Antennas Mock Test 4

10%

Question 1 of 10

1. HPBW of E-plane horn with aperture dimension 10 λ in degrees is ____

5.6

6.7

Question 1 of 10

Question 2 of 10

2. A corner reflector is converted to plane reflector when the corner angle is ______

180°

90°

45°

60°

Question 2 of 10

Question 3 of 10

3. Find the directivity of a pyramidal horn antenna with E-plane aperture width 10λ and H-plane aperture width 15λ?

3.051dB

30.51dB

30.15dB

35.01dB

Question 3 of 10

Question 4 of 10

4. Find the length of the E-plane horn with aperture 12λ and path travel difference 0.4λ?

54 λ

3.5 λ

9 λ

45 λ

Question 4 of 10

Question 5 of 10

5. In order to achieve good system efficiency in a corner reflector, the spacing between the vertex and the feed must be ______ as included angle decreases.

Constant

Either increases or decreases

Decreased

Increased

Question 5 of 10

Question 6 of 10

6. Find the HPBW of the uniform rectangular aperture antenna with 4λ×2λ in the E-plane?

0.886

0.443

0.5

0.25

Question 6 of 10

Question 7 of 10

7. Which of the following is called as the source placed at the focus?

Feed radiator

Primary / reflector

Secondary radiator

Reflector

Question 7 of 10

Question 8 of 10

8. In which of the following cases, a parabolic reflector primary radiator is said to be ideal feed?

The entire reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

Some part of reflector is illuminated with radiation in unwanted direction when feed radiated entire energy towards it

Some part of reflector is illuminated with no radiation in unwanted direction when feed radiated entire energy towards it

The entire reflector is illuminated with small radiation in unwanted direction when feed radiated entire energy towards it

Question 8 of 10

Question 9 of 10

9. The number of images, polarity and position in the analysis of the radiation field of corner reflector depends on what?

Polarization of feed element

Both included angle & Polarization of feed element

Neither included angle nor Polarization of feed element

Only included angle

Question 9 of 10

Question 10 of 10

10. What are the length and the flare angle of the H-plane horn antenna with aperture 10 λ and path difference δ=0.2λ?

Length=31.8λ,flare angle=4.15°

Length=31.8λ,flare angle=9.14°

Length=62.5λ,flare angle=4.15°

Length=62.5λ,flare angle=9.14°

Question 10 of 10