1 .  Convert the decimal number 456.7 89 to the following:
Binary number
BCD equivalent
Hexadecimal number
Octal number
3 . Make the logic diagram of the 4-bit serial shift register using J-K flip flops. Show the steps to shift the binary number 1001, through this shift register.
 

5. Describe the function of Cache Memory & Virtual Memory in memory organization.

Assignment B
 Case Detail:  
A digital computer has a memory unit with 24 bits per word. The instruction set consists of 150 different operations. All instructions have an operation code part (opcode) and an address part (allowing for only one address). Each instruction is stored in one word of memory
 
 Suppose we have the instruction Load 1000. Given that memory and register R1 contains the values tabulated below:
 
 
Memory Address    Value       
1000    1400       
---       
1100    400       
---       
1200    1000       
---       
1300    1100       
---       
1400    1300     
 
Assuming R1 is implied in the indexed addressing mode, determine the actual value loaded into the accumulator if R1= 200 and fill in the table below:

How many bits are needed for the opcode? How many bits are left for the address part of the instruction?

What is the maximum allowable size for memory?

What is the largest unsigned binary number that can be accommodated in one word of memory?

Assignment c
Question No.  1    
A microprocessor has a data bus with 32 lines and addresses bus with 20 lines. The
Maximum number of bits that can be stored in this memory is
Options    
32 x 220    
32 x 232    
20 x 220    
20 x 232
Question No.  2    
Which memory is faster?
Options    
Register    
Cache    
RAM    
Hard disk
Question No.  3    
Which of the following gates are called universal gates?     
Options    
AND and OR    
AND and NAND    
XOR and XNOR    
NAND and NOR
Question No.  4    
The decimal number +14 can be represented in 6 bit two’s complement format as     
Options    
010010    
101110    
001110    
110010
Question No.  5    
The full adder performs binary addition on--
Options    
2 binary digits    
3 binary digits    
2 decimal digits    
3 decimal digits    
Question No.  6    
Reverse polish notation is evaluated with the help of--
Options    
Stack    
RAM    
ROM    
None of the above
Question No.  7     
Pipeline arithmetic units are used to implement-- 
Options    
Floating-point operations    
Multiplication of fixed-point numbers    
A)  and B) both    
None of the above
Question No.  8    
In NOR latch, a race condition occurs when---    
Options    
R=0, S=0    
R=0, S=1    
R=1, S=0    
R=1, S=1
Question No.  9    
A register which can be incremented or decremented and whose primary function is a point to data is called-- 
Options    
Accumulator    
Program Counter    
Flat register    
Index register
Question No.  10     
Which of the following is not arithmetic instruction? 
Options    
MUL    
STORE    
INC    
NEG
Question No.  11     
The number of fetch operations to execute instruction having immediate operand is--
Options    
0    
1    
2    
NON OF THE ABOVE
Question No.  12    
In instruction cycle--
Options    
The indirect cycle is always followed by execute cycle    
Fetch cycle is always followed by interrupts    
Execute cycle and fetch cycles are simultaneously executed    
None of the above
Question No.  13    
Which of the following gates recognizes only words that have an odd number of 1s?     
Options    
Nand Gate    
Exclusive -OR gate    
NOR gate    
And Gate
Question No.  14    
Octal number system is--
Options    
A positional system with weights 0 to 9    
A positional system with weights 0 to 8    
A positional system with weights 0 to 7    
A non - positional system with weights 0 to 7
Question No.  15     
A CPU has a 16 bit program counter. This means that the CPU can address-- 
Options    
16 K memory locations    
32 K memory locations    
64 K memory locations    
256 K memory locations\
Question No.  16     
The sum of two hexadecimal numbers 23D and 9AA gives the hexadecimal number-- 
Options    
AF7    
BF6    
BE7    
BE5
Question No.  17    
Which of the following memory is not possible? 
Options    
10 bit address,12 bit cell size, 1024 cells    
9 bit address, 8 bit cell size 1024, cells    
11 bit address, 8 bit cell size, 1024 cells    
10 bit address, 8 bit cell size, 1024 cells
Question No.  18    
2's complement of 10101100 is--
Options    
1010100    
1100010    
1001001    
1100101

Question No.  19     
Virtual memory system allows the employment of--
Options    
The full address space    
More space than the address space    
More than the hard disk space    
Cache memory    
Question No.  20    
DMA module takes control of bus in order to transfer data when--    
Options    
Only when the CPU does not need the bus
The data is ready to transfer
Interrupt is being serviced by CPU
None of the above
Question No.  21     
Pseudo-operation means--    
Options        
Simulation of arithmetic operations
Directive to assembler to perform a specific operation
Those operations which produce single machine instructions    
None of the above
Question No.  22    
The typical microprocessor is most likely to contain--    
Options    
ALU
RAM
Power supply
Audio input pin
Question No.  23     
In register addressing mode operands are looked at--    
Options    
IN CACHE
In secondary storage
In CPU
In primary memory
Question No.  24     
The sum of two octal numbers 12 and 17 would be in octal as--    
Options    
    
21
23
29
31
Question No.  25     
The two parts of a microprocessor instruction are called operation and the--    
Options    
Operator
Operand
Observable
None of the above
Question No.  26    
An attempt to execute illegal of undefined instruction may lead to--    
Options        
TRAP event
I/O interrupt
CPU malfunctioning
None of the above
Question No.  27     
In karnaugh map of four variables A, B, C and D, the term--    
Options    
will cover a strip of two squares
will cover a strip of four squares
will cover a strip of three squares
will cover a strip of eight squares
Question No.  28    
In the memory hierarchy, the fastest memory is--    
Options    
SRAM
Cache
CPU registers
DRAM
Question No.  29     
The maximum number of directly addressable location in the memory of a processor having 10 bits wide control bus, 20 bit address bus and 8 -bit data bus is--    
Options        
1 K
2 K
1 M
2 M
Question No.  30     
Relocation of program is possible by--    
Options    
Dynamic programming
Suitably adjusting address sensitive operands in the program    
Using appropriate loader
None of these
Question No.  31    
What can be used to store one or more bits of data, which can accept and/or transfer information serially?    
Options    
Parallel registers
Shift registers
Counters
None of these
Question No.  32    
To avoid wastage of memory, the instruction length should be--    
Options        
Multiple of character size only
Of word size only
Of word size which is multiple of character size
None of these
Question No.  33    
DMA modules can communicate with CPU through--    
Options    
Interrupt
Cycle stealing
Branch instruction
None of these
Question No.  34     
The sequence of microinstructions is also known as--    
Options    
Software
Hardware
Firmware
None of these
Question No.  35     
The number of select input lines required for an 8 to 1 multiplexer is--    
Options    
1K
2K
1M
None of these
Question No.  36    
A CPU has a 16 bit program counter. This means that the CPU can address--    
Options        
16 K memory locations
32 K memory locations
64 K memory locations
256 K memory locations
Question No.  37     
The minimum numbers of bits required to represent numbers in the range -50 to 50 is-    
Options    
5
7
6
8
Question No.  38    
The sum of two hexadecimal numbers 23D and 9AA gives the hexadecimal numbe--r    
Options    
AF7
BF6
BE7
BE5
Question No.  39     
Stored program concept may provide--    
Options        
Maximal use of secondary storage
Program to modify its own instructions
Use of cache memory
None of the above
Question No.  40     
Viewing computers single addressable memory of unlimited size is connected with concept of --    
Options    
Virtual memory
Associative memory
Dynamic memory
None of the above
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