Phased Array Basics MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Phased Array Basics”.

1. Which of the following principle is used in the phased array radar?
a) Interference
b) Diffraction
c) Reflection
d) Refraction

3. Electronic scanning is more advantageous compared to mechanical scanning
a) True
b) False

3. In which of the following a single radiator source is used to feed antenna with different phase shifts?
a) Phased array
b) FMCW radar
c) Monopulse radar
d) CW radar

4. What is the phase shift of the array is the scan angle is 30° and spacing distance is λ/2?
a) π2
b) π
c) 2π
d) π4

5. In Frequency scanning, the phase of all radiators is constant for the frequency tuned at that instant
a) True
b) False

6. In which of the following scanning the phase of the radiator is constant at one frequency?
a) Phase scanning
b) Frequency scanning
c) Both Phase and frequency scanning
d) Neither Frequency nor Phase scanning

7. Which of the following equation gives the incremental phase shift of the phase array radar with d element spacing and scan angle θ?
a) ᴪ=2πλdsinθ
b) ᴪ=2πdλsinθ
c) ᴪ=πλdsinθ
d) ᴪ=πdλsinθ

8. In which of the following type of scanning a heterodyne is used?
a) IF Scanning
b) Frequency scanning
c) Phase scanning
d) Digital beam-forming

9. Which of the following is mainly used in electronic scanning?
a) Phase shifters
b) Amplifiers
c) Repeaters
d) Limiters

10. In which of the following scanning the phase of the radiators varies incrementally for scan?
a) Phase scanning
b) Frequency scanning
c) IF scanning
d) Beam forming

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