Top 250+ Solved Electromagnetic Field MCQ Questions Answer
Q. Antenna tuning is done by changing its___________.
a. Inductive reactances
b. Capacitive reactances
c. Both (a) and (b)
d. None of these
Q. Resonant frequency of an antenna depends upon its___________.
a. Physical length
b. Electrical length
c. None of these
d. Cannot say
Q. Impedance of an antenna is matched to feed___________.
a. Line
b. Radio
c. Both (a) and (b)
d. None of these
Q. Which of the following is a low-gain antenna?
a. Dish antenna on a space craft
b. Wi-Fi antenna
c. Both (a) and (b)
d. None of these
Q. In the case of an ideal isotropic antenna, the geometric radiationpattern is___________.
a. Circle
b. Sphere
c. Parabola
d. Hyperbola
Q. Antenna gain is minimum at radiation pattern___________.
a. Side lobes
b. Back lobes
c. None of these
d. Gain is independent of the radiation pattern
Q. Elliptical polarization can be of___________.
a. Left hand
b. Right hand
c. Either (a) or (b)
d. None of these
Q. Transmitters used on vehicles are__________ polarized.
a. Linearly
b. Circularly
c. Both (a) and (b)
d. None of these
Q. Antenna bandwidth can be increased by using__________.
a. A feed horn
b. Thicker wires
c. Cages
d. All of these
Q. Array factor depends upon__________.
a. Number of elements
b. Spacing among elements
c. Phase of the applied signal
d. All of these
Q. If antenna directivity and antenna gain are equal, then antennaefficiency is __________%.
a. 20
b. 50
c. 75
d. 100
Q. If antenna array elemental spacing is large, then directivity willbe__________.
a. Small
b. More
c. None of these
d. Cannot say
Q. On the basis of the radiation pattern, an antenna array is__________.
a. Broadside
b. End fire
c. Either (a) or (b)
d. None of these