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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