HIGHLIGHTED-Microwave-Communications.pdf

Its average power is a 10000 watts b 100 watts c 1000

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Its average power is A. 10,000 watts B. 100 watts C. 1,000 watts D. 1,000,000 watts 42. 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 43. 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 44. 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 45. A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar
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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 46. 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 47. It is possible to increase the maximum range of a radar equipment by A. Lowering the pulse frequency B. Raising the peak power of the transmitter C. Narrowing the beam width and increasing the pulse duration D. All of these 48. 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 49. Which of the following is used as a high power microwave oscillator? A. Thyratron B. Magnetron C. Klystron D. Reflex-klystron 50. 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 51. Which ferrite device can be used instead of a duplexer to isolate a microwave transmitter and receiver when both are connected to the same antenna? A. Isolator B. Magnetron C. Simplex D. Circulator 52. The pulse frequency is equal to A. Duty cycle/pulse width B. The reciprocal of the pulse repetition rate C. Pulse width x peak power/average power D. All of these 53. In a radar set, a blocking oscillator can be used to A. Act as the local oscillator converter stage B. Provide the sweep voltage for the PPI tube C. Produce a trigger pulse for the transmitter D. As a single local oscillator converter stage 54. The intensity of the echoes (target definition) on a PPI display is determined by the A. Radio frequency B. Pulse frequency and antenna rotation rate C. Duty cycle D. Average power 55. A duplexer circuit allows a transmitter and a
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