Cognitive Radio Basics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Cognitive Radio Basics, a fundamental topic in the field of Cognitive Radio. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Cognitive Radio Basics MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Cognitive Radio Basics mcq questions that explore various aspects of Cognitive Radio Basics problems. Each MCQ is crafted to challenge your understanding of Cognitive Radio Basics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Cognitive Radio tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Cognitive Radio Basics MCQs are your pathway to success in mastering this essential Cognitive Radio topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Cognitive Radio Basics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Cognitive Radio Basics knowledge to the test? Let's get started with our carefully curated MCQs!

Cognitive Radio Basics MCQs | Page 10 of 11

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Q91.
Spectrum awareness prevents hidden node problem.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:Spectrum awareness is affected by hidden node problem. A receiver might experience interference but may be incapable of informing the cognitive radio. A cooperative approach may be used to mitigate the problem but it is not a complete solution.
Q92.
Which among the following does not have significant use for time of day information?

a.

Policy monitoring

b.

Global positioning system

c.

Geo-location

d.

Frequency division multiplexing

Discuss
Answer: (d).Frequency division multiplexing Explanation:Time awareness is essential for a radio to learn and behave. Time of the day information is used in time division multiplexing and for gating policies in and out. It is used to compensate propagation delay from satellites to GPS receiver such that there is only 340 ns jitter.
Q93.
____ in a radio system can be used to keep track of time of the day.

a.

Local oscillator

b.

Source

c.

Filter

d.

Amplifier

Discuss
Answer: (a).Local oscillator Explanation:Local oscillator is used as master timing control circuit in receivers of RF applications. It may also be used with mixer to change the frequency of a signal. Accuracy may be increased and jitter may be decreased by using complex circuitry.
Q94.
Atomic clocks have a stability of ____

a.

10⁻⁵

b.

10⁻⁸

c.

10⁻¹⁰

d.

10⁻¹¹

Discuss
Answer: (d).10⁻¹¹ Explanation:Atomic clocks have a stability of 10⁻¹¹ . However they consume high power and are large in size. Local oscillators have a stability of 10⁻⁶. Local oscillators drift over time and may result in inaccuracy of about 90 ns.
Q95.
A radio which enters into vibration mode autonomously is ____

a.

environment aware

b.

self aware

c.

spatially aware

d.

spectrum aware

Discuss
Answer: (c).spatially aware Explanation:A radio must be capable of supporting communication over wireless link, also must be capable of turning off communication under certain situations. This type of awareness is termed as spatial or situational awareness. For example, a radio that enters into vibration mode upon entering a movie theater autonomously.
Q96.
The ____ encourages that license holders in exclusive management policy bands be allowed to sublease their spectrum.

a.

Spectrum Policy Testing Facility

b.

Strategic Policy Testing Facility

c.

Spectrum Policy Task Force

d.

Strategic Policy Task Force

Discuss
Answer: (c).Spectrum Policy Task Force Explanation:The Spectrum Policy Task Force operates under Federal Communication Commission. Its primary goal is to evaluate policies and promote effective use of spectrum. It is also responsible for using the spectrum in such a way the public benefit is improved.
Q97.
Which among the following is not a recommendation of Spectrum Policy Task Force?

a.

Radio spectrum interference tolerance

b.

Quantity spectrum use

c.

Regulatory models for licensed and unlicensed users

d.

Single regulatory model

Discuss
Answer: (d).Single regulatory model Explanation:The Spectrum Policy Task Force does not encourage a single regulatory model applicable for all spectrums. It recommends a regulatory model that provides a balanced spectrum model. It includes the allocation of spectrum based on market oriented model.
Q98.
____ are spectrum bands that exist between channels to minimize interference.

a.

White noise

b.

White space

c.

Empty noise

d.

Empty space

Discuss
Answer: (b).White space Explanation:Spectrum Policy Task Force supports the use of white spaces between spectrums. Unlike analog signal, multiple digital signals can be packed into the spectrum bands, increasing transmission. Thus, white space can be utilized significantly.
Q99.
A policy must be verified by ____ for certification.

a.

policy scalability engine

b.

policy performance engine

c.

policy interpretation engine

d.

policy examination engine

Discuss
Answer: (c).policy interpretation engine Explanation:A policy may be written by regulatory agencies or by a third party which is later approved by regulatory agencies. A policy is a legal operating requirement and therefore must be verified by policy examination engine for certification.
Q100.
Cognitive radio requires ____ to interpret multiple rules and policies simultaneously.

a.

interpretation capability

b.

intuitive capability

c.

interference capability

d.

inference capability

Discuss
Answer: (d).inference capability Explanation:A variety of policies exists to accommodate and regulate various modes and environment. It is not possible to code every possibility in a radio and it becomes necessary for the radio to understand the policy. Cognitive radio must infer from policies provided they are defined using well known language framework.
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