# 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

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

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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