HIGHLIGHTED-Microwave-Communications.pdf

A 000025 b 99975 c 025 d 00975 519 what would be the

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a. 0.00025 b. 99.975% c. 0.25 % d. 00.975% 519. What would be the ERP, in watts if the transmitter output is 30 dBm and the transmission line loss is 20 dB and the antenna connected to it has a power gain of 60 dB? a. 10,000 watts b. 1000 watts c. 100 watts d. 10 watts 520. Also referred to as the Transferred Electron Device a. Magnetron b. TWT c. Gunn diode d. APD 521. Also known as the Esaki diode a. Gunn b. Tunnel c. IMPATT d. PIN diode 522. The following are negative resistance amplifiers except a. Tunnel b. Gunn c. IMPATT d. PIN diode
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523. Regarded as the oldest semiconductor device a. Shottky Barrier diode b. PIN diode c. Point contact diode d. Triode 524. Also called the hot electron diode a. PIN diode b. ESBAR c. APD d. Gunn diode 525. Also called tunnel rectifiers a. Backward diode b. Schottky barrier diode c. APD d. PIN diode 526. Varactors are variable __________ diode. a. Reactance b. Capacitance c. Inductance d. Resistance 527. Diodes designed to store energy in their capacitance during forward bias and generates harmonics in the reverse bias. a. Step recovery b. Gunn c. APD d. IMPATT 528. A cross between the TWT and the magnetron in its operation a. CFA b. BWO c. EIA d. Twystron 529. The following are parts of a multicavity klystron except a. Buncher cavity b. Catcher cavity c. Cathode d. Attenuator 530. The very first microwave transistors a. GaAs FET b. Si BJT c. MIC d. NOTA 531. The most common microwave FET which is also known as the MESFET a. Dual GaAs FET b. Si BJT c. MIC d. Schottky Barrier Gate 532. It looks like a shorter, thicker TWT a. CFA b. BWO c. EIA d. Twystron 533. A Twystron is a hybrid combination of a. TWT and Magnetron b. TWT and Klystron c. TWT and Ubitron d. TWT and gyrotron 534. A multicavity klystron with interconnected multigap cavities a. TWT b. Twystron c. EIA d. Gyrotron 535. SAW propagate in a. GaAs b. InP c. Stripline d. Quartz crystal 536. The output from a laser is monochromatic; this means that it is
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a. Infrared b. Narrow beam c. Polarized d. Single frequency 537. The ruby laser differs from the ruby maser in that the former a. Does not require pumping b. Needs no resonator c. Is an oscillator d. Produces much lower powers 538. The transmission system using two ground planes a. Microstrip b. Elliptical waveguide c. Parallel wire line d. Stripline 539. A BWO is based on the a. Rising sun magnetron b. CFA c. Coaxial magnetron d. TWT 540. One of the following is unlikely to be used as a pulsed device a. Multicavity klystron b. BWO c. CFA d. TWT 541. A microwave tube amplifier uses an axial magnetic field and a radial electric field a. Reflex klystron b. Coaxial magnetron c. TW magnetron d. CFA 542. The attenuator is used in the TWT to a. Help bunching b. Prevent oscillation c. Prevent saturation d. Increase gain 543. The glass tube of a TWT may be coated with aquadag to a. Help focusing b. Provide attenuation c. Improve bunching d. Increase gain 544. The cavity magnetron uses strapping to a. Prevent mode jumping b. Prevent cathode back heating c. Ensure bunching d. Improve the phase focusing effect 545. Compared with equivalent transmission lines, 3-GHz waveguides (indicate false statement) a. Are less lossy b. Can carry higher powers c. Are less bulky d. Have lower attenuation 546. Indicate the false statement. When the free-
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