HIGHLIGHTED-Microwave-Communications.pdf

A amplitude b phase c frequency d duty cycle 111 the

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A. Amplitude B. Phase C. Frequency D. Duty cycle 111. The most widely used radar transmitter component is a A. Klystron B. Magnetron C. TWT D. Power transistor 112. Low-power radar transmitters and receivers use which component? A. GaAs FET B. Magnetron C. Gunn diode D. Klystron 113. What component in a duplexer protects the receiver from the higher transmitter output? A. Waveguide B. Bandpass filter C. Notch filter D. Spark gap 114. Most radar antennas use a A. Dipole B. Broadside array C. Horn and parabolic reflector D. Collinear array 115. The most common radar display is the A. A scan B. Color CRT C. LCD D. PPI 116. A radar antenna using multiple diploes or slot antennas in a matrix with variable phase shifters is called a/an A. A scan B. Phased array C. Broadside D. Circulator polarized array 117. Which of the following is a typical radar operating frequency? A. 60 MHz B. 450 MHz C. 900 MHz D. 10 GHz
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118. A microwave system requires the use of repeaters when A. The intervening terrain is favorable B. The distances involve are grater C. The required reliability is meet D. The radio fading is unacceptable 119. Are transmission lines which convey electromagnetic waves in highest frequencies A. Twister pair of telephone wires B. Waveguides C. Power lines D. Coaxial cables 120. A microwave band of 10.9 to 36. GHz is considered as A. C-band B. X-band C. Q-band D. K-band 121. A microwave communications system space loss calculation formula. A. 94.2 + 20 log f + 20 log d B. 92.4 + 20 log f + 20 log d C. 94.2 + 10 log f + 20 log d D. 92.3 + 10 log f + 20 log d 122. A waveguide is also a A. Low pass filter B. High pass filter C. Band pass filter D. Band stop filter 123. A method of diversity reception where the signal is transmitted on two difference frequencies over the same path A. Space diversity B. Frequency diversity C. Polarization diversity D. Wavelength diversity 124. A wire used to reduce the skin effect A. AWG # 14 B. AWG # 15 C. Copper wire D. Litz wire 125. Space diversity transmission means transmitting and receiving on two or more. A. Different frequencies B. Antennas operating on two different frequencies C. Antennas operating on the same frequencies D. Identical frequencies 126. The best system configuration to overcome multipath fading of microwave system over the water A. Space diversity B. Frequency diversity C. Polarization diversity D. Wavelength diversity 127. When the value of k increases, the effective result is _______ of the equivalent curvature A. Flattening B. Bulging C. Sharp curvature D. All of these 128. A traveling wave tube consists of A. Electron gun, helix and repeller B. Electron gun, helix and collector C. Electron gun, repeller and collector D. Buncher cavity and catcher cavity 129. Advantage of periscope antenna in microwave A. Reduce tower height B. Minimize interference to and from other
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