# Megamind-week (Mathematics)

20 Questions | Total Attempts: 44

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• 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