# 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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