The maximum usable range of the usual radar set (on any particular range setting) is determined by The width of the transmitted pulses The interval between transmitted pulses The bandwidth of the receiver IF stages The duty cycle TRUE ANSWER : ? YOUR ANSWER : ?
The aquadag coating on the inside of PPI tube is used To shield the electron beam from unidirectional magnetic As a second anode and to prevent the build-up of secondary field To focus the beam of primary electrons All of these TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is used as an oscillator device in the SHF band? Klystron tube Thyratron tube Both B and C Tunnel diode TRUE ANSWER : ? YOUR ANSWER : ?
The main frequency determining element of a klystron is The accelerating voltage Its mode of operation The repeller voltage Its resonant cavity TRUE ANSWER : ? YOUR ANSWER : ?
If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers Must be doubled Must remain as before May be decreased Must be increased TRUE ANSWER : ? YOUR ANSWER : ?
Calculate the effective earth’s radius if the surface refractivity is 301. 6370 km 6370 mi 8493 mmi 8493 km TRUE ANSWER : ? YOUR ANSWER : ?
In an SHF pulsed radar set, a reflex klystron can be used as a Local oscillator Duplexer stage Single mixer stage Transmitter oscillator TRUE ANSWER : ? YOUR ANSWER : ?
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube? To slow down the signal on the helix To keep the electrons from spreading out To velocity modulate the electron beam To accelerate the electron TRUE ANSWER : ? YOUR ANSWER : ?
A traveling-wave tube (TWT) amplifies by virtue of The absorption of energy by the signal from an electron stream The effect of an external magnetic field The energy liberated form the collector The energy contained the cavity resonators TRUE ANSWER : ? YOUR ANSWER : ?
In a radar-set receiver, the usual mixer stage is A tunnel diode A silicon crystal And FET A Rochelle salts crystal TRUE ANSWER : ? YOUR ANSWER : ?