Microwave Communication MCQ Questions & Answers | ECE

A. Waveguide match

B. Cavity match

C. Direct coax-helix match

D. All of the above

A. A long time constant

B. Low-pass filters

C. The shortest possible time

D. The restricted high-frequency response

A. $${\text{S}} = \frac{{2\lambda {\text{R}}}}{{\text{L}}}$$

B. $${\text{S}} = \frac{{3\lambda {\text{R}}}}{{\text{L}}}$$

C. $${\text{S}} = \frac{{\lambda {\text{R}}}}{{\text{L}}}$$

D. $${\text{S}} = \frac{{\text{L}}}{{\lambda {\text{R}}}}$$

A. To focus the beam of primary electrons

B. To shield the electron beam from unidirectional magnetic

C. As a second anode and to prevent the build-up of secondary field

D. All of these

A. RF emitter

B. Capacitor

C. Varactor-triac

D. Ferrite emitter

A. $$\pi $$ mode

B. $$\frac{\pi }{2}$$ mode

C. $$2\pi $$ mode

D. $$\frac{\pi }{4}$$ mode

A. By bunches of electrons passing the cavity grids

B. By plate-to-cathode feedback

C. By feedback between the accelerating grid and the repeller

D. By circulating bunches of electrons within the cavities.

A. Is used to check the percentage of modulation

B. Indicates both the range and azimuth of a target

C. Indicates only the range of a target

D. Is used for receiver alignment

A. Lowering the pulse frequency

B. Raising the peak power of the transmitter

C. Narrowing the beam width and increasing the pulse duration

D. All of these

A. Traveling-wave tube

B. Magnetron

C. Reflex klystron

D. Gunn diode