Wipro paper(System software) July-1997 ------------ PART --A ------------------------------------------------------ 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 --------------------------------------------------------------- PART-B ------- 1) 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 ------------------------------------------------- 3) 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 --------------------------------------------------- 4) question (3) in old paper 5) q(4) in old paper 6) question (7) in old paper 7) q(9) in old paper ------------------------------ Hughes,Delhi: ------------- > > (A)Aptitude :25 Qns, 20 Minutes > > > > 1. 2 x 4 analytical GRE type qns > > 2. 2-3 Reasoning qns (GRE type) > > 3. Probability of getting a sum of 7 when two dices are thrown together > > 4. Rest quantitative questions > > > > (B) Technical: 50 Qns, 45 Minutes > > > > 1. 3 qns on operating systems. I qn on dijkestra algorithm 1. 3 qns on operating systems. I qn on dijkestra algorithm > > > > 2. Using which pin it's possible to address 16 bit addresses even though there > > are only 8 address bits in 8085? Ans: ALE > > 3. Voltage gain for an amplifier is 100 while it is operating at 10 volts. > > What is the O/P voltage wen i/p is 1 volt > > 4. Quality factor indicates a0 Quality of inductor b) quality of capacitor > > c) both > > 5. Qns related to bridges, routers and generators, which OSI layer they > > corresspond to. (Refer to stevens 4th chapter) > > 6.OPAmp's I/P ciurrent, O/p current and CMRR is given, what is the voltage > > gain > > 7. 2-3 qns on scope of static variables in C. Qn to view o/p odf a C static > > var > > 8. Qn to print a value of a pointer > > 9.resistance increases with temperature in a) Metal b) semiconductor > > 10. A qn to find the physical address from a given virtual address, virtual > > to physical address table was provided > > 11. 16 bit mantissa and 8 bit exponent can present what maximum value? > > 12. 4 bit window size in sliding window protocol, how many acknowledements can be held? > > 13. Security functionality is provided by which layer of OSI > > 14. Frequency spectrums for AM, FM and PM (figure given, u'veto tell which > > Kind of modulation it belongs to) > > 15. Among AM and FM which is better and why? > > 16.LASt stage of TTL NAND gate is called: Ans: Totem Pole Amplifier > > 17. SR to JK flip flop conversion. Ans: S=JQ', R=KQ > > 18. LSB of a shift register is connected to its MSB, what is formed: Ans: > > RING Counter > > 19. 2-3 Qns based on Demorgan's laws (identiies: (A+b)' = A'b', etc) > > 20. 2 qns on Logic gates (O/p of logic gates) > > 21. Diff in IRET and RET statements of 8086 > > 22. How many address bytes are required to address an array of memory chips > > (4 * 6), each chip having 4 memory bits and 8k registers. > > 23. Diff. in memory mapped and I/P O/P mapped Input/Output (Refer a book 23. Diff. in memory mapped and I/P O/P mapped Input/Output (Refer a book on Microprocessor) > > 24. Qn on pipeline architecture > > 25 QN on LAPB protocol > >