electronics-and-communication-engineering-microwave-communication Related Question Answers

101. The semiconductor diode which can be used in switching circuit in microwave range is





102. In the given figure the reflected current wave after first reflection is





103. A line has an attenuation of 0.054 Np/m. The attenuation in decibels is





104. If a line is open circuited Zin = Z0 tanh (gl).



105. A reflex klystron oscillator uses





106. A coaxial RF cable has a characteristic impedance of 50 Ω and C equal to 40 pF/m. The inductance is





107. Where is the headquarters of SEATO?





108. In a multicavity klystron amplifier the signal to be amplified develops an ac voltage of signal frequency across the gap in buncher cavity



109. If VSWR is infinite, the transmission line is terminated in





110. In a circular waveguide TE21 mode has lowest cutoff frequency



111. The number of TV channels which can be accommodated in a spectrum of 300 MHz is about





112. The noise figure of multicavity klystron amplifier is very low



113. Assertion (A): The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.Reason (R): Free space has an intrinsic impedance of 377 ohms.





114. In the given figure the E and H lines in a coaxial cable





115. Roughly the time required for microwave cooking as compared to conventional cooking is





116. If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of





117. Which mode has the lowest cut off frequency in circular wave guides?





118. Assertion (A): Klystron amplifiers use one or more intermediate cavities in addition to buncher and catcher cavity.Reason (R): When one or more intermediate cavities are used the bandwidth can be increased.





119. A wave Em cos (bx - ωt) is a backward wave.



120. A reflex klystron oscillator is a





121. Consider the following applications TV tuningActive filterMicrowave frequency multiplication In which of above can a varactor diode be used?





122. Consider the following statements Dissipative attenuator has a fixed value of attenuation.Reflective attenuator has a fixed value of attenuation.Both dissipative and reflective attenuators are available only with fixed attenuation.Both dissipative and reflective attenuators are available with either fixed or variable attenuation. Which of the above are correct?





123. Power gain of a multicavity klystron amplifier is





124. If a short line is terminated in characteristic impedance it behaves as an infinite line.



125. Ga As exhibits negative differential mobility



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