Q.1
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
Q.2
The Gunn diode oscillator
Q.3
The resonant frequency of a cavity resonator depends upon
Q.4
In microwave transmission using digital radio, what causes most intersymbol interference?
Q.5
A traveling-wave tube (TWT) amplifies by virtue of
Q.6
Calculate the effective earth’s radius if the surface refractivity is 301.
Q.7
Which of the following operating frequencies is used for the modern loran navigational system?
Q.8
The maximum usable range of the usual radar set (on any particular range setting) is determined by
Q.9
In a radar-set receiver, the usual mixer stage is
Q.10
Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.
Q.11
The cavity resonator
Q.12
What ferrite device can be used instead of duplexer of isolate microwave transmitter and receiver when both are connected to the same antenna?
Q.13
A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is
Q.14
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
Q.15
What do you call an attenuation that occurs over many different wavelengths of the carrier?
Q.16
Microwave frequencies are normally regarded as those in the range of
Q.17
Klystron oscillators are most often used in the frequency range of
Q.18
In an SHF pulsed radar set, a reflex klystron can be used as a
Q.19
To achieve good bearing resolution when using a pulsed-radar set, an important requirement is
Q.20
A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)
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