Placement Papers: Hughes 04

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  1. an lead compensator zero is at Z = Zc, pole is at P = Pc then the following is correcta. Pc > Zc, pc < 0, zc < 0b. c.
  2. gain margin of g (s) h (s) = 1/s (s + k)
  3. machestor code does not improves
  4. possion distribution is used for used in FSM for queuing delay system of mutually identical events of arrival
  5. no. Of filpflops for mod 11 counter
  6. no of comparators required for 4 bit parallel A/D comparator
  7. if even parity is used for parity generation, what is the hamming distance (simple fig is given) ans: 2
  8. the code set is {00000, 00111,11100, 11011} , what is the error detecting and correcting capability? ans: 2,1
  9. operational amp characteristics following is correct:
    1. input impedance is 0
    2. output impedance is infinity
    3. input impedance is infinity
    4. gain is infinity which combinations are correct?
  10. band pass signal having frequencies 2.5k and 4.5k? give thesampling freq
  11. defination of avalanche diode multiplication
  12. more no of ripples are present in the diagram? which is correct
  13. if CPU have one interrupt pin and on to connect with external devices with some priority? which type of the following is used?
    1. parallel priority interrupt
    2. daisy chain
    3. ₹ filpflop
  14. one megabit file transfer, serially on 9600 baud one start bit and two stop bits, then how much time it takes (approx)
    1. 4 hours
    2. 2 hours
    3. 20 minutes
    4. 2 minutes
  15. IEEE 802.5 is ans: TOKEN RING
  16. Code sequence is givenwhat is the error correcting distance?
  17. bit stuffing used in HDLC Protocol forans: b is correct (read on text book)
  18. 19.20.

Section a and B: (BOTH MIXED)

  1. If “AaBbCc” is passed to the char char x (⚹ a) {a [0] x (a + 1) : 1; printf ( “% c” a [0] ) ; return 1;} what will be the output?
  2. f (⚹ p) {p = (char ⚹) malloc (6) ; p = “hello” return;} main () {char ⚹ p = “bye” f (p) ; printf ( “% s” p) ;} what is the o/p? ans: Bye
  3. when the program counter is incremented in the instruction cycle-fetch cycleb. Int cyclec. Execuation cycled.
  4. two sorted lists of n elements will take at least fine the order of complexity? a. 2nb. n/2c. Square (n)
  5. logic diagram is given? find the expressionans: OR gate
  6. question on JAVA stringans: String ends without a null character
  7. cache access time is 100ns. Main memory access time is 1000ns, hit ratio is 0.9, find mean access time? ans: 200ns
  8. which is not suitable to find out IP addressans: ARP
  9. about deadlock condition10. Convert 41.6875 into binary
  10. read about IP AND IPX12. Read about NFS13. DHCP is
  11. execution phase can be
  12. In public key algorithm, A wants to send message to B ________which key is used
  13. to prevent replay attacks in transmission
  14. virtual functionality is used in C ++
  15. if there are n nodes in a binary tree, how many null pointers are there ans: n + 1
  16. if heap sort contains n elements, no of comparsions required are
  17. which of the following is efficient in terms of space
  18. in 32 bit representation, the range of numbers in 2՚s complementform ans: 2 to the power of 31 to 2 to the power of 31 minus 1
  19. about normalization
  20. socket is implemented in TCP Layer. Which of the following is related to TCP layerans: Port number
  21. in reentrant procedure, which should be not used for passingparameters?
  22. which is related to threada. Separate switching reg b. “stackc.” address spaced.
  23. flow control is used for a. Congestion at receiver
  24. 5 questions on DBMS are there
  25. in global static variable, declartion in a file a. Localization of scope b. Persistance of the value through out the file
  26. in sorted table contains elements, which of the searching is false
  27. in demand paging overhead of context switching is more due to
  28. when write through is better than write back (related to cachememory)
  29. which is false when normalization is used? can՚t express
  30. I: Verification: Are we doing right product
  31. A table contains less than 10 elements which one is fastest
  32. about subroutine, precondition is false. What about post condition
  33. When static variables are used, which one of the following isnot possible? in product of x and y, if (x = 0|y = 0) y = 1; else y = 0 (not cleared) ; what is cyclometric complexity?
  34. CREATE TABLE NEW AS SELECT BIG FROM EMP The above SQL statement is correct or not (question is not cleared) ?
  35. path testing is
  36. program is given? above algorithm represents what type of search?
  37. if x ⇾ y in a relation R, x1 and x2 are in x, y1 and y2 are in y (question not cleared) , about functional dependancya. x1 = x2 and y1 = y2
  38. in a down loading from website, which one is correct? ans: Check the byte code and indicate the error, if any.
  39. about UDP one Address is given but that is not the state tablewhat will it do the packet
  40. in associated memory for fast accessing which one is used

Practice Sets

  1. what a java interface not have? ans instance variables
  2. what is done with java code on a web-page ans downloaded and executed on ur pc
  3. what is the order of deleting a node from a linked list given a ptr to it ans O (n) (since u have to traverse the list to reach the prev. Node)
  4. what is RSA
  5. how can A send a messageto B so that B knows its from A ans A uses his private key so that B can use A՚s public key
  6. what is the best sort in worst case, ans heap sort
  7. what is the given sorting, ans selection (check it)
  8. what can access protected memebers of a class, ans other classes of that program
  9. what protocol is used by a machine to map an ip to hardware address, ans arp
  10. what is the size of ipv6, ans 128 bits
  11. what protocol has ping, ans icmp
  12. how many keys are needed in symmetric and asymmetric crptography? ans i dont know
  13. one on a right threaded tree
  14. very easy k-map
  15. very easy ckt, ans choice which has option: a&c are equivalent
  16. what in unix doesnt have a fd, ans process (this was the first ques) .

Regarding Hughes

paper they conducted two tests. Both were technical (no aptitude test) . First one was compulsory for everybody. In second one could opt for electronics or computers. In all i suppose there were 50 questions. I sent a request to my classmates to send me questions whatevery they could recall. Till now only one person has responded. I am sending those questions to you.

And just before interview you were supposed to fill up a performa which they call Behavioural Test. This was to check you interpersonal skills and socialising capabilities. Questions like would you like to be elected leaders of organising committees, do you like peoply express their agonies to you, do you wish people be close to you type questions were repeated in one and the other form.

Interview was technical as well as personal. CGPA did count it seems. They selected 8 people from here. BTW what՚s your current CGPA and what՚s the strength of your class. Do they come for B. Tech and M. Tech separately as the case here is or it՚s all at once.


  1. If a precondition of a sub routine fails then
    1. post condition fails as well
    2. Post condition may fail
    3. post condition is declared but now defined.
  2. whatz the o/p of the following program char ⚹ a = “AabbCc” void x (char ⚹ a) {a [0] == 0? x (a + 1) : 1; printf ( “% c” ⚹ a) ; return 1;} x (a)
    1. AaBbCc
    2. cCbBaA
  3. What is DHCP used for?
  4. There are 2protocols IP and IPX are running on top of Ethernet. Suppose a packet addressed to that ethernt card arrives, to which protocol the ethernet sends the packet?
    1. It checks the payload of the frame and finds out the protocol type and despatches it to the right protocol
    2. It fins out the protocol type that is mentioned in the ethernet frame.
    3. despatches to both the protocol
  5. What is the use of global static variable in C?
  6. In which stage of the compilation the Macro in C are converted into Iline code (this is not the exact Qn a slight variation of it) ?

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