Antenna and Wave Propagation MCQs Quiz Multiple Choice Questions & Answers

1. Antennas convert

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

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

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

3. Which of the following is true

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

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

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

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

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

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

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

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

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

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

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

9. Directivity is inversely proportional to………

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

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

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

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

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

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

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

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

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

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

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

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

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

16. Antenna aperture is same as ..............

1. Area
2. volume
3. Length
4. width

17. The source of scalar potential is

1. Both a and b
2. none
3. Charge density
4. Current density

18. The source of vector potential is

1. Both a and b
2. none
3. Charge density
4. Current density

19. R/v is called ..............

1. Propagation delay
2. none
3. Radiation to voltage ratio
4. resistance to velocity ratio

20. Which condition makes coupled equations into uncoupled equations

1. Lorentz gauge
2. none
3. Retarded
4. Helmholtz

21. Alternating current element is given by

1. I dl sin?t
2. I
3. I dl
4. I dl cos?t

22. .............. potential is used to find the field components of current element

1. Both a and b
2. None
3. Scalar Potential, V
4. Vector Potential, A