Modes of Radiation MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Modes of Radiation”.

1. In which of the following mode, the radiation is perpendicular to the axis of helical antenna?
a) Normal mode
b) Axial mode
c) Beam mode
d) End-fire mode

2. In which of the following mode the dimensions of the antenna must be smaller compared to the wavelength?
a) Normal mode
b) Axial mode
c) Beam mode
d) End-fire mode

3. Which of the following modes of radiation, the radiation of helical antenna is along the end-fire direction?
a) Axial mode
b) Normal mode
c) Perpendicular mode
d) Beam mode and Normal mode

4. Drawbacks of the normal mode of radiation in helical antenna are _______
a) low radiation efficiency and narrow bandwidth
b) high radiation efficiency and narrow bandwidth
c) low radiation efficiency and Broad bandwidth
d) high radiation efficiency and broad bandwidth

5. In which of the following mode, the helical antenna has narrow bandwidth?
a) Normal mode
b) Axial mode
c) Beam mode
d) End-fire mode

6. In which of the following modes, the dimension of the helical antenna circumference is greater than the wavelength?
a) Normal mode
b) Axial mode
c) Conical mode
d) Beam mode

7. Which of the following is true regarding the axial mode of radiation in helical antenna?
a) Radiation is broad, directional along axis and produces minor lobes
b) Radiation pattern is narrow and no minor lobes are produced
c) Minor lobes are produced only along the direction of helical axis
d) The dimensions of antenna are smaller than the wavelength

8. In which of the following mode, there are no minor lobes at oblique angles in radiation pattern?
a) Normal mode
b) Axial mode
c) Conical mode
d) Beam mode

9. The radiation pattern of the helical antenna is a combination of small dipole and loop antenna.
a) True
b) False

10. If the spacing between turns of the helical antenna is zero then it acts as a ________
a) Loop antenna
b) Linear dipole
c) Parabolic antenna
d) Log periodic antenna

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