Microwave frequencies are normally regarded as those in the range of 1 to 100 GHz 10 to 1000 GHz 1000 to 10,000 GHz 1 to 500 MHz TRUE ANSWER : ? YOUR ANSWER : ?
If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the π/4 mode π/2 mode 2π mode π mode TRUE ANSWER : ? YOUR ANSWER : ?
A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor. LORAN Echosounder SONAR Fathometer TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is used as a high power microwave oscillator? Magnetron Reflex-klystron Thyratron Klystron TRUE ANSWER : ? YOUR ANSWER : ?
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have The shortest possible time A long time constant The restricted high-frequency response Low-pass filters TRUE ANSWER : ? YOUR ANSWER : ?
At what position is the input signal inserted into a traveling-wave tube? At the control grid of the electron gun At the collector end of the helix At the cathode end of the helix At the collector TRUE ANSWER : ? YOUR ANSWER : ?
Oscillators of a klystron tube are maintained By feedback between the accelerating grid and the repeller By bunches of electrons passing the cavity grids By circulating bunches of electrons within the cavities. By plate-to-cathode feedback TRUE ANSWER : ? YOUR ANSWER : ?
The coarse frequency adjustment of a reflex klystron is accomplished by Varying the repeller voltage The AFC system Adjusting the flexible wall of the resonant cavity An adjustment in the synchronizer TRUE ANSWER : ? YOUR ANSWER : ?
Calculate the effective earth’s radius if the surface refractivity is 301. 8493 mmi 6370 km 6370 mi 8493 km TRUE ANSWER : ? YOUR ANSWER : ?
In microwave transmission using digital radio, what causes most intersymbol interference? Rayleigh fading Random Doppler shift Delayed spreading Slow fading TRUE ANSWER : ? YOUR ANSWER : ?