Introduction to Log Periodic Antenna MCQ’s

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This set of Antenna Multiple Choice Questions & Answers (MCQs) focuses on “Introduction to Log Periodic Antenna”.

1. Which of the following band of frequency the LPDA operates?
a) VHF & UHF
b) UHF & MF
c) MF & HF
d) HF & UHF

2. In frequency independent antennas, the antennas are defined in terms of _________
a) Angles
b) Wavelengths
c) Range
d) Frequency

3. Frequency range of LPDA is ________
a) 3 MHz to 30 MHz
b) 30 KHz to 30 GHz
c) 30 MHz to 3 GHz
d) 300 KHz to 300GHz

4. The relation between the dipole lengths and the scaling factor τ in LPDA is given by _________
a) \frac{L_N}{L_{N+1}} =τ
b) \frac{L_N}{L_{N+1}} =\frac{1}{τ}
c) \frac{L_N}{L_{N+2}} =τ
d) \frac{L_{N+2}}{L_N} =τ

5. The ratio of adjacent spacing of dipoles and its lengths in the LPDA are not equal.
a) True
b) False

6. Which of the following expression is correct?
a) \frac{L_N}{L_{N+1}} = \frac{S_N}{S_{N+1}} = τ
b) \frac{L_N}{L_{N+1}} = \frac{S_{N+1}}{S_N} = τ
c) \frac{L_N}{L_{N+1}} = \frac{S_{N+1}}{S_N} = \frac{1}{τ}
d) \frac{L_N}{L_{N+1}} = \frac{S_N}{S_{N+1}} = \frac{1}{τ}

7. Which of the following statement is false?
a) LPDA is a frequency independent antenna
b) In LPDA the lengths of the dipoles increases from the apex of the feed line toward other end
c) The included angle varies as the length of the dipole changes from the apex of feed line
d) The spacing between adjacent dipoles and their lengths are in same ratio

8. The relation between the dipole spacing and the scaling factor τ in LPDA is given by _________
a) \frac{S_N}{S_{N+1}} = τ
b) \frac{S_N}{S_{N+1}} = \frac{1}{τ}
c) \frac{S_N}{S_{N+2}} = τ
d) \frac{S_{N+2}}{S_N} = τ

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