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
In Broadside array the maximum radiation is directed with respected to the array axis at an angle__
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} ?
What is the phase excitation difference for a broadside array?
Options
A : 0
B : ?/2
C : ?
D : 3?/2
Which of the following cannot be the separation between elements in a broadside array to avoid grating lobes?
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 |}
Which of the following is the necessary condition to avoid grating lobes in N-Isotropic element broadside array?
Options
A : d < ?
B : d > ?
C : d=?
D : d < 2?
Which of the following is the necessary condition to avoid grating lobes in N-Isotropic element end-fire array?
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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