WIPRO

1) abcD+abcd+aBCd+aBCD

then the simplified function is

( Capital letters are copliments of corresponding letters A=compliment of a)


[a] a [b] ab [c] abc [d] a(bc)* [e] mone

(bc)*=compliment of bc


Ans: e

 

 


2) A 12 address lines maps to the memory of


[a] 1k bytes [b] 0.5k bytes [c] 2k bytes [d] none


Ans: b

 

 



3) In a processor these are 120 instructions . Bits needed to impliment

this instructions

[a] 6 [b] 7 [c] 10 [d] none


Ans: b

 

 


4) In 8085 microprocessor READY signal does.which of the following

is incorrect statements

[a]It is input to the microprocessor

[b] It sequences the instructions


Ans : b

 

 


5) Return address will be returned by function to

[a] Pushes to the stack by call

Ans : a

 

 


6)

n=7623

{

temp=n/10;

result=temp*10+ result;

n=n/10

}


Ans : 3267

 

 


7) If A>B then

F=F(G);

else B>C then

F=G(G);

in this , for 75% times A>B and 25% times B>C then,is 10000 instructions

are there ,then the ratio of F to G

[a] 7500:2500 [b] 7500:625 [c] 7500:625 if a=b=c else 7500:2500

 

 

8) In a compiler there is 36 bit for a word and to store a character 8bits are

needed. IN this to store a character two words are appended .Then for storing 
a K characters string, How many words are needed.

[a] 2k/9 [b] (2k+8)/9 [c] (k+8)/9 [d] 2*(k+8)/9 [e] none


Ans: a

 

 


9) C program code

int zap(int n)

{

if(n<=1)then zap=1;

else zap=zap(n-3)+zap(n-1);

}

then the call zap(6) gives the values of zap

[a] 8 [b] 9 [c] 6 [d] 12 [e] 15


Ans: b

 

 


10) Virtual memory size depends on

[a] address lines [b] data bus

[c] disc space [d] a & c [e] none


Ans : a


2) Critical section is

[a]

[b] statements which are accessing shared resourses

Ans : b

 

11) load a

mul a

store t1

load b

mul b

store t2

mul t2

add t1


then the content in accumulator is


Ans : a**2+b**4

12. Add 79H and 86H and tell the contents of flags

13. Scr is used for _____ ( ac, dc , both )

14. Push pull amplifier is used to remove which harmonics ( even , odd , both )

15. PAM is demodulated using ___ ( low pass filter , high pass filter )

16. 16k memory is needed. How many chips with 12 address buses and 4 data 
    buses are needed.

17. AM wave is detected using _________ detector

18. Which flip flop is used for shift registers 

19. Program counter does what __ (stores a memory address, address of the 
present instruction)

20. In a bistable multivibrator communication capacitor is used for ______         
( speed up response , ac coupling)

21. Totem pole is what?

22. Time costant for an integrator and differentiator should be 
( small , high etc.)

23.TV waves are __ ( sky waves , space waves etc.)

24.Which configuration has highest i/p imp. ( ce , cb , cc )

25. Parabolic antenna with 2degree angle. What is its directivity.

26. Given 10 mhz pe modulation and we got a 100 mhz band.   How many channels 
can be there.

27. If o/p power is doubled by how much does the sound increase ( 1db,2db,3db )