Microwave Communication What is the purpose of the electromagnetic field which surrounds a traveling-wave tube? To keep the electrons from spreading out To slow down the signal on the helix To velocity modulate the electron beam To accelerate the electron To keep the electrons from spreading out To slow down the signal on the helix To velocity modulate the electron beam To accelerate the electron ANSWER DOWNLOAD EXAMIANS APP
Microwave Communication In a pulsed radar set, the STC circuit is used to Vary the pulse frequency in order to control the maximum target Reduce interference from the effects of sea return Increases receiver sensitivity for echoes from targets Improve the target bearing resolution Vary the pulse frequency in order to control the maximum target Reduce interference from the effects of sea return Increases receiver sensitivity for echoes from targets Improve the target bearing resolution ANSWER DOWNLOAD EXAMIANS APP
Microwave Communication Which of the following is used as a high power microwave oscillator? Klystron Thyratron Magnetron Reflex-klystron Klystron Thyratron Magnetron Reflex-klystron ANSWER DOWNLOAD EXAMIANS APP
Microwave Communication The main frequency determining element of a klystron is Its mode of operation The accelerating voltage Its resonant cavity The repeller voltage Its mode of operation The accelerating voltage Its resonant cavity The repeller voltage ANSWER DOWNLOAD EXAMIANS APP
Microwave Communication The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m) S = 2λR/L S = 3λR/L S = λR/L S = λR/RL S = 2λR/L S = 3λR/L S = λR/L S = λR/RL ANSWER DOWNLOAD EXAMIANS APP
Microwave Communication What do you call an attenuation that occurs over many different wavelengths of the carrier? Rayleigh fading Slow fading Wavelength fading Rician fading Rayleigh fading Slow fading Wavelength fading Rician fading ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS