Q.1
Which of the following type does helical antenna belongs to?
  • a) Wire type
  • b) Aperture
  • c) Reflector
  • d) Array
Q.2
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
Q.3
What is the pitch angle of the helical antenna to become a loop antenna?
  • a) 90
  • b) 0
  • c) 45
  • d) 60
Q.4
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
Q.5
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
Q.6
What is the pitch angle of the helical antenna to become a linear antenna?
  • a) 90
  • b) 0
  • c) 45
  • d) 60
Q.7
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
Q.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
Q.9
The Axial ratio of the helical antenna with 3 turns is _____
  • a) 1.11
  • b) 0.89
  • c) 6
  • d) 0.98
Q.10
Find the number of turns in the helical antenna with directivityand Cλ=1 and pitch angle 6°.
  • a) 100
  • b) 50
  • c) 120
  • d) 12
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