10
2-9. The point in a stream of electron bunches
at which the catcher cavity will most
efficiently remove power is determined
by which of the following factors?
1. Electron spin velocity
2. The size of the cavity
3. The size of the bunches
4. Frequency of the buncher-grid signal
2-10. Which of the following electronic
interactions is used in klystron operation?
1. Velocity-modulation
2. Voltage and current
3. Variable-capacitance
4. Crossed electromagnetic-field
2-11. In a klystron, an ac potential is
superimposed on the dc voltage that is
applied to the buncher grids by what
component?
1. The cathode
2. The accelerator grid
3. The buncher-grid cavity resonator
4. The catcher-grid cavity resonator
2-12. A two-cavity klystron that has a feedback
path from the catcher cavity to the
buncher cavity will operate as what type
of circuit?
1. Modulator
2. Amplifier
3. Oscillator
4. Discriminator
2-13. The input signal to a two-cavity klystron
amplifier is applied to which of the
following components?
1. The cathode
2. The catcher grids
3. The buncher grids
4. The accelerator grid
2-14. In a klystron, the placement of additional
cavities between the buncher cavity and
catcher cavity increases the power output
by causing which of the following
electronic actions?
1. Increased velocity modulation
2. Decreased velocity modulation
3. Increased electron-beam speed
4. Decreased electron-beam speed
2-15. What is the purpose of applying a large
negative pulse to the cathode of a three-
cavity klystron?
1. To focus the electron beam
2. To accelerate the electron beam
3. To decelerate the electron beam
4. To modulate the electron beam
2-16. In a three-cavity klystron, what cavity, if
any, contributes most to the velocity
modulation of the electron beam?
1. The middle cavity
2. The catcher cavity
3. The buncher cavity
4. None
2-17. The bandwidth of a multicavity klystron
can be increased by using which of the
following tuning methods?
1. Varactor tuning
2. Staggered tuning
3. Electronic tuning
4. Synchronous tuning
2-18. The repeller of a reflex klystron replaces
what component in other types of
klystrons?
1. The input cavity
2. The output cavity
3. The buncher cavity
4. The intermediate cavity
