that act as output of these processes. On the left side the meta-process model can be viewed and on the right side the meta concept model can be viewed. A process-data diagram can be seen as combination of an business process model and data model.

The process-data diagram that is depicted at the right, gives an overview of all of these activities/processes and deliverables. The four gray

Q5. Explain basic operations of Relational algebra.

Answer : Relational database systems are expected to be equipped by a query language that can assist its user to query the database instances. This way its user empowers itself and can populate the results as required. There are two kinds of query languages, relational algebra and relational calculus. Relational

Q.6 What are the disadvantages of Data Distribution?

Answer: In a distributed database, data is stored in different systems across a network. For Example, in mainframes, personal computers, laptops, cell phones, etc. Array expressions specify concurrency but not   locality. That is, they specify opportunities for parallel execution   but not how these opportunities should be exploited so as to minimize communication costs on a parallel computer. HPF introduces data distribution directives to provide the programmer with control over locality. These directives work as follows. The   PROCESSORS directive is used to specify

Q.7 Write a note on the following

a) SUBSET Mapping

Answer: In DBMS Writing a Java application that stores data in a RDBMS can be as simple as slapping a few data-aware components on a form. However, if you rely on data-aware controls you lose the benefits of encapsulation and set yourself up for a larger maintenance burden ahead. (See the sidebar "Benefits of the Business Object"). Proper object-relational integration requires a strategy for mapping the object model to the relational model in order for Java objects to become persistent to the RDBMS. A persistent object is one that can

b) SUPERSET Mapping

Answer: A persistent class with a superset mapping contains attributes derived from columns of multiple tables. This type of mapping is also known as table spanning. Superset mappings are used to create "view classes" that hide the underlying data model, or to map a class inheritance tree to the database using a Vertical mapping

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BCA3010 -COMPUTER ORIENTED NUMERICAL METHODS

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SUMMER 2013, ASSIGNMENT

DRIVE	SUMMER 2015
PROGRAM	BACHELOR OF COMPUTER APPLICATION
SUBJECT CODE & NAME	BCA3010 -COMPUTER ORIENTED NUMERICAL METHODS
SEMESTER	THIRD
CREDITS	4
MAX. MARKS	60
BK ID	B

Answer all questions

Q. 1 Solve the system of equation by matrix inversion method

x +y +z = 1

x +2y + 3z = 6

x + 3y +4z = 6

Solution:-Write the given as a single matrix equation:

1         1  1         x              1

1     2   3         y    =       6

1     3    4        z              6

Q. 2. Find all eigen values and the corresponding eigen vectors of the matrix.

A = I 8  - 6     2 I

  I 6     7     4 I

  I 2     4     3 I

Q. 3. Find the cubic polynomial which takes the following values y(0) = 1, y(1) = 0, y(2) = 1 and y(3) = 10. Hence or otherwise, obtain y (0.5).

Solution: -

y = ax^3 + bx^2 = cx +d.

y(0) = 1 = 0+0+0+d, d = 1

y(1) = 0 = a+b+c+1, a+b+c = -1

y(2) = 1 = 8a + 4b + 2c + 1, 8a+4b + 2c = 0

y(3) = 10 = 27a + 9a + 3c + 1, 27a + 9a + 3c = 9 --à 9a + 3b + c

a + b +c = -1

8a + 4b + 2c = 0

9a + 3b + c = 3

Eq. 1: a – 9a + b – 3b + c – c = -1 -3

-8a -2a = -4

-4a –b = -2

4a +b = 2

Eq.2 : 2 -  2*eq.3: 8a – 18a +4b -6b +2c – 2c = 0-6

Q. 4. Find the approximate value of ò p/2,0 √ cos q dq by Simpson’s 1/3rd rule by dividing [0, p/2] into 6 equal parts.

Solution:- A method for approximating the value of a function near a known value. The method uses the tangent line at the known value of the function to approximate the function's graph. In this method Δx and Δy represent the changes in x and y for the function, and dx and dy represent the changes in x and y for the tangent line.

Q. 5. Use Picard’s method of successive approximations to find y1,y2, y3 to the solution of the initial value problem

Solution:-

Y ‘ = y

Q. 6.  Solve x y + y = 0, y  (1) = 0, y(2) = 1, h = 2/1

Answer : To solve an equation is to find what values (numbers, functions, sets, etc.) fulfill a condition stated in the form of an equation (two expressions related by equality). When searching a solution, one or more free variables are designated as unknowns. A solution is an assignment of expressions to the unknown variables that makes the equality in the equation true. In other words, a solution is an

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