Megamind-week (Mathematics)

20 Questions | Total Attempts: 44

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Megamind-week (Mathematics)


Questions and Answers
  • 1. 
    Which project 802 standard provides for a collision free protocol?
    • A. 

      802.2

    • B. 

      802.3

    • C. 

      802.4

    • D. 

      802.5

  • 2. 
     In ALOHA with a max propagation time of 2ms, which cannot be a possible back-off time for 4th retry? 
    • A. 

      40ms

    • B. 

      30ms

    • C. 

      20ms

    • D. 

      10ms

  • 3. 
    A 10 kHz baseband channel is used by a digital transmission system. Ideal pulses are sent at the Nyquist rate and the pulses can take 16 levels. What is the bit rate of the system? 
    • A. 

      8kbps

    • B. 

      80kbps

    • C. 

      8bps

    • D. 

      80bps

  • 4. 
    How does CSMA/CD react to collisions?
    • A. 

      All systems jam the network, and then all begin transmitting again.

    • B. 

      Hosts involved in a collision send an RTS signal indicating a time frame in which to retransmit.

    • C. 

      Hosts involved in the collision send a jam signal, and then run an algorithm before retransmitting.

    • D. 

      Collisions do not occur on CSMA/CD.

  • 5. 
    A device which changes the phase by 180degrees from on end but not from the other end is
    • A. 

      Circulator

    • B. 

      Isolator

    • C. 

      Gyrator

    • D. 

       Klystron

  • 6. 
    Which of the following is not true
    • A. 

      H(n)=y(n)/x(n)

    • B. 

      H(w)=Y(w)/X(w)

    • C. 

      H(z)=Y(z)/X(z)

    • D. 

      Y(w)=X(w)*H(w)

  • 7. 
    What is the major drawback of DSP
  • 8. 
    The OSI Reference Model layers, in order from top to bottom, are: 
    • A. 

      Application, Physical, Session, Transport, Network, Data Link, Presentation

    • B. 

      Application, Presentation, Network, Session, Transport, Data Link, Physical

    • C. 

      Physical, Data Link, Network, Transport, Session, Presentation, Application

    • D. 

      Application, Presentation, Session, Transport, Network, Data Link, Physical

  • 9. 
    Assume 6 devices are arranged in a mesh topology. How many cables are needed? How many ports are needed for each device?
    • A. 

      9,2

    • B. 

      11,3

    • C. 

      13,4

    • D. 

      15,5

  • 10. 
    Which filter can be designed by an odd and antisymmetric filter
    • A. 

      Band pass filter

    • B. 

      LPF

    • C. 

      HPF

    • D. 

      Band reject filter

  • 11. 
    Suppose that the ALOHA protocol is used to share a 56 kbps satellite channel. Suppose that frames are 1000 bits long. Find the maximum throughput of the system in frames/second.
    • A. 

      10 frames/ sec

    • B. 

      5 frames/ sec

    • C. 

      15 frames/ sec

    • D. 

      20 frames/ sec

  • 12. 
    Suppose that a modem can transmit 8 distinct tones at distinct frequencies. Every T seconds the modem transmits an arbitrary combination of tones. Then corresponding transmitted bit rate is...
    • A. 

      1/T bps

    • B. 

      2/T bps

    • C. 

      4/T bps

    • D. 

      8/T bps

  • 13. 
    Symmetry obtained in FIR filter due to
  • 14. 
    Radix2 algorithm can be applied only if the sequence length is in
  • 15. 
    Odd one out
    • A. 

      Prescalar

    • B. 

      Ripple counter

    • C. 

      Frequency divider

    • D. 

      Shift Register

  • 16. 
    How many bytes are needed for OUT and SBI instructions
    • A. 

      1,2

    • B. 

      2,1

    • C. 

      3,2

    • D. 

      1,3

  • 17. 
    Interrupt vectors are available in
    • A. 

      Stack memory

    • B. 

      Code memory

    • C. 

      Data memory

    • D. 

      Both a and b

  • 18. 
    What is the functionality of SE bit MCUCR
  • 19. 
    DFT can be applicable for sequences whose length is 
    • A. 

      Infinte

    • B. 

      Finite

    • C. 

      Both of them

  • 20. 
    Find order for analog chebyshev filter for αp=3dB ,αs=16 dB,fp=1KHz,fs=2KHz
    • A. 

      3

    • B. 

      2

    • C. 

      4

    • D. 

      1