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05.11.2020_EC8071_CR_MODEL EXAM-2_PART-B

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05.11.2020_EC8071_CR_MODEL EXAM-2_PART-B
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

1.Which of the following, gives the closest meaning to the term,'cognitive' in the context of Cognitive Radio? (CO1) (B4).

The ability to think and decide
The ability to donate
The ability to fight
The ability to speak

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

2.Due to the lack of exclusivity among the users,in the unlicensed spectrum ,which among the following becomes the biggest problem to radio users?. (CO1) (B4).

interference
signal jamming
noise
attenuation

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

3. Which among the following is another Software Radio Technology, in that few or all the physical layer functions of a radio transceiver are controlled by software? (CO1) (B4).

Software Defined Radio
Software Denoted Radio
Software Controlled Radio
Hard-wired Radio

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

4.Assuming a 6 MHz TV channel bandwidth and a 40:1 over subscription ratio resulting from the stochastic nature of the data network usage, this translates into a total of ________________________user terminals that can be served by the base station per TV channel. (CO2)(B5).

511
127
1023
255

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

5.The purpose of Coexistence window in a MAC frame is_________________________ (CO2) (B4).<br />

to ensure the maximum utilization of spectrum
to reduce the error in transmission
to increase the frame rate
to reduce noise

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

6.In 802.22 services - Spectrum Management Model ,each BS inside a WRAN will have a central entity which is assumed as a___________________ (CO2) (B4).

Spectrum manager
Spectrum server
spectrum allocator
spectrum agent

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

7.A CR transmitter can have a good line-of-sight to a receiver, but may not be able to detect the transmitter due to the __________________ (CO3) (B4).

Receiver uncertainty
Shadowing uncertainity
Physical Uncertainity
Transformal Uncertainity

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