PYQ – COMPUTER ORGANIZATION & ARCHITECTURE (2418404) | SEMESTER 4TH (2ND YEAR) | Year 2020

Computer Organization & Architecture 2020 (OLD) PYQ.

Group A

Choose the most suitable answer from the following options: -   (1*20=20)

(i) Which of the following holds the information when the power supply is switched off?

(a) Static RAM

(b) Dynamic RAM

(c) EEPROM

(d) None of these

(ii) Cycle stealing technique is used in _____________

(a) Interrupt based data transfer

(b) Polled mode data transfer

(c) DMA based data transfer

(d) None of these

(iii) When CUP is not fully loaded, which of the following method of data transfer is preferred?

(a) DMA

(b) Interrupt

(c) Polling

(d) None of these

(iv) Floating point representation is used to store:

(a) Boolean values

(b) Whole numbers

(c) Real integers

(d) Integers

(v) In computer, subtraction is generally carried out by:

(a) 9’s complement

(b) 10’s complement

(c) 1’s complement

(d) 2’s complement

(vi) A ⊕ B ⊕ C is equal to A ⊙ B ⊙ C for: 

(a) A = 0, B = 1, C = 0

(b) A = 1, B = 0, C = 1

(c) A = 1, B = 1, C = 1

(d) All of the above

(vii) An instruction code is ____________

(a) An output of a program

(b) A group of bits that instruct the computer to perform specific operation

(c) The digital circuit that instruct the computer to perform specific operation

(d) None of these

(viii) The program counter (PC) holds the address of:

(a) The instruction is begun executed

(b) The next instruction to be read from memory

(c) The operands

(d) None of the above

(ix) A memory that is part of a control unit is known as:

(a) Internal memory

(b) External memory

(c) Command memory

(d) Control memory

 
(x) A group of eight bits is known as ___________

(a) Nibble

(b) A byte

(c) An octet

(d) both (b) and (c)

 
(xi) Virtual memory consists of:

(a) Static RAM

(b) Dynamic RAM

(c) Magnetic memory

(d) None of these

(xii) Which of the following memory is volatile?

(a) RAM

(b) CD

(c) ROM

(d) Hard Disk

(xiii) The register that holds the address of the stack is called:

(a) Information Counter

(b) Program Counter

(c) Stack Pointer

(d) Pointer of Pointer

(xiv) The instruction that does not need any address field is:

(a) Three address instruction

(b) Two address instruction

(c) One address instruction

(d) Zero address instruction

 
(xv) Which of the following is a measure of the performance of cache memory?

(a) Seek time

(b) Latency time

(c) Hit radio

(d) Baud rate

(xvi) How many 128 * 8 memory chips are needed to provide a memory capacity of 4096 * 16?

(a)  64

(b) 32

(c)  128

(d) None of these

(xvii) Booth’s algorithm is used for:

(a)  Division

(b) Multiplication

(c)  Subtraction

(d) Division and multiplication

(xviii) A _________ is issued to activate the peripheral and to inform it what do you.

(a)  Data input command

(b) Chip enable command

(c)  Initial instruction

(d) Control command

(xix) Don’t care condition occurs in which flip flop:

(a)  SR flip flop

(b) J – K flip flop

(c)  In both SR and JK flip flop

(d) None of these

(xx) In signal magnitude binary division, if the dividend is (11100)₂ and the division is (10011)₂ then the result is:

(a) (00100)₂

(b) (10100)₂

(c) (11001)₂

(d) (01100)₂

 

Group:-"B"

➥ Answer all Five Questions: -                         (5*4=20) 

 

2.  Write steps to multiply two negative numbers using booth algorithm.

OR

Write down the IEEE standards for floating point numbers.

 

3.  Explain how memory transfer take place in computer system?

OR

Write down the steps in fetching a word from memory.

 

4. Explain stack organization in computer memory. 

OR

Perform the arithmetic operations (+46) +(-23) and (-46) – (-23) in binary using signed 2’s complement representation for negative numbers.

 

5.  Write down steps in fetching a word from memory.

OR

What do you understand by interrupts? Also explain the different types of interrupts.

 

6. Explain decoders. Draw the block diagram of 2-to-4-line NAND gate. Also show its truth table.  

OR

What is ROM? How does PROM differ from EEPROM?

 

Group:- "C"

➥ Answer all Five Questions: -                         (5*6=30) 

 

7.  Draw a neat block diagram of a 4-bit adder-subtracter circuit. Explain its operation in details.

OR

What do you mean by addressing modes? Discuss different types of addressing mode with their merits and demerits.

 

8. What do you understand by hardwired control unit? Give various methods to design hardwired control unit. 

OR

Define the terms address space and memory space. An address space is specified by 24 bits and the corresponding memory space by 16 bits. Find the following:

a.      How many words are there in the address space?

b.      How many words are there in the memory space?

 

9.  Write short notes on any two of the following:

       i.          Auxiliary memory

     ii.          Memory hierarchy

    iii.          Virtual memory

    iv.          Cache memory

OR

10.  Explain the structure of a magnetic disk. Define the following terms:

         i.          Seek time

       ii.          Rotational time

     iii.          Average access time

OR

A virtual memory system has 16K word logical address space, 8K word physical address with page site of 2K words. The page address trace of a program has been found be:

7, 5, 3, 2, 1, 0, 4, 1, 6, 7, 4, 2, 0, 1, 3, 5

Note four pages residents in memory after each page reference change for each of the following replacement policies:

i.                 FIFO

ii.               LRU

 

11.  Describe the various basic components of memory management hardware together with their functions.

OR

What are the characteristics of a good instruction format? Explain the types of instructions format.

 

 

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