Antennas Mock Test 1

10%

Question 1 of 10

1. If physical aperture of antenna is 0.02m² and aperture efficiency is 0.5, then what is the value of effective aperture?

25m²

0.01m²

0.001m²

0.0004m²

Question 1 of 10

Question 2 of 10

2. What is the effective aperture of a Half-wave dipole operating at 100MHz?

1.07m²

1.77m²

1.17m²

1.27m²

Question 2 of 10

Question 3 of 10

3. Directive gain with maximum radiation intensity is called as Directivity.

False

True

Question 3 of 10

Question 4 of 10

4. An ideal source in which the power is radiated equally in all directions is called as ________ radiator.

Transducer

Omni-directional

Directional

Isotropic

Question 4 of 10

Question 5 of 10

5. Which pattern represents a plot with magnitude of field strength Vs θ at a constant φ?

Power pattern

H-plane pattern

Horizontal pattern

E-plane pattern

Question 5 of 10

Question 6 of 10

6. In Isotropic radiation, which of the following vector component is absent in pointing vector?

\(\widehat{a_\theta}\)

\(\widehat{a_\emptyset}\)

Both \(\widehat{a_\theta} \,and\, \widehat{a_\emptyset} \)

\(\widehat{a_r}\)

Question 6 of 10

Question 7 of 10

7. Which of the following expression is correct for radiation efficiency?

\(\eta_r=\frac{R_r}{R_r-R_l}\)

\(\eta_r=\frac{R_r}{R_r+R_l}\)

\(\eta_r=\frac{R_r}{R_l}\)

\(\eta_r=\frac{R_l}{R_r+R_l}\)

Question 7 of 10

Question 8 of 10

8. Fresnel zone is also called as ____

Near Field

Reactive Field

Far Field

Electrostatic Field

Question 8 of 10

Question 9 of 10

9. Power radiated by half-wave dipole with maximum current amplitude 10A is ______

3.65kΩ

0.365kΩ

3.650Ω

36.50Ω

Question 9 of 10

Question 10 of 10

10. The radiation efficiency for antenna having radiation resistance 36.15Ω and loss resistance 0.85Ω is given by ________

0.977

0.997

0.799

0.779

Question 10 of 10