# Array of N-Isotropic Sources Online Exam Quiz

Array of N-Isotropic Sources GK Quiz. Question and Answers related to Array of N-Isotropic Sources. MCQ (Multiple Choice Questions with answers about Array of N-Isotropic Sources

### Find the value ?n at which null occurs for an 8-element broadside array with spacing d.

Options

A : cos^{-1}?\frac{?n}{Nd}cos ?1 ?nNd

B : sin^{-1}?\frac{?n}{Nd}sin ?1 ?nNd

C : cos^{-1}?\frac{2?n}{Nd}cos ?1 2?nNd

D : sin^{-1}?\frac{2?n}{Nd}sin ?1 2?nNd

Options

A : 90?

B : 45?

C : 0?

D : 180?

### The Half-power beam width of the N-element isotropic source array can be known when ___

Options

A : ?=\frac{2.782}{N}

B : ?=\frac{1.391}{N}

C : ?=\frac{1.414}{N}

D : ?=\frac{3}{N}

### The necessary condition for the direction of maximum second side lobe level of the 4-element isotropic array is ___

Options

A : \frac{5}{4} ?

B : \frac{3}{4} ?

C : \frac{1}{8} ?

D : \frac{5}{8} ?

Options

A : 0

B : ?/2

C : ?

D : 3?/2

Options

A : 4?/2

B : ?/2

C : 3?/2

D : 5?/2

### Which of the following is the necessary condition to avoid grating lobes in N-Isotropic element array?

Options

A : \frac{d}{?}?\frac{1}{1+|cos?_m |}

B : \frac{d}{?}?\frac{1}{1+|cos?_m |}

C : \frac{?}{d}?\frac{1}{1+|cos?_m |}

D : \frac{?}{d}=\frac{1}{1+|cos?_m |}

Options

A : d < ?

B : d > ?

C : d=?

D : d < 2?

Options

A : d < ?/2

B : d < ?

C : d > ?/2

D : d=?

### Which of the following statements is false regarding a broadside array?

Options

A : The maximum radiation is normal to the axis of the array

B : Must have same amplitude excitation but different phase excitation among different elements

C : The spacing between elements must not equal to the integral multiples of ?

D : The phase excitation difference must be equal to zero

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