The coarse frequency adjustment of a reflex klystron is accomplished by Adjusting the flexible wall of the resonant cavity Varying the repeller voltage An adjustment in the synchronizer The AFC system TRUE ANSWER : ? YOUR ANSWER : ?
In microwave transmission using digital radio, what causes most intersymbol interference? Random Doppler shift Rayleigh fading Slow fading Delayed spreading TRUE ANSWER : ? YOUR ANSWER : ?
The aquadag coating on the inside of PPI tube is used As a second anode and to prevent the build-up of secondary field To shield the electron beam from unidirectional magnetic To focus the beam of primary electrons All of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the reception problems below that is not due to multipath? Random Doppler shift Slow fading Delayed spreading Rayleigh fading TRUE ANSWER : ? YOUR ANSWER : ?
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target. Which may be used to tune the radar receiver Which may be used to tune the radar synchronizer Tune the magnetron to the correct frequency To the tone of the pulse repetition TRUE ANSWER : ? YOUR ANSWER : ?
What allow microwave to pass in only one direction? RF emitter Ferrite emitter Varactor-triac Capacitor TRUE ANSWER : ? YOUR ANSWER : ?
A PPI cathode-ray tube as used on a radar set Is used to check the percentage of modulation Indicates only the range of a target Indicates both the range and azimuth of a target Is used for receiver alignment TRUE ANSWER : ? YOUR ANSWER : ?
The cavity resonator Produces a frequency which is independent of the cavity size. Is equivalent to an LC resonant circuit Has a low Q factor for narrow operation. In a reflect klystron has its output taken from the reflector plate TRUE ANSWER : ? YOUR ANSWER : ?
The maximum usable range of the usual radar set (on any particular range setting) is determined by The interval between transmitted pulses The bandwidth of the receiver IF stages The duty cycle The width of the transmitted pulses TRUE ANSWER : ? YOUR ANSWER : ?
A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B) All of these May be tested during the first five minutes of any hour Must be capable of floating or being secured to a survival Must have its battery replaced after emergency use TRUE ANSWER : ? YOUR ANSWER : ?