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Free download in PDF Microwave Communication General Knowledge Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
Which of the following operating frequencies is used for the modern loran navigational system?
[A]
Loran C: 100 kHz
[B]
Loran D: 10.2 kHz
[C]
Loran A: 1950 kHz
[D]
Loran B: 900 kHz
42
Which of the following is used as a high power microwave oscillator?
[A]
Thyratron
[B]
Magnetron
[C]
Klystron
[D]
Reflex-klystron
43
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have
[A]
A long time constant
[B]
Low-pass filters
[C]
The shortest possible time
[D]
The restricted high-frequency response
Answer: The shortest possible time
44
Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?
[A]
Isolator
[B]
Wave trap
[C]
Tunnel diode
[D]
Circulator
45
A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be
[A]
A decrease in range
[B]
A reduction in horizontal resolution
[C]
No noticeable effect
[D]
A decrease in gain
Answer: No noticeable effect
46
The main frequency determining element of a klystron is
[A]
The repeller voltage
[B]
The accelerating voltage
[C]
Its resonant cavity
[D]
Its mode of operation
Answer: Its resonant cavity
47
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
[A]
Must remain as before
[B]
Must be increased
[C]
May be decreased
[D]
Must be doubled
48
The aquadag coating on the inside of PPI tube is used
[A]
To focus the beam of primary electrons
[B]
To shield the electron beam from unidirectional magnetic
[C]
As a second anode and to prevent the build-up of secondary field
[D]
All of these
Answer: As a second anode and to prevent the build-up of secondary field
49
A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilowatts. Its average power is
[A]
10,000 watts
[B]
100 watts
[C]
1,000 watts
[D]
1,000,000 watts
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