Placement Papers: STMicroelectronics Placement Paper Technical

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  1. Which conversion is not possible

    1. float to int

    2. int to float

    3. char to float

    4. all are possible

    Ans: d

  2. Threads have which thing in common

  3. One question like main () { int x = 5, y; y = x * x + + * + + x;//print x and y }

  4. A cpu has four group of instruction set A, B, C, D CPI of A = 1 CPI of B = 3 Cpi of c = 2 cpi of d = 4 the cpu access 20% of A, 30% of b, 30% of C and 20 % of D what will be the average CPI. Ans: 1 * 20/100 + 3 * 30/100 + 2 * 30/100 + 4 * 20/100

  5. A question on hit ratio n effective memory access time.

  6. main () int a = 10, b = 5 while (--b> = 0 && + + a) {--b; + + a; } print (a); print (b); Ans: a = 16, b = -2

  7. main () char i; for (i = 0; i ⇐ 255; i + + ) { printf ( “%c” i); } Ans: Never ending loop

  8. One question on controls systems to find the transfer function poles n zeroes were given in a graph Ans: s (s − 2)/(s − 3) (s − 4)

  9. one question on sampling theorem, if sampling frequency is fs then the signal having same characteristics will be of frequency.

  10. one on the signal to noise ratio: if the amplitude of the signal is reduced to half & N bits samples r used with M quantization level, then the SNR will be reduced by a factor of Ans: 6 db

  11. Question on calculating the bit rate to be transmitted across the given capacity channel

  12. calculating the checksum for the bits to be transmitted given the frame-11000101 and generator is1100.

  13. calculating the no of bits required for the error detection & the error correction for the given codeword set. Codeword a: 0000 0001 0011 1111 codeword b: 101111 110101

  14. options were given to choose as which was an example of multitasking.

    1. multiple remote users accessing a server

    2. user working on spreadsheet, downloading some matter from internet

    3. multiple programs resident in memory

  15. CA in CSMA/CA stands for

    1. collision approval

    2. collision avoidance

    3. critical access

  16. in a triangle, without changing the angle, if we double the sides, then new area will be Ans. Four times

  17. there is a pipe having diameter 6mm, then how many pipes having 1mm diameter will be needed to provide same amount of water. Ans. 36

  18. in which of the following schemes after page replacement the entered page will enter in the same memory location as of the replaced one

    1. direct mapping (Ans)

    2. n-set associative

    3. associative

    4. none of them

  19. belady anamoly is related to. Ans. Page replacement algorithm

  20. which one uses cache mechanism Ans TLB

  21. what will happen in following code. Signal (mutex) critical section wait (mutex) ans. Violation of mutual exclusion

  22. an RLC ckt was given, functioning of ckt to be determined.

    1. will act like FM

    2. PM

    3. AM

    4. none of the above

  23. int i = 0; switch (i) { case 1: Printf ( “hi” ); case 0: Printf ( “zero” ); case 2: Printf ( “world” ); } Ans: Zeroworld

  24. which one is the declaration of static string

    1. static string

    2. ‘static string’

    3. “static string”

    4. char sting[30]

  25. A question on file handling in c

    1. file cant be opened

    2. msg. Txt is copied to msg

    3. only first string be copied

  26. which of the function will store a 100 char string in X

    1. fread (x, 100, ____)

    2. fread (100, x, ____)

    3. gets (x)

    4. read (x)

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