Computer Fundamentals and Digital Principles, Semester 1(2021-24), Model examination, June 2022

 

SAINTGITS COLLEGE OF APPLIED SCIENCES

          PATHAMUTTOM, KOTTAYAM

 

Model Examination, JUNE / JULY 2022

PG Department of Computer Applications and Artificial Intelligence, SemesterI

(Computer Fundamentals and Digital Principles)

Total : 80 marks                                                                    Time: 3 hours

Section A

Answer any 6 questions. Each question carries 3 marks.

(Write in not less than a paragraph)

1. RAM stands for Random access memory and is a computers’ short-term memory. Random-access memory is a computers’ short-term memory that can be read and changed in any order, typically used to store working data and machine code.

2. Bar code reader emits a beam of light (laser beam) that is reflected by the bar code image. A light-sensitive detector identifies bar code image by recognizing special bars at both ends. These special bars tell whether bar code has been read right-side up or upside down by reader. After detector identifies the bar code, it converts individual bar patterns into numeric digits—code the computer can understand. The reader then feeds the data into the computer.

3. Two reasons for popularity of DOS are its size & simplicity

4. Star topology is probably the most common topology because in a star topology, a broken connection between a node and the hub does not affect rest of the network

5. TCP:  Transmission Control Protocol ensures reliable data delivery and is meant to be used with IP (Internet Protocol), and the two protocols are often referenced together as TCP/IP.

6.  Define Number System?

Ans: Different ways of representing numbers

7. Perform BCD addition a. 1000+0001 b. 0101+0110

Ans: a.1001 b.00010001

8. Perform 1’s complement subtraction a. 0101-0010

Ans: 0011

9.  What is De-Morgan’s Theorem?

Ans: DeMorgan's first theorem states that two (or more) variables NOR´ed together is the same as the two variables inverted (Complement) and AND´ed, while the second theorem states that two (or more) variables NAND´ed together is the same as the two terms inverted (Complement) and OR´ed.

10. Convert to SOP π(2,4,5,7)?

Ans: ∑(0,1,3,6)

11. With the help of a block diagram define sequential circuit?

The sequential circuit is a special type of circuit that has a series of inputs and outputs. The outputs of the sequential circuits depend on both the combination of present inputs and previous outputs. The previous output is treated as the present state.

12. Write short note on shift registers?

Shift Register is a group of flip flops used to store multiple bits of data. The bits stored in such registers can be made to move within the registers and in/out of the registers by applying clock pulses

 

 

                                                                                                            (6 x 3 = 18 Marks)

Section B

Answer any 4 questions. Each question carries 8 marks.

(Write in not less than 2 pages)

 

13. The six primary types of computers used for Individual use are:

1. Desktop computers
2. Workstations
3. Notebook computers
4. Tablet computers
5. Handheld computers
6. Smart phones

14.  The main differences between Impact and non-impact printers are:

Impact Printers:

•      Impact printers involve mechanical components for conducting printing

•      It works by direct contact of ink ribbon with paper

•      Are typically loud

•      Has mechanisms resembling those of a typewriter

Non-Impact Printers:

•      No mechanical moving component is used

•      It does not hit or impact a ribbon to print

•      They use laser, xerographic, electrostatic, chemical & inkjet technologies

•      Are generally much quieter

•      Are less likely to need maintenance or repairs than earlier impact printers

15. Functions of an Operating System are:

·         Memory management

·         Processor management

·         Device management

16. The Uses of a Network

•      Simultaneous Access

•      Shared Peripheral Devices

•      Personal Communication

•      Easier Data Backup

17. Explain different representation of numbers in memory?

Binary Number System

                                               Base 2. Digits used : 0, 1         

Octal Number System

                                               Base 8. Digits used : 0 to 7     

HexaDecimal Number System

                                               Base-16 Digits used : 0 to 15 and A to F

18. Explain clocked RS- Flip Flop with neat diagram?

 

19.  What is an encoder? Draw logic diagram for encoder?

An Encoder is a combinational circuit that performs the reverse operation of Decoder.It has maximum of 2^n input lines and ‘n’ output lines, hence it encodes the information from 2^n inputs into an n-bit code. It will produce a binary code equivalent to the input, which is active High. Therefore, the encoder encodes 2^n input lines with ‘n’ bits.

The Truth table of 4 to 2 encoder is as follows :

 

20.  Convert to decimal  

a.(10.101)₂ b. (1025)₈    c. (ABD)₁₆ d. (111110)₂ e. (123EF)₁₆

a. 2.625 b. 533 c. 2749 d. 62 e. 74735

21. Simplify using K-map and draw logic diagram using universal gates

a.     F(w,x,y,z)=∑(0,1,2,4,5,6,8,,9,12,13,14)

Draw K-Map and Simplify it.

 

            (4 x 8 = 32 Marks)

 

Section C

Answer up to 3 questions carrying 15 marks each. However, total marks for this section should not exceed 30 marks. Marks scored over 30 will be ignored

 

22.  Most commonly used input devices are the keyboard & mouse

·         Keyboards: One of the 1^st peripherals to be used with computers is the Keyboard. Still is the primary input device for entering text & numbers. A standard keyboard includes about 100 keys - each key sends a different signal to CPU. Keyboards come in many styles. Various models differ in size, shape & feel except for few special-purpose keys, most keyboards are laid out almost identically

•      Mouse: A mouse is an input device that you can move around on a flat surface & controls the pointer. The mouse pointer is an on-screen object, usually an arrow. Is used to select text; access menus; & interact with programs, files, or data that appear on screen. Two types of mouse are there which are, the mechanical mouse and the optical mouse.

23. How the internet works

•      The internet is a worldwide computer network that transmits a variety of data and media across interconnected devices

•      It works by using a packet routing network that follows Internet Protocol (IP) and Transport Control Protocol (TCP)

•      TCP and IP work together to ensure that data transmission across the internet is consistent and reliable, no matter which device you’re using or where you’re using it.

•      When data is transferred over the internet, it’s delivered in messages and packets

•      Data sent over the internet is called a message, but before messages get sent, they’re broken up into tinier parts called packets.

•      These messages and packets travel from one source to the next using Internet Protocol (IP) and Transport Control Protocol (TCP)

•      IP is a system of rules that govern how information is sent from one computer to another computer over an internet connection

•      Using a numerical address (IP Address) the IP system receives further instructions on how the data should be transferred

•      Transport Control Protocol (TCP) works with IP to ensure transfer of data is dependable & reliable

•      This helps to make sure that no packets are lost, packets are reassembled in proper sequence, and there’s no delay negatively affecting the data quality

24.  Briefly explain even parity generator and checker?

 

25. Explain any two combinational circuit with the help of neat diagram?

Any two combinational circuit- (Decoder, Encode, Half adder, full adder, Multiplexer, De-Multiplexer)

                                                                                                

            (Maximum 30 Marks)

 

 

 

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