| 1. | Which principle of operation of cavity wavemeters is used in microwave networks ? | |
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Phase shift
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Gyration
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Resonance
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Polarization shift
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Report Question| 2. | In the terrestrial paths of a microwave communication system, which technique is usually adopted to overcome signal loss due to earth's curvature ? | |
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Link repeaters are arranged with 500 km apart
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Link repeaters are arranged with 50 km apart
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Phase correctors are located in every 2 km apart
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Signal amplifiers are arranged in every 5 km apart
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| 3. | Which one of the following statements is correct Microwave link repeaters are typically 50 km apart ? | |
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because of output tube power limitations
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because of atmospheric attenuation
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to ensure that the applied de voltage is not excessive
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because of earth's curvature
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| 4. | While determining antenna height for terrestrial microwaves links, the effect of refraction from the atmosphere is taken care of by considering the effective curvature of the earth to be ? | |
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2/3 times the radius of the earth
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4/3 times the radius of the earth
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3/2 times the radius of the earth
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3/4 times the radius of the earth
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| 5. | In microwave communication, sometime, microwave signals reach large distances by following the Earth's curvature. This phenomenon is called ? | |
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Faraday effect
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ducting
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ionospheric reflection
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tropospheric scatter
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| 6. | A travelling wave magnetron having N resonators with adjacent resonators tightly coupled has possible modes of resonance ? | |
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N
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(2N-1)
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(2N+1)
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N/2
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| 7. | For high power microwave industry, power is generated by ? | |
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PIN diode
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IMPATT
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Magnetron
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Gunn diode
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| 8. | Consider the following statements in case of a magic Tee: 1. The collinear arms are isolated from each other. 2. One of the collinear arms is isolated from E-arm. 3. One of the collinear arms is isolated from H-arm. 4. E and H arms are isolated from each other. Which of these statements are correct ? | |
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1 and 4
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2 and 3
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1 and 2
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3 and 4
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| 9. | Which one of the following statements in not true for strip line when compared to a waveguide ? | |
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Losses are less
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It has a smaller bandwidth
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It is much smaller in size
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It can be directly connected to semiconductor microwave devices
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| 10. | In a circular waveguide with radius 'r', the dominant mode is ? | |
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TE01
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TM11
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TE11
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TM01
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