Antennas Mock Test 7

10%

Question 1 of 10

1. What is the value of T_m (0) when m is an even number?

(-1)^m

(-1)^m/2

-1

Question 1 of 10

Question 2 of 10

2. The condition for the existence of the main lobe according to the Chebyshev is _________

|x| > 1

|x| = 0

|x| < 1

2|x| > 1

Question 2 of 10

Question 3 of 10

3. What is the pitch angle if the separation of turns is at 2 cm and the circumference is of 4 cm?

62.65

26.56

25.34

Question 3 of 10

Question 4 of 10

4. What is the necessary condition for a helical antenna to operate in the axial mode?

πD ≈ λ

πD=0

πD << λ

πD ≈ nλ

Question 4 of 10

Question 5 of 10

5. The value of T_m(-1)=_______

(-1)^2m

(-1)^m/2

(-1)^m-1

(-1)^m

Question 5 of 10

Question 6 of 10

6. Which of the following feed techniques the reflect array used particularly?

Sub array

Parallel plate feed

Space feed

Constrained feed

Question 6 of 10

Question 7 of 10

7. A folded pillbox antenna is used in which of the following feeding system?

Constrained feed system

Parallel plate feed

Space feed

Optical feed system

Question 7 of 10

Question 8 of 10

8. What will be the array factor in polynomial form for the 3 element binomial array if Z=e^(-iᴪ)?

1+3z+3z²+z³

1+3z+z²

1+2z+3z²+z³

1+2z+z²

Question 8 of 10

Question 9 of 10

9. The value of T_m(z) in the range between -1 to 1 is ____

-1 to 1

0 to infinity

Question 9 of 10

Question 10 of 10

10. Which of the following is the key feature of the Chebyshev array?

Have varying side lobes and elements are placed uniformly

Major lobes are present at |x| < 1

Minor lobes are present at |x| > 1

Have constant side lobes and elements are placed uniformly

Question 10 of 10