Antennas Mock Test 8

10%

Question 1 of 10

1. In which of the following region of the log periodic array, maximum radiation takes place?

Reflective region

Inactive stop region

Active region

Inactive transmission line region

Question 1 of 10

Question 2 of 10

2. Which of the following antenna is known as Frequency Independent antenna?

Rhombic antenna

Dipole antenna

LPDA

Yagi-Uda antenna

Question 2 of 10

Question 3 of 10

3. The geometrical design of the Log periodic depends on _____

Stability

Scaling factor

Impedance

Gain

Question 3 of 10

Question 4 of 10

4. Which of the following is the condition for the Log periodic antenna to be inactive transmission line region?

\(L=\frac{λ}{2} \)

\(L < \frac{λ}{2} \)

\(L = \frac{λ}{4} \)

\(L > \frac{λ}{2} \)

Question 4 of 10

Question 5 of 10

5. If there are no any reflections, then the value of the SWR will be ________________

∞

Question 5 of 10

Question 6 of 10

6. The empirical formula for the measurement of the high VSWR is give by ____

\(VSWR =\frac{λ_g}{π(d_2-d_1)}\)

\(VSWR =\frac{λ_g}{2(d_2-d_1)}\)

\(VSWR =\frac{2λ_g}{(d_2-d_1)}\)

\(VSWR =\frac{λ_c}{π(d_2-d_1)}\)

Question 6 of 10

Question 7 of 10

7. If the spacing between turns of the helical antenna is zero then it acts as a ________

Loop antenna

Linear dipole

Log periodic antenna

Parabolic antenna

Question 7 of 10

Question 8 of 10

8. In which of the following mode, there are no minor lobes at oblique angles in radiation pattern?

Axial mode

Normal mode

Beam mode

Conical mode

Question 8 of 10

Question 9 of 10

9. For AUT to encounter uniform illumination which of the following is true?

Height of AUT should be equal to or more than two times the dimension of antenna

Height of AUT should be less than four times the dimension of antenna

Height of AUT should be equal to or more than four times the dimension of antenna

Height of AUT should be less than two times the dimension of antenna

Question 9 of 10

Question 10 of 10

10. Which of the following is a narrow band antenna?

Log periodic antenna

Horn antenna

Yagi-Uda antenna

Rhombic antenna

Question 10 of 10