Microwave Communication General Knowledge Quiz | Microwave Communication General Knowledge Short Questions & Answers

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Questions
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

Answer: Loran C: 100 kHz
42 Which of the following is used as a high power microwave oscillator?
A Thyratron
B Magnetron
C Klystron
D Reflex-klystron

Answer: Magnetron
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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

Answer: Isolator
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

Answer: May be decreased
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

Answer: 100 watts

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