Technology Tradeoffs in Software Defined Radio MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Technology Tradeoffs in Software Defined Radio, 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 Technology Tradeoffs in Software Defined Radio 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 Technology Tradeoffs in Software Defined Radio mcq questions that explore various aspects of Technology Tradeoffs in Software Defined Radio problems. Each MCQ is crafted to challenge your understanding of Technology Tradeoffs in Software Defined Radio 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 Technology Tradeoffs in Software Defined Radio MCQs are your pathway to success in mastering this essential Cognitive Radio topic.

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Technology Tradeoffs in Software Defined Radio MCQs | Page 6 of 17

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Q51.
RF MEMS allows selection of ____ and ____, increasing the degree of freedom in design process.

a.

digital circuit and reverse engineering

b.

analog circuit and reverse engineering

c.

digital circuit and reengineering

d.

analog circuit and reengineering

Discuss
Answer: (b).analog circuit and reverse engineering Explanation:RF MEMS allows the selection of switches from a collection of analog circuit and components. This is the direct implementation of MEMS in the design. Reengineering and selection of analog circuits are according to the programmability requirements of software defined radio.
Q52.
Superconducting analog filters can reduce noise and interference introduced by wide bandwidth of SDR architecture.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True Explanation:Superconducting analog filters can reduce noise and interference introduced by wide bandwidth of SDR architecture. The combined use of superconducting filter and regular anti-aliasing filter can offer better spectral purity.
Q53.
Superconductors use ____ to maintain working temperature near _____.

a.

heat sinks, 70K

b.

open cooling system, 80K

c.

forced air, 75K

d.

closed cooling system, 70K

Discuss
Answer: (d).closed cooling system, 70K Explanation:Superconductor analog filters make use of closed cooling system, and thermo-electric coolers to maintain working temperature near 70K.
Q54.
F amplifiers tend to be ____ amplifiers.

a.

class A

b.

class B

c.

class C

d.

class AB

Discuss
Answer: (c).class C Explanation:RF amplifiers operate in saturated mode (class C). It non-linearly distorts the waveform. Class A, class B, and class AB are linear amplifiers. The output signals are linearly related to input signals.
Q55.
Which of the following modulation type is incompatible with class C operation?

a.

Frequency modulation

b.

BPSK

c.

QPSK

d.

QAM

Discuss
Answer: (d).QAM Explanation:Class C operation is incompatible with amplitude sensitive modulation type such as QAM. However it does not face any complication with amplitude insensitive modulation type such as FM.
Q56.
Electronically Programmable Analog Components are also called as ____

a.

FPGA

b.

FPAA

c.

Gate Array ASIC

d.

Cell based ASIC

Discuss
Answer: (c).Gate Array ASIC Explanation:Electronically Programmable Analog Components (EPACs) are also called as Field Programmable Analog Array (FPAAs). FPAAs combine conventional analog circuit such as filter, amplifier with programmable interconnect.
Q57.
Which of the following is not a challenge to RF/IF conversion stage in military application?

a.

Low phase noise

b.

Tunable pre-selector

c.

Single RF/IF up-down conversion

d.

Fast tuning synthesizers

Discuss
Answer: (c).Single RF/IF up-down conversion Explanation:Tunable pre-selector is required for co-site rejection. Low phase noise and fast tuning synthesizers are required for JTIDS and EPLRS. Single RF/IF up-down conversion is a commercial application challenge.
Q58.
____ fixes the input power dynamic range such that there are no sinusoidal RF conversion artifacts in the output.

a.

Noise Figure

b.

Two tone intermodulation product

c.

Harmonics

d.

SFDR

Discuss
Answer: (d).SFDR Explanation:Spurious Free Dynamic Range (SFDR) fixes the input power dynamic range such that there are sinusoidal RF artifacts in the output. The artifacts tend to mask weak signal.
Q59.
The Nyquist criterion states that the sampling frequency of a band limited analog waveform must be at least ______ component to properly reconstruct the signal.

a.

half the maximum frequency

b.

twice the maximum frequency

c.

half the minimum frequency

d.

twice the minimum frequency

Discuss
Answer: (b).twice the maximum frequency Explanation:The Nyquist criterion states that the sampling frequency of a band limited analog waveform must be at least twice the maximum frequency component to properly reconstruct the signal. Aliasing can be overcome by meeting Nyquist criterion and using filters.
Q60.
The useful dynamic range applicable for antenna, RF/IF conversion, and ADC’s is given by the ratio of smallest processable signal to the smallest detectable signal.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False Explanation:The useful dynamic range is given by the ratio of largest processable signal to the smallest detectable signal. It is applicable for antenna, RF/IF conversion, and ADC’s. Dynamic range is one of the controlling parameters in the design of software defined radio.
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