Explore topic-wise MCQs in Antenna Array.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Antenna Array knowledge and support exam preparation. Choose a topic below to get started.

1.

The maximum of the first minor lobe of array factor occurs at 13.46 dB down the maximum major lobe.

A. True
B. False
Answer» B. False
Discussion
2.

Condition for the half power width of the Array factor is given by ___________

A. \(\frac{Nᴪ}{2}=±1.391 \)
B. \(\frac{Nᴪ}{2}=±3\)
C. \(\frac{Nᴪ}{2}=±0.5\)
D. \(\frac{Nᴪ}{2}=±1\)
Answer» B. \(\frac{Nᴪ}{2}=±3\)
Discussion
3.

The radiating pattern of single element multiplied by the array factor simply gives the ___________

A. Pattern multiplication
B. Normalized array factor
C. Beamwidth of the array
D. Field strength of the array
Answer» B. Normalized array factor
Discussion
4.

Find the Nulls of the 8-element array in which elements are separated by λ/4 and phase difference is 0?

A. \(θ_n=cos^{-1}⁡(\left[±\frac{n}{2}\right])\)
B. \(θ_n=cos^{-1}⁡(\left[±\frac{n}{4}\right])\)
C. \(θ_n=sin^{-1}⁡(\left[±\frac{n}{2}\right])\)
D. \(θ_n=sin^{-1}⁡(\left[±\frac{n}{4}\right])\)
Answer» B. \(θ_n=cos^{-1}⁡(\left[±\frac{n}{4}\right])\)
Discussion
5.

Find the Nulls of the N-element array in which elements are separated by λ/4 and phase difference is 0?

A. \(θ_n=cos^{-1}⁡(\left[±\frac{4n}{N}\right])\)
B. \(θ_n=cos^{-1}⁡(\left[±\frac{2n}{N}\right])\)
C. \(θ_n=sin⁡(\left[±\frac{4n}{N}\right])\)
D. \(θ_n=sin^{-1}⁡(\left[±\frac{4n}{N}\right])\)
Answer» B. \(θ_n=cos^{-1}⁡(\left[±\frac{2n}{N}\right])\)
Discussion
6.

Find the maximum value of array factor when elements are separated by a λ/4 and phase difference is 0?

A. θm=cos-1⁡(4m)
B. θm=sin-1⁡(4πm)
C. θm=cos-1⁡(4πm)
D. θm=sin-1(2m)
Answer» B. θm=sin-1⁡(4πm)
Discussion
7.

Maximum value of array factor for N-element linear array occurs at ______

A. \(θ_m=cos^{-1}⁡(\frac{λ}{2πd}[-β±2πm])\)
B. \(θ_m=cos^{-1}⁡(\frac{λ}{2πd}[β±2πm])\)
C. \(θ_m=sin^{-1}⁡(\frac{λ}{2πd}[-β±2πm])\)
D. \(θ_m=sin^{-1}(\frac{λ}{2πd}[-β±2πm])\)
Answer» B. \(θ_m=cos^{-1}⁡(\frac{λ}{2πd}[β±2πm])\)
Discussion
8.

Which of the following expression gives the nulls for the N- element linear array?

A. \(θ_n=cos^{-1}⁡(\frac{λ}{2πd}[-β±\frac{2πn}{N}])\)
B. \(θ_n=sin^{-1}⁡(\frac{λ}{2πd}[-β±\frac{2πn}{N}])\)
C. \(θ_n=cos^{-1}⁡(\frac{λ}{2πd}[-β±\frac{πn}{N}])\)
D. \(θ_n=cos^{-1}⁡(\frac{λ}{2πd}[β±\frac{2πn}{N}])\)
Answer» B. \(θ_n=sin^{-1}⁡(\frac{λ}{2πd}[-β±\frac{2πn}{N}])\)
Discussion
9.

Normalized array factor of N –element linear array is ________

A. \(\frac{sin(Nᴪ/2)}{Nᴪ/2} \)
B. \(\frac{cos(Nᴪ/2)}{Nᴪ/2} \)
C. \(N\frac{sin(ᴪ/2)}{ᴪ/2} \)
D. \(N\frac{cos(Nᴪ/2)}{Nᴪ/2} \)
Answer» B. \(\frac{cos(Nᴪ/2)}{Nᴪ/2} \)
Discussion