WIPRO Placement Paper - Tech Interview6

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 )


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