Radiation And Microwave Techniques Set 8

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This set of Radiation and Microwave Techniques Multiple Choice Questions & Answers (MCQs) focuses on Radiation And Microwave Techniques Set 8

Q1 | Which of the following can be used for amplification of microwave energy?
  • magnetron
  • reflex klystron
  • traveling wave tube
  • gunn diode
Q2 | When the electric field applied to GaAs specimen is less than the threshold electricfield, the current in the material:
  • increases linearly
  • decreases linearly
  • increases exponentially
  • decreases exponentially
Q3 | The primary purpose of the helix in a traveling-wave tube is to
  • prevent the electron beam from spreading in the long tube
  • reduce the axial velocity of the rf field
  • ensure broadband operation
  • reduce the noise figure
Q4 | A cavity resonator can be represented by
  • an lc circuit
  • an lcr circuit
  • a lossy inductor
  • a lossy capacitor
Q5 | Ionospheric preparation is not possible for microwaves because
  • microwaves will be fully absorbed by the ionospheric layers
  • there will be an abrupt scattering in all directions
  • microwave will penetrate through the ionospheric layers
  • there will be dispersion of microwave energy
Q6 | Which of the following is not possible in a circular wave guide ?
  • te10
  • te01
  • te11
  • te12
Q7 | The maximum theoretical output circuit efficiency of a double resonator klystronamplifier is
  • 25%
  • 50%
  • 58%
  • 85%
Q8 | The substrate of an MMIC must be a _____________ to accommodate thefabrication of all the type of devices.
  • semiconductor
  • insulator
  • partial conductors
  • metals operable at high frequencies
Q9 | For the capacitors used in MMICs, the insulating dielectric films used are:
  • air
  • sio
  • titanium
  • gaas
Q10 | Processing in MMICs is done by __________
  • ion implantation
  • net list generation
  • floor planning
  • none of the mentioned