Introduction Online Exam Quiz
Introduction GK Quiz. Question and Answers related to Introduction. MCQ (Multiple Choice Questions with answers about Introduction
A uniform linear array contains ___
Options
A : N elements placed at equidistance and fed currents of equal magnitude and progressive phase shift
B : N elements at non-equidistance and fed currents of equal magnitude and progressive phase shift
C : N elements at equidistance and fed currents of unequal magnitude and progressive phase shift
D : N elements at equidistance and fed currents of unequal magnitude and equal phase shift
Find the maximum value of array factor when elements are separated by a ?/4 and phase difference is 0?
Options
A : ?m=cos-1?(4m)
B : ?m=sin-1?(4?m)
C : ?m=cos-1?(4?m)
D : ?m=sin-1(2m)
If the progressive shift in antenna array is equal to zero then it is called ___
Options
A : Broad side
B : End-fire
C : Yagi-uda
D : Fishbone antenna
Maximum value of array factor for N-element linear array occurs at __
Options
A : ?_m=cos^{-1}?(\frac{?}{2?d}[-??2?m])
B : ?_m=cos^{-1}?(\frac{?}{2?d}[??2?m])
C : ?_m=sin^{-1}?(\frac{?}{2?d}[-??2?m])
D : ?_m=sin^{-1}(\frac{?}{2?d}[-??2?m])
Normalized array factor of N ?element linear array is __
Options
A : \frac{sin(N?/2)}{N?/2}
B : \frac{cos(N?/2)}{N?/2}
C : N\frac{sin(?/2)}{?/2}
D : N\frac{cos(N?/2)}{N?/2}
Total resultant field obtained by the antenna array is given by which of following?
Options
A : Vector superposition of individual field from the element
B : Maximum field from individual sources in the array
C : Minimum field from individual sources in the array
D : Field from the individual source
What is the progressive phase shift of the end-fire array?
Options
A : 0
B : 90
C : 180
D : 60
Which of the following expression gives the nulls for the N- element linear array?
Options
A : ?_n=cos^{-1}?(\frac{?}{2?d}[-??\frac{2?n}{N}])
B : ?_n=sin^{-1}?(\frac{?}{2?d}[-??\frac{2?n}{N}])
C : ?_n=cos^{-1}?(\frac{?}{2?d}[-??\frac{?n}{N}])
D : ?_n=cos^{-1}?(\frac{?}{2?d}[??\frac{2?n}{N}])
Which of the following statement about antenna array is false?
Options
A : Field pattern is the product of individual elements in array
B : Field pattern is the sum of individual elements in array
C : Resultant field is the vector superposition of the fields from individual elements in array
D : High directivity can be achieved for long distance communications
Which of the following statement is true?
Options
A : As the number of elements increase in array it becomes more directive
B : As the number of elements increase in array it becomes less directive
C : Point to point communication is not possible with more number of array elements
D : There is no uniform progressive phase shift in linear uniform array
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