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Microwave Communication
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Q.1
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
To accelerate the electron
To velocity modulate the electron beam
To keep the electrons from spreading out
To slow down the signal on the helix
Q.2
The Gunn diode oscillator
Is capable of generating continuous microwave power of the order of kilowatt
Generates frequencies which are below 100 MHz
Operates over a positive resistance characteristic
Depends on the formation of charge domain
Q.3
The resonant frequency of a cavity resonator depends upon
The mode of operation
Its electrical dimensions
Its physical dimensions
The capacitor which tunes it
Q.4
In microwave transmission using digital radio, what causes most intersymbol interference?
Delayed spreading
Rayleigh fading
Random Doppler shift
Slow fading
Q.5
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 contained the cavity resonators
The energy liberated form the collector
Q.6
Calculate the effective earth’s radius if the surface refractivity is 301.
8493 km
8493 mmi
6370 km
6370 mi
Q.7
Which of the following operating frequencies is used for the modern loran navigational system?
Loran C: 100 kHz
Loran D: 10.2 kHz
Loran A: 1950 kHz
Loran B: 900 kHz
Q.8
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
Q.9
In a radar-set receiver, the usual mixer stage is
And FET
A tunnel diode
A silicon crystal
A Rochelle salts crystal
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.
Third
Fourth
Fifth
Sixth
Q.11
The cavity resonator
Is equivalent to an LC resonant circuit
In a reflect klystron has its output taken from the reflector plate
Produces a frequency which is independent of the cavity size.
Has a low Q factor for narrow operation.
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?
Isolator
Magnetron
Simplex
Circulator
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
10,000 watts
100 watts
1,000 watts
1,000,000 watts
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
Must remain as before
Must be increased
May be decreased
Must be doubled
Q.15
What do you call an attenuation that occurs over many different wavelengths of the carrier?
Rayleigh fading
Rician fading
Wavelength fading
Slow fading
Q.16
Microwave frequencies are normally regarded as those in the range of
1 to 500 MHz
1000 to 10,000 GHz
1 to 100 GHz
10 to 1000 GHz
Q.17
Klystron oscillators are most often used in the frequency range of
300 to 3000 MHz
3000 to 30000 MHz
30 to 30000 MHz
10 to 10000 MHz
Q.18
In an SHF pulsed radar set, a reflex klystron can be used as a
Single mixer stage
Local oscillator
Transmitter oscillator
Duplexer stage
Q.19
To achieve good bearing resolution when using a pulsed-radar set, an important requirement is
A narrow, antenna-beam width in the vertical plane
A narrow, antenna-beam width in the horizontal plane
A low repetition rate
A high duty cycle
Q.20
A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)
Must be capable of floating or being secured to a survival
Must have its battery replaced after emergency use
May be tested during the first five minutes of any hour
All of these
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