# Radiation Pattern of 8-Isotropic Elements MCQ’s

This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Radiation Pattern of 8-Isotropic Elements”.

1. An 8-isotropic element broadside array separated by a λ/2 distance has nulls occurring at ____
a) cos−1(±n4)
b) cos−1(±n2)
c) sin−1(±n2)
d) sin−1(±n4)

2. An 8-isotropic element broadside array separated by a λ/4 distance has nulls occurring at ____
a) cos-1(±n)
b) cos−1(±n2)
c) sin−1(±n2)
d) sin−1(±n)

3. The array factor of 8 – isotropic elements of broadside array is given by ____
a) sin(2kdcosθ)2kdcosθ
b) sin(4kdcosθ)4kdcosθ
c) sin(2kdcosθ)kdcosθ
d) cos(2kdcosθ)2kdcosθ

4. The array factor of 8- isotropic elements of broadside array separated by a λ/4 is given by ____
a) sinc(cosθ)
b) cos(sinθ)
c) sin(sinθ)
d) sinc(2cosθ)

5. What is the direction of first null of broadside 8-element isotropic antenna having a separation of λ/2?
a) 60°
b) 75.5°
c) 37.5°
d) 57.5°

6. The necessary condition for maximum of the first side lobe of n element array is ______
a) Nᴪ2=±5π2
b) Nᴪ2=±3π2
c) Nᴪ2=±π2
d) Nᴪ2=±4π2

7. The array factor of 8 – isotropic elements of broadside array separated by a λ/2 is given by ____
a) sinc(4cosθ)
b) sin(2πcosθ)
c) sinc(4πsinθ)
d) sin(2sinθ)

8. What is the direction of first null of broadside 8-element isotropic antenna having a separation of \frac{λ}{4}?
a) 0
b) 60
c) 30
d) 120

9. The direction of the first minor lobe of 8 element isotropic broadside array separated by λ/2 is ___
a) 41.4°
b) 76.6°
c) 67.7°
d) 90°

10. An 8-isotropic element end-fire array separated by a λ/4 distance has first null occurring at ____
a) 60
b) 30
c) 90
d) 150

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