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ECE Objective Questions { Antenna }

22. Broadcasting antennas are generally type
A. horizontal
B. vertical
C. either of the above
D. none of the above

23. Parabolic and lens antennas are extensively used for
A. shortwaves
B. microwaves
C. medium frequency waves
D. all of the above

24. The television receiver antennas are usually
A. parabolic dish type
B. helical antennas
C. dipoles
D. none of the above

25. The radiation pattern of parabolic antenna is
A. a figure of eight
B. highly directional
C. omni-directional
D. none of the above

26. The radiation pattern of loop antenna is
A. cardiod
B. circle
C. semi-circle
D. none of the above

27. A helical antenna produces radiation which is
A. circularly-polarised
B. omni-directional
C. either of the above
D. none of the above

28. Regarding Yagi-uda antenna which of the following statements is incorrect?
A. It has a folded dipole as the driven element
B. It has extremely high gain
C. It is often employed as VHF television receiving antenna
D. It is an array consisting of a driven element and parasitic elements arranged collinearly and closely

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