Antennas Mock Test 2

10%

Question 1 of 10

1. If the radiation resistance of a monopole is 18Ω, then the radiation resistance of a Hertzian dipole is _____________

164Ω

144Ω

124Ω

154Ω

Question 1 of 10

Question 2 of 10

2. What is the Bandwidth of the antenna operating at resonant frequency 200MHz with Quality factor 20?

0.1MHz

10Hz

10MHz

5MHz

Question 2 of 10

Question 3 of 10

3. Friss transmission is applicable when same antenna is used for both transmission and reception.

False

True

Question 3 of 10

Question 4 of 10

4. If the operating frequency increases, powers received by the receiving antenna ______

is not predictable

will decrease

is Independent of frequency

will Increase

Question 4 of 10

Question 5 of 10

5. In which of the following Integral form of Maxwell equations, the surface is closed?

Amperes law

Gauss Law

Faradays Law

Both Amperes and Faraday law

Question 5 of 10

Question 6 of 10

6. If the power radiated by a half wave dipole is 100mW then power radiated by a quarter wave monopole under same current input is _____

50W

50mW

200mW

100mW

Question 6 of 10

Question 7 of 10

7. If the antennas revolution time is 10 sec and 3 dB beam width duration is 150ms then the antenna beam width is _______

54°

1.5°

15°

5.4°

Question 7 of 10

Question 8 of 10

8. If beam efficiency is 0.87 then the stray factor is ____

1.87

0.87

1.30

0.13

Question 8 of 10

Question 9 of 10

9. Which of the following is the Friss transmission equation for the matched polarization of antennas?

\(\frac{P_t}{P_r} = \frac{G_t G_r\lambda^2}{(4πR)^2}\)

\(\frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{(4πR)^2}\)

\(\frac{P_r}{P_t} = \frac{G_t G_r\lambda^2}{4πR^2}\)

\(\frac{P_t}{P_r} = \frac{G_t G_r\lambda^2}{4πR^2}\)

Question 9 of 10

Question 10 of 10

10. For a 4: 1 Balun, what is the unbalanced impedance if the balanced impedance is 2KΩ?

0.5K

Question 10 of 10