Computer organization and architecture previous year questions 2019

Sub Code: - 1618304

2019(ODD)

Time: 3Hrs                                                                          

Semester  III(New) 

 COA             

Full Marks: 70

Pass marks: 28

                                                                                                         

Group A

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

(i) Dynamic RAM consumes _________ power and _________ then the static RAM? 
(a) More, Faster
(b) More, Slower
(c) Less, Slower
(d) Less, Faster

(ii) Which flag of the 8085’s flag register is not accessible to programmer directly?
(a) Zero flag
(b) Carry flag
(c) Auxiliary carry flag
(d) Parity flag

(iii) Cache memory works on the principle of
(a) Locality of reference
(b) Locality of data
(c) Locality of memory
(d) Locality of reference and memory

(iv) Which memory holds the information when the power supply is switched off?
(a)Dynamic RAM
(b) Static RAM
(c) EEPROM
(d)  None of the above

(v) Which of the following interrupt is markable?
(a) INTR
(b) RST 7.5
(c) TRAP
(d) Both (a) and (b)

(vi) Cycle stealing technique is used in
(a) Interrupt bases data transfer
(b) DMA based data transfer
(c) Polled mode data transfer
(d) All of the above

(vii) Which of the following is not a characteristic of a RISC architecture
(a) Large Instruction Set
(b) One Instruction Per Cycle
(c) Simple Addressing Modes
(d) Register-to-Register Operation

(viii) Associative memory is some time called as-
(a) Content Addressable Memory
(b) Cache Memory
(c) Main Memory
(d) Virtual Memory

(ix) Floating point representation is used to store
(a) Integers
(b) Whole numbers
(c) Real numbers

(d) Boolean values                                 

(x)  What characteristic of RAM memory makes it not suitable for permanent storage?
(a) Too bulky
(b) Unreliable
(c) Too slow
(d) It is volatile

(xi) 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 the above

(xii) The program counter holds the address of
(a) Instruction is begin executed 
(b) The next instruction to be read from memory
(c) The operands
(d) None of these

(xiii) The function of the control unit in digital computer is
(a) To initiate sequence of micro operations
(b) To initiate the execution of a program
(c) To stop the execution of a program
(d) To shutdown the computer

(xiv) A memory that is the part of a Control unit is known as-
(a) Internal Memory
(b) External Memory
(c) Command memory
(d) Control memory

(xv) A group of eight bits is known as  
(a) Nibble
(b) A byte
(c) An octet
(d) Both (a) and (b)

(xvi) The tendency of a processor to access the same set of memory locations receptively over a short period of time is known as-
(a) Local effect
(b) Locality of reference 
(c) Frame of reference
(d) All of the above

(xvii) The CPU state is saved in the event of a transfer control-
(a) From one instruction to a non-sequential instruction of a program
(b) From our program to another
(c) During executing of an instruction due to an interrupt cycle
(d) None of the above statement is true

(xviii) A computer uses RAM chips of 1024 * 1 capacities. How many chips are needed to provide a memory capacity of 16k bytes.
(a) 16 
(b) 128
(c) 32
(d) None of the above

(xix) Booth’s algorithm is used for: 
(a) Division 
(b) Multiplication
(c) Subtraction
(d) Division and Multiplication

(xx) The instruction that does not need any address field:
(a) Three address instruction
(b) Two address instruction
(c) One address instruction
(d) Zero address instruction

Group:-"B"

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

2. Write steps to multiply two negative number using booth algorithms.

OR

Write down the IEEE standards for floating point numbers.

3. What is ROM? How does PROM differ from EEPROM?

OR

With the help of block diagram, discuss working of direct memory access (DMA)?

4. What are the advantages and disadvantages of hardware and micro programmed control?

OR

Define cache memory?

5. Define interrupt and discuss its type

OR

What do you mean by pipeline in computer organization?

6. Define addressing mode and its type.

OR

Explain the role of stack in programming?

Group:- "C"

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

7. Convert into binary

a)    (0.375)

b)    0.54545

c)     38.210

OR

Convert into decimal

a.     73

b.     125

c.      35

8. What is micro operation? List and briefly explain the most commonly encountered arithmetic operations

OR

What do you mean by Control unit? Describe briefly a hardware control unit. Also give its timing diagram

9. What do you mean by fetch cycle, instruction cycle, machine cycle, interrupt acknowledgement cycle?

OR

Discuss in brief (with their advantage and disadvantage)

a)    RISC

b)    CISC

10.  An instruction is stored at location 300 with its address field at location 301. The address field has value 400. A processor register R1 contains the number 200. Compute effective address if the addressing mode of the instruction is

a)    Direct

b)    Immediate

OR

Explain the need of memory hierarchy with the help of a block diagram? What a-is the reason for not having one large memory unit for storing all information al one place?

11. A personal computer has main memory of 32 k * 8 bytes and cache memory of 512 words. The cache is directly mapped with block size of 4 words.

a.     How many bits are required in Tag, index block and word fields of the address format?

OR

What are the various modes of data transfer between CPU and I/O devices? Explain in brief.