Antenna and Wave Propagation Multiple Choice Questions and Answers

1. Antennas convert

1. Photons to electrons
2. electrons to photons
3. Both a and b
4. none

2. Antennas are of .............. types

1. Two
2. four
3. Infinite
4. none

3. Which of the following is true

1. Time changing current radiates
2. accelerated charges radiates
3. Both a and b
4. none

4. Radiation pattern is .............. dimensional quantity

1. Two
2. three
3. Single
4. none

5. .............. is also called as 3-dB bandwidth

1. FNBW
2. HPBW
3. Both a and b
4. none

6. One steradian is equal to .............. square degrees

1. 360
2. 180
3. 3283
4. 41253

7. .............. is independent of distance

1. Poynting vector
2. radiation intensity
3. Both a and b
4. none

8. The minimum value of the directivity of an antenna is……….

1. Unity
2. zero
3. Infinite
4. none

9. Directivity is inversely proportional to………

1. HPBW
2. FNBW
3. Beam area
4. Beam width

10. Gain is always .............. than directivity

1. Greater
2. lesser
3. Equal to
4. none