Top 80+ Solved Antennas and Microwave Engineering MCQ Questions Answer
Q. The antenna in which location of the feed determines the direction of the lobe are:
a. wire antenna
b. loop antenna
c. helical antenna
d. horn antenna
Q. The klystron tube used in a klystron amplifier is a type beam amplifier.
a. linear beam
b. crossed field
c. parallel field
d. none of the mentioned
Q. Colpitts oscillator operating at 50 MHz has an inductor in the feedback section of value 0.10µH. then the values of the capacitors in the feedback section is:
a. 100 pf, 100 pf
b. 100 pf, 50 pf
c. 70 pf, 130 pf
d. 80 pf, 60 pf
Q. Hartley oscillator has inductance values of 12 mH and 4 mH in the feedback section and a capacitor of 4 nF. Then the resonant frequency of the circuit is:
a. 19.89 khz
b. 25 khz
c. 45 khz
d. 12 khz
Q. Colpitts oscillator in the feedback section has an inductance of 4 mH and capacitors of 12 nH and 4 nH. Then the resonant frequency of Colpitts oscillator is:
a. 50.4 khz
b. 35.1 khz
c. 45.9 khz
d. none of the mentioned
Q. Any device with negative impedance as its characteristic property can be called:
a. energy source
b. energy sink
c. oscillator
d. none of the mentioned
Q. Dipole antennas are an example for:
a. wire antennas
b. aperture antennas
c. array antennas
d. none of the mentioned
Q. antennas consist of a regular arrangement of antenna elements with a feed network
a. aperture antennas
b. array antennas
c. printed antennas
d. wire antennas
Q. Antennas having a constant pattern in the azimuthal plane are called
a. high gain antenna
b. omni directional antenna
c. unidirectional antenna
d. low gain antenna
Q. If the power input to an antenna is 100 mW and if the radiated power is measured to be 90 mW, then the efficiency of the antenna is:
a. 75 %
b. 80 %
c. 90 %
d. insufficient data
Q. Which of the following is false regarding Antenna array?
a. directivity increases
b. directivity decreases
c. beam width decreases
d. gain increases
Q. Electrical size of antenna is increased by which of the following?
a. antenna array
b. decreasing the coverage area
c. increasing the coverage area
d. using a single antenna
Q. For long distance communication, which of the property is mainly necessary for the antenna?
a. high directivity
b. low directivity
c. low gain
d. broad beam width
Q. Which of the following is false about the single antenna for long distance communication?
a. enlarging may create side lobes
b. no side lobes
c. high directivity is required
d. high gain is required