Assignment Questions

Neets Module 11-Microwave Principles
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15 2-58. Bulk-effect semiconductors have what primary advantage over normal pn- junction semiconductors? 1. Smaller size 2. Lower frequency 3. Simpler construction 4. Greater power output 2-59. Gallium-arsenide semiconductors begin to exhibit which of the following electrical characteristics at the threshold point? 1. Variable inductance 2. Positive resistance 3. Negative resistance 4. Variable capacitance 2-60. In an avalanche transit-time diode, what causes the dc bias energy previously absorbed by avalanche electrons to be given up to the microwave field? 1. The electron velocity 2. The negative-resistance property 3. The electron transit time 4. The amount of dc bias energy available 2-61. In a point-contact diode, passing a large current from the catwhisker to the silicon crystal produces what region? 1. A domain region 2. A small p region 3. A small n region 4. An avalanche region 2-62. A Schottky barrier diode has which of the following advantages over a point- contact diode? 1. Lower frequency range 2. Higher frequency range 3. Lower noise generation 4. Higher noise generation 2-63. The PIN diode begins acting as a variable resistance at what minimum frequency? 1. 100 megahertz 2. 200 megahertz 3. 300 megahertz 4. 400 megahertz 2-64. Power ratio is a term used to express what property of an antenna? 1. Efficiency 2. Reciprocity 3. Sensitivity 4. Power output 2-65. A standing-wave ratio (swr) describes which of the following quantities? 1. Transmission-to-reception efficiency value 2. The amount of output power 3. The amount of mismatch between a transmission line and its load 4. The amount of characteristic impedance 2-66. Directivity refers to which of the following properties of a radiated beam? 1. Power gain 2. Standing-wave ratio 3. Narrowness of the beam 4. Polarization of the beam 2-67. Surface angular measurements for antenna directivity in radar and communications systems are made in relationship to which of the following references? 1. Vertical plane only 2. Horizontal plane only 3. Horizontal plane and true north 4. Vertical plane and true north

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