MICROWAVE COMMUNICATION QUIZ

Thyratron

Magnetron

Klystron

Reflex-klystron

1000 to 10,000 GHz

1 to 500 MHz

10 to 1000 GHz

1 to 100 GHz

By bunches of electrons passing the cavity grids

By plate-to-cathode feedback

By circulating bunches of electrons within the cavities.

By feedback between the accelerating grid and the repeller

To slow down the signal on the helix

To keep the electrons from spreading out

To accelerate the electron

To velocity modulate the electron beam

May be decreased

Must be increased

Must be doubled

Must remain as before

30 to 30000 MHz

10 to 10000 MHz

300 to 3000 MHz

3000 to 30000 MHz

Waveguide match

All of these

Cavity match

Direct coax-helix match

2π mode

π/2 mode

π/4 mode

π mode

At the control grid of the electron gun

At the cathode end of the helix

At the collector

At the collector end of the helix

As a second anode and to prevent the build-up of secondary field

All of these

To focus the beam of primary electrons

To shield the electron beam from unidirectional magnetic