bt0068 smu bsc it spring 2017 (july/aug 2017 exam) IInd sem assignment

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DRIVE SPRING 2017

PROGRAM B.SC IT

SEMESTER SECOND

SUBJECT CODE & NAME BT0068, Computer Organization and Architecture

1. What is a digital computer? Explain using a diagram.

Answer: Digital computers use the binary number system, which has two digits: 0 and 1. A binary digit is called a bit. Information is represented in digital computers in groups of bits. By using various coding techniques, groups of bits can be made to represent not only binary numbers but also other discrete symbols, such as decimal digits or letters of the alphabet. By

2 Mention different types of buses. Give a brief explanation about each of them.

Answer: The CPU moves data around the computer on pathways that interconnect it to all the other components on the motherboard. These pathways are called 'buses'.

The internal bus carries data within

3 Using block diagram explain Von Neumann architecture.

Answer: The von Neumann Architecture is based on three key concepts:

1.      Data and instructions are stored in a single read-write memory.

2.      The content of this

4 What is a cache memory and on what principle it is based upon?

Answer: For all instruction cycles, the CPU accesses the memory at least once to fetch the instruction and sometimes again accesses memory to fetch the operands. The rate at which the CPU can execute instructions is limited by the memory cycle time. This limitation is due to the mismatch between the memory cycle

5 Write short notes on I/O modules.

Answer: It is the entity within a computer that is responsible for the control of one or more external devices and for the exchange of data between those devices and main memory and/or CPU. Thus I/O memory must have

� Interface to CPU

6 Using a block diagram explain DMA controller.

Answer: DMA has been a built-in feature of PC architecture since the introduction of the original IBM PC. PC-based DMA was used for floppy disk I/O in the original PC and for hard disk I/O in later versions. PC-based DMA technology, along with high-speed bus technology, is

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bca3050 smu bca spring 2017 (july/aug 2017 exam) IIIrd sem assignment

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PROGRAM - BCA(REVISED FALL 2012)

SEMESTER - 3

SUBJECT CODE & NAME

BCA 3050– Soft Skill - Personality Development

BK ID - B0726

CREDITS - 2

MAXIMUM MARKS – 30

Q1. Discuss the concept and applications of time management and explain recognizing the importance of time. [5+5] = 10

Ans: Concept and Applications of Time Management: Time management is a set of skills, tools, and systems that help you use your time to accomplish what you want in an efficient way. Time is often equated with money, and just as we often find ourselves short of cash, we also find ourselves with short of time. The various applications of Time

Q2. Explain personality. Name its different categories. [5+5] = 10

Ans: Personality – An Explanation: When we talk of personality, we don't mean a person who has charm, a positive attitude towards life, a smiling face, or who has won a beauty contest. When psychologists talk of personality, they mean a dynamic concept describing the growth and development of a person's whole psychological system. The word 'personality' has interesting etymological origins. It can be traced to the Latin word "

Q3. Discuss the Role and Functions of a good leader. [10]

Ans: Role & Functions of a Good Leader: The overall aim of a leader is to achieve the task with the help of his group. To meet the overall aim, the leader has three main objectives :

·         To gain the commitment and cooperation of his team

·         To get the group into action to achieve agreed objectives.

·         To make the best use of the skills, energies and talents of the team

Leadership is a complex process

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bca3040 smu bca spring 2017 (july/aug 2017 exam) IIIrd sem assignment

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PROGRAM - BCA(REVISED FALL 2012)

SEMESTER - 3

SUBJECT CODE & NAME

BCA 3040 – DATA COMMUNICATION

BK ID - B1644

CREDITS - 4

MAXIMUM MARKS – 60

Q1. What is Channelization? Briefly explain three channelization techniques. [2+8] = 10

Ans: Channelization: Channelization is a multiple-access method in which the available

bandwidth of a link is shared in time, frequency, or through code, between different stations. In this section, we discuss three channelization techniques: FDMA, TDMA, and CDMA.

1 Frequency-Division Multiple Access (FDMA): In frequency-division multiple access (FDMA), the available bandwidth is divided into frequency bands. Each station is allocated a band to send its data. In other

Q2. What is modulation? Explain why modulation is required? [5+5] = 10

Ans: Modulation: Modulation is the process of varying one of characteristics (either\

Q3. Write a note on: [5+5] 10

·         Ground Wave Propagation

·         Sky Wave Propagation

Ans: Ground Wave Propagation: Ground wave propagation follows the curvature of the Earth. Ground waves have carrier frequencies up to 2 MHz. AM radio is an example of ground wave propagation. Figure shows the concept of Ground wave propagation

Q4. Briefly explain Nyquist theorem with mathematical representation. [10]

Ans: Nyquist theorem: The Nyquist theorem states that “a signal must be sampled at least twice as fast as the bandwidth of the signal to accurately reconstruct the waveform” In other words, the sampling frequency should be at least twice the highest frequency contained in the signal. It is mathematically represented as

\

Q5. What is Communication System? Briefly explain the important elements of communication system. [4+6] = 10

Ans: Communication: Basically, communication is the process of conveying a message from one person to other or from one place to another place. It is the exchange of ideas, thoughts and feelings between two persons, places or points.

