Antenna and Wave Propagation MCQ Questions and Answers for Practice

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

11. Directivity and Resolution are ..............

1. Different
2. same
3. Both a and b
4. none

12. Effective aperture is always .............. than Physical aperture.

1. Higher
2. lower
3. Both a and b
4. none

13. .............. Theorem can be applied to both circuit and field theories

1. Equality of patterns
2. Equality of impedance
3. Equality of effective lengths
4. Reciprocity theorem

14. Antenna temperature considers .............. parameter into account

1. Directivity
2. gain
3. Beam area
4. beam efficiency

15. Radiation resistance of antenna is ..............

1. Physical resistance
2. Virtual Resistance
3. Both a and b
4. none