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Antennas MCQ Questions & Answers

Antennas MCQs : This section focuses on the "Antennas". These Multiple Choice Questions (MCQs) should be practiced to improve the Antennas skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

In which of the following scanning the phase of the radiators varies incrementally for scan?

A. Phase scanning
B. Frequency scanning
C. IF scanning
D. Beam forming

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Question 2

In which of the following feed system, the power division among elements on aperture is done in several steps?

A. Constrained feed systems
B. Optical feed systems
C. Lens array
D. Reflect array

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Question 3

In which of the following type of scanning a heterodyne is used?

A. IF Scanning
B. Frequency scanning
C. Phase scanning
D. Digital beam-forming

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Question 4

A folded pillbox antenna is used in which of the following feeding system?

A. Parallel plate feed
B. Space feed
C. Optical feed system
D. Constrained feed system

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Question 5

Antenna synthesis is analogous to _________.

A. Antenna array
B. Antenna analysis
C. Antenna radiation
D. Schelkunoff synthesis

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Question 6

Which of the following is mainly used in electronic scanning?

A. Phase shifters
B. Amplifiers
C. Repeaters
D. Limiters

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Question 7

In which of the following the power is divided in single step among the elements?

A. Optical feed system
B. Constrained feed system
C. Parallel feed system
D. Sub-array

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Question 8

In Frequency scanning, the phase of all radiators is constant for the frequency tuned at that instant.

A. True
B. False

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Question 9

Which of the following is the key feature of the Chebyshev array?

A. Have constant side lobes and elements are placed uniformly
B. Have varying side lobes and elements are placed uniformly
C. Minor lobes are present at |x| > 1
D. Major lobes are present at |x| < 1

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Question 10

In which of the following method is popularly used for beam shaping in antenna synthesis?

A. Woodward
B. Schelkunoff
C. Fourier
D. Taylor

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Question 11

The noise detection and suppression is possible with adaptive arrays.

A. True
B. False

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Question 12

In which of the following methods nulls are introduced in the desired direction of pattern?

A. Schelkunoff
B. Taylor
C. Woodward
D. Fourier

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Question 13

Which of the following series feed has same bandwidth similar to parallel feed network?

A. End fed array
B. Center fed array
C. Both end fed and Center fed array
D. Neither End fed nor center fed array

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Question 14

In which of the following the noise interference is detected and is suppressed further?

A. Adaptive arrays
B. Phased array
C. Planar array
D. Sub-array

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Question 15

In which of the following the nulls are introduced effectively when different other users interferes the desired user?

A. Adaptive array
B. Switching beam
C. Phased array
D. Sub-array

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Question 16

The power divider used to connect array elements to single port is called _____

A. array feed
B. phase shifter
C. frequency shifter
D. repeater

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Question 17

In Chebyshev array, its array factor is approximated to Chebyshev polynomial.

A. True
B. False

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Question 18

Adaptive arrays provide best results compared to switching beams under more interference.

A. True
B. False

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Question 19

In which of the following method is used for antenna design with no side lobes?

A. Binomial array
B. Dolph Chebyshev
C. Schelkunoff
D. Woodward

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Question 20

Parallel plate feed is a cross of constrained and space feed.

A. True
B. False

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Question 21

________ is used to obtain array with any desired side lobe level.

A. Chebyshev
B. Schelkunoff
C. Woodward-Lawson
D. Binomial

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Question 22

In which of the following the feed is provided at the end of the array?

A. Series end fed
B. Series center fed
C. Parallel feed
D. Optical feed systems

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Question 23

Electronic scanning is more advantageous compared to mechanical scanning

A. True
B. False

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Question 24

In which of the following principle is used in the phased array radar?

A. Interference
B. Diffraction
C. Reflection
D. Refraction

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Question 25

_________ is used to guide the beam in desired direction and place nulls in unwanted direction/interference.

A. Adaptive array
B. Switching beam
C. Phased array
D. Pulse radar

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Question 26

Which of the following statement is true?

A. Lens array has different input and output radiators while same radiator is used for reflector array
B. There is no surface matching required for the lens array
C. In lens and reflect array same radiator is used for input and output
D. Lens and reflect array belong to constrained feed systems

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Question 27

In which of the following feed techniques the reflect array used particularly?

A. Space feed
B. Constrained feed
C. Parallel plate feed
D. Sub array

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Question 28

Phase array with lens array come under which feeding system?

A. Optical-feed system
B. Constrained feed system
C. Sub array feed
D. Phase shifter

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Question 29

In which of the following radiators are combined into sub-arrays and then fed to elements in end or center fed?

A. Parallel feed
B. Series feed
C. Optical feed system
D. Series end feed

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Question 30

In which of the following is not a technique of antenna synthesis?

A. Woodward
B. Schelkunoff
C. Fourier
D. Thinning

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Question 31

In which of the following a single radiator source is used to feed antenna with different phase shifts?

A. Phased array
B. FMCW radar
C. Monopulse radar
D. CW radar

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Question 32

Antenna synthesis is inverse process to antenna analysis.

A. True
B. False

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Question 33

In which of the following scanning the phase of the radiator is constant at one frequency?

A. Phase scanning
B. Frequency scanning
C. Both Phase and frequency scanning
D. Neither Frequency nor Phase scanning

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Question 34

In which of the following synthesis method have a constant inner minor lobe level and remaining one decreasing gradually?

A. Woodward
B. Schelkunoff
C. Fourier
D. Taylor

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Question 35

In which of the following a real time adaptive signal processor is used?

A. Adaptive array
B. Phased array
C. Pulse radar
D. CW radar

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Question 36

In which of the following is not a benefit of the adaptive array technology?

A. Co-channel interference reduction
B. Reduction in multipath interference
C. Increase in multipath interference
D. Reduction in handoffs

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Question 37

Which of the following statements is false?

A. The intra cellular handoffs are less in adaptive array compared to switching beams
B. Noise interference cannot be detected in adaptive arrays effectively compared to switching beams
C. Advanced digital signal processors are used in adaptive arrays
D. Algorithms used in adaptive array is more complex than switching beams

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