# Radiation Pattern for 4-Isotropic Elements MCQ’s

This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Radiation Pattern for 4-Isotropic Elements”.

1. A 4-isotropic element broadside array separated by a λ/2 distance has nulls occurring at ____________
a) cos^{-1} (±\frac{n}{2})
b) cos^{-1} (±\frac{4n}{2})
c) sin^{-1} (±\frac{n}{2})
d) sin^{-1} (±\frac{n}{4})

2. A 4-isotropic element broadside array separated by a λ/4 distance has nulls occurring at ____________
a) cos-1 (±n)
b) cos^{-1} (±\frac{n}{2})
c) sin^{-1} (±\frac{n}{2})
d) sin-1 (±n)

3. The array factor of 4- isotropic elements of broadside array is given by ____________
a) \frac{sin(2kdcosθ)}{2kdcosθ}
b) \frac{sin(kdcosθ)}{2kdcosθ}
c) \frac{sin(2kdcosθ)}{kdcosθ}
d) \frac{cos(2kdcosθ)}{2kdcosθ}

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

5. What is the direction of first null of broadside 4-element isotropic antenna having a separation of λ/2?
a) 60°
b) 30°
c) 180°
d) 0°

6. The necessary condition for maximum of the second side lobe of n element array is __________
a) \frac{Nᴪ}{2}=±\frac{5π}{2}
b) \frac{Nᴪ}{2}=±\frac{3π}{2}
c) \frac{Nᴪ}{2}=±\frac{π}{2}
d) \frac{Nᴪ}{2}=±\frac{4π}{2}

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

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

9. The direction of the first minor lobe of 4 element isotropic broadside array separated by λ/2 is ___________
a) 41.4°
b) 30°
c) 60°
d) 90°

10. A 4-isotropic element end-fire array separated by a λ/4 distance has first null occurring at ____________
a) 60
b) 30
c) 90
d) 150 5 Star
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