Communication Systems: Communication System is a system or facility capable of providing

information transfer between persons or equipments. The elements used in communication system make communication simpler and faster. The \

Q6. What are the advantages of packet switching over circuit switching? [10]

Ans: Packet switching: In packet switching message is divided into blocks of data called packets.

Each packet is associated with a header before they are transmitted individually through the network. The path taken by each packet to reach their respective destination is depending on the status of links used by switching equipment. The packet-switching network is a distributed

collection of packet-switching nodes. The long-haul \

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bca3030 smu bca spring 2017 (july/aug 2017 exam) IIIrd sem assignment

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PROGRAM - BCA(REVISED FALL 2012)

SEMESTER - 3

SUBJECT CODE & NAME

BCA3030 -UNDERSTANDING PC & TROUBLE SHOOTING

CREDIT - 4

BK ID - B1416

MAX. MARKS – 60

Q1. What is POST? What are the various steps performed by the POST to check for resource availability? [2+8] = 10

Ans: Power-On-Self-Test (POST): Power-On-Self-Test is a routine that is run to ensure that all the components and functions of the computer are working correctly to start the computer successfully. The POST only checks the

Q2. How do you to take decision on whether to replace or repair the Motherboard? Explain [10]

Ans: Take decision on whether to replace or repair the Motherboard: When any key component of the motherboard fails or shows problem in its working you will be faced with the question of either replacing that particular component with a spare or to change the whole motherboard and replace it with a new one. You might assume that it is comfortable to change the components and replace them. But when it comes to the availability of the spare parts it is difficult to find them when they come to the higher end processors. Therefore, it is always better to install

Q3. How do you rectify the BUS errors? List out points one should consider while connecting Bus to the various components. [4+6] =10

Ans: rectify the Bus errors:

·         You can use the multi-meter to check the voltage level in the Bus. Irrespective of low voltage or standard Bus you have to find the -12 volt dc and +5 volt dc. You should ensure that a low voltage Bus should have +3.3 Volt dc. Otherwise, you need to conclude that there is fault in the Bus and need to replace power supply.

·         You can adjust the CLOCK

Q4. Write the instructions one should follow while installing the new Motherboard. [10]

Ans: Installing the new motherboard: Now your system is ready for installing the new motherboard. A little effort is required to see that the motherboard fit inside the system and work properly. You must follow the instructions given below to place your motherboard inside the system. Place the motherboard gently inside the system and ensure

Q5. Discuss any five guidelines that we need to follow while troubleshooting the hardware problem. [10]

Ans: Troubleshooting: Usually USB problems are not severe. But still there are few steps which can control these small problems such as hardware failure, device driver’s configuration problems, cabling problems, firmware/BIOS problems, Root

Q6. How do you solve of problem if you don't hear anything from the sound card? [10]

Ans: Sound Card Problems:

No Sound: You could consider the following solutions if you don't hear anything from the sound card:

·         Ensure that the sound card is set in such a way that it uses all default resources, and that other devices using these

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bca3020 smu bca spring 2017 (july/aug 2017 exam) IIIrd sem assignment

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PROGRAM - BCA (Revised Fall 2012)

SEMESTER - 3

SUBJECT CODE & NAME

BCA3020 – Data Base Management System(DBMS)

CREDIT - 4

BK ID - B1479

MAX. MARKS – 60

Q1. List and explain the important responsibilities of database manager. [10]

Ans: Important responsibilities of database manager: important responsibilities of Database manager:

·         Interaction with file manager: The raw data is stored on the disk using the file system which is usually provided by a conventional operating system. The database manager translates the various DML statements into low-level file system commands. Thus the database manager is responsible for the actual

Q2. What is a table in relational data model? List the properties of relational tables. [10]

Ans: Relational Data Model: The relational model today, is the primary data model for commercial dataprocessing applications. It has attained its primary position because of its

simplicity, which eases the job of the programmer, as compared to earlier data models such as the network model or the

Q3. What is data independence? Briefly explain. [10]

Ans: Data Independence: Data independence is usually considered from two points of view: physical data independence and logical data independence. Physical data independence allows changes in the physical storage devices or organization of the files to be made without requiring changes in the conceptual view or any of the external views and hence in the application programs using the database. Thus, the files may migrate from one type of physical media to another or the file structure may change without any need for changes in

Q5. What is view? List its advantages. [4+6]= 10

Ans: Views: A view is a virtual table which does not actually exist. It is made up of a query on other tables in the database. It could include only certain columns or rows from a table or from many tables. A view which restricts the user to certain rows is called a horizontal view, and a vertical view restricts the user to certain columns. You are not restricted to purely horizontal or vertical slices of data. A view can be as complicated as you like. You can have grouped views,

where the query contains a GROUP BY clause. This makes the view a summary of the data in a table or tables. A view is a relation (virtual other than base) and can be used in query expressions, that is, queries can be written using

Q6. Write a note on the following: 5+5

a) SUBSET Mapping

b) SUPERSET Mapping

Ans: We can see that classes of OOP language can be mapped to RDBMS tables. For e.g. JAVA classes can be mapped to RDBMS tables. We can map a persistent class and a table in so many ways. The simplest mapping between a persistent class and a table is one-to-one. In this case, all attributes in the persistent class are represented by all columns of a table. Each instance of a business class is then stored in a row of the table.

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