Microwave Tubes

Microwave tubes are grouped into two categories depending on the type of:

• Electron beam and field interaction

• Amplification method

• Power gain achieved

• Construction methods

Reflex Klystron is a

• Low Power Generator

• High Power Generator

• Low Gain Amplifier

• Not an Oscillator

A major disadvantage of klystron amplifier is:

• Low power gain

• Low bandwidth

• High source power

• Design complexity

What is the preferred magnetron mode of operation?

• Circular mode

• Rectangular mode

• σ mode

• π mode

Both axial magnetic field and radial electric fields are used in the following vacuum tube

• magnetron

• a reflex klystron

• multi cavity Klystron

• traveling-wave tube

The power that can be produced by a magnetron depends on its ________

• size

• efficiency

• output

• speed

The production of power at higher frequencies is much simpler than production of power at low frequencies.

• True

• False

In the following microwave tubes, RF energy travels at nearly the same speed as the electrons that are traveling from the cathode to the collector:

• Magnetron

• TWT

• CFA

• Klystron

Magnetrons are microwave devices that offer very high efficiencies of about 80%.

• True

• False

Tuning in Reflex klystron is done by using--------

• Connector

• Attenuator

• SS tuner

• Short circuit plunger