# End Fire array MCQ’s

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

1. What is the phase excitation difference for an end-fire array?
a) 0
b) ±kd /2
c) π
d) ±kd

2. The phase excitation difference is zero in end-fire array.
a) True
b) False

3. The direction of maximum radiation in end-fire array is ______ with respect to the array axis.
a) 0° or 180°
b) 90°
c) 45°
d) 270°

4. What is the phase excitation difference in end-fire array with array spacing d at θ=0°?
a) −2πλd
b) 2πλd
c) −πλd
d) πλd

5. What is the progressive phase excitation of an end-fire array with element spacing λ/4 at θ=180°?
a) π2
b) −π2
c) π
d) π4

6. Which of the following is the correct condition of an ordinary end-fire array?
a) β=±kd
b) β=kd
c) β > kd
d) β < ±kd

7. Which of the following statements is true regarding end-fire array?
a) The necessary condition of an ordinary end-fire array is β=±kd+nπ
b) The phase excitation difference is zero
c) Same input current is fed through the array, but the phase excitation is varies progressively
d) Maximum radiation occurs at normal to the axis of array

8. Find the overall length of an end-fire array with 10 elements and spacing λ/4.
a) 9λ4
b) 5λ4
c) 5λ2
d) 9λ2

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