Top 150+ Solved Radiation and Microwave Techniques MCQ Questions Answer
Q. Following waveguide component not easily adjustable for tuning
a. stub
b. iris
c. screw
d. plunger
Q. What is the wavelength of a wave in a waveguide?
a. greater than in free space
b. depends only on the waveguide dimensions and the free-space wavelength
c. inversely proportional to the phase velocity
d. inversely proportional to the group velocity
Q. What is the cut-off frequency of a waveguide?
a. the highest frequency the waveguide operates
b. the lowest frequency the waveguide operates
c. the same as the operating frequency
d. the only frequency the waveguide operates
Q. For reduction in cross sectional dimension, waveguide to use is
a. ridged
b. circular
c. rectangular
d. flexible
Q. Out of following list, is not directional coupler
a. bathe hole
b. two hole
c. rate race
d. magic hole
Q. The condition which will satisfy the dimensions of the waveguide is
a. a = b
b. a>b
c. a<b
d. ab=0
Q. Materials generally preferred for wave guides are
a. brass and aluminium
b. cast iron and steel
c. non-metallic solids including plastics
d. all of the above
Q. A major disadvantage of klystron amplifier is
a. low power gain
b. low bandwidth
c. high source power
d. design complexity
Q. The resistance of the PIN diode with positive bias voltage
a. increases
b. decreases
c. remains constant
d. insufficient data
Q. GaAs is used in the fabrication of GUNN diodes because
a. gaas is cost effective
b. it less temperature sensitive
c. it has low conduction band electrons
d. less forbidden energy gap