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Friday, May 1, 2020

COA Question paper of 3rd Sem (2019)

Question bank of COA 
Sub Code: - 1618304 
2019 (Odd) 
Time :  3Hrs 
Sem. III / CSE 
 COA  
Full Marks : 70 
Pass marks : 28
    Group A
 1. 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 programming directly ?             
(a)  Zero flag             
 (b) Carry Flag             
(c) Auxiliary Carry flag             
(d) parity flag

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

(iv)       which of the memory holds the information when the power supply is switch off ?           
(a) Dynamic RAM           
(b) Static RAM             
(c) EEROM           
(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 based data transfer           
(b) DMA based data transfer           
(c) polled mode data transfer           
(d) All 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 times 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 number             
(c)  Real Integer           
(d) Boolean value 

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

(xi)  An instruction code is             
(a) An output of a programme             
(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 (PC) holds the address of             
 (a) The instruction is being executed             
(b) The next instruction to be read form 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 operation             
 (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 Octal   
(d) Both (b) and (c)

 (xvi)  The tendency of a processor to access the same set of memory locations respectively 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) Frame one instruction to a non-sequence instruction of a program     
(b) From our program to another     
(c) During execution of an instruction due to an interrupt cycle     
(d) None of the above statement is true

(xviii) A computer sues RAM chips of 1024 ×1 capacity . How many chips are needed to provide a     memory capacity  of 16 K bytes .   
(a) 16     
(b) 128       
(c) 32       
(d) None of these

(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 is :       
(a) Three address  instructions       
(b) Two address instructions     
(c) One address instructions       
(d) Zero address instructions

Group B
  ➥ Answer all Five Questions: -    (5×4=20) 

2.  Write steps to Multiply two negative number using booth algorithm
    OR 
 Write down the IEEE standards for floating point numbers

3.  What is ROM ? How does PROM differ from EEPROM ?
    OR 
 Write the help of block diagram, discuss working of direct memory access  (DMA) ?

4.  What are advantages and Disadvantages of hardwired and micro programmed  control ?
    OR  
 Define Cache memory.

5.  Define interrupt and its type.
    OR 
 What do you mean by pipeline in computer organization
   
6.  Define addressing mode and its type
    OR 
 Explain the role of stacks in programming

Group C 
➥ Answer all Five Questions: - (5 × 6=30)
 7.  Convert into binary
 (a) (0.375)10
 (b) (0.54545)10           
(c)  (38.210)10
     OR 

Covert into decimal
(a)  (73)8           
(b)   (125)8           
 (c)   (35)16 
       
8.  What is a micro- operation ? List and briefly explain the most commonly  encountered arithmetic operation
     OR 
What do you mean by control unit ? Describe briefly a hardwired control unit . Also give  its timing

9.  What do you mean by fetch cycle, instruction cycle, machine cycle , interrupt   acknowledgment cycle ?
     OR 
Discuss in brief (With their advantage and disadvantage )
(i)    RISC
(ii)    CISC

10.  An instruction is stored at location 300 with its address field at location 301. The address field has the value 400 A processor register R1 contains the number 200. Computer the effective address if the addressing mode of the  instruction is
     OR 
Explain the need of memory hierarchy with the help of a block diagram ? What is the reason for not having one large memory unit for storing all information at one place ?

11.  A person 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 (i) How many bits are required in Tag, index block and word field of the address format 
     OR 
What are various modes of data transfer between CPU and I/o devices ? explain  in  brief.

∎ By- Md Altaf Raja (CSE) 




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