Helical Antenna MCQ’s

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

1. What is the pitch angle of the helical antenna to become a loop antenna?
a) 90
b) 0
c) 45
d) 60

2. What is the pitch angle if the separation of turns is at 2 cm and the circumference is of 4 cm?
a) 26.56
b) 62.65
c) 30
d) 25.34

3. Which of the following modes does the condition πD << λ is satisfied in helical antenna?
a) Axial mode
b) Normal mode
c) Conical mode
d) Axial, Normal and Conical

4. What is the necessary condition for a helical antenna to operate in the axial mode?
a) πD << λ
b) πD ≈ λ
c) πD ≈ nλ
d) πD=0

5. What is the Input impedance of the axial feed helical antenna with circumference per unit wavelength is 1.2?
a) 168Ω
b) 186Ω
c) 198Ω
d) 158Ω

6. The Axial ratio of the helical antenna with 3 turns is _____
a) 1.11
b) 0.89
c) 6
d) 0.98

7. What is the pitch angle of the helical antenna to become a linear antenna?
a) 90
b) 0
c) 45
d) 60

8. What is the total axial length of the helical antenna with 5 turns and circumference per wavelength is 1.2 and separation between turns is 2 cm?
a) 10cm
b) 20cm
c) 6cm
d) 12cm

9. Find the number of turns in the helical antenna with directivity 120 and Cλ=1 and pitch angle 6°.
a) 100
b) 50
c) 120
d) 12

10. Which of the following type does helical antenna belongs to?
a) Wire type
b) Aperture
c) Reflector
d) Array

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