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2-40. In the electron-resonance magnetron, the
total electric field is produced by which
of the following field combinations?
1. The dc field only
2. The ac and dc fields
3. The ac and magnetic fields
4. The dc and magnetic fields
2-41. Energy from working electrons is
received by which of the following
magnetron fields?
1. The ac field only
2. The dc field only
3. Both the ac and dc fields
4. The magnetic field
2-42. In a magnetron, the total action of many
electrons returning to the cathode while
others are moving toward the anode
forms which of the following patterns?
1. Vertical wavefront
2. Space-charge wheel
3. Spherical wavefront
4. Horizontal space charge
2-43. The greatest power output is produced in
what magnetron mode of operation?
1. Mode 1
2. Mode 2
3. The pi mode
4. The radian mode
2-44. Magnetic lines of force passing between
cavities are intercepted in which, if any,
of the following magnetron coupling
methods?
1. Slot coupling method
2. Strap-fed loop method
3. Segment-fed loop method
4. None of the above
2-45. Inductive tuning in a magnetron is
accomplished by which of the following
actions?
1. Changing the cavity resistance
2. Altering the cavity surface-to-volume
ratio
3. Decreasing the size of the slot gap
4. Decreasing the space charge
2-46. A magnetron should be "baked in" under
which of the following conditions?
1. Before each use
2. After periods of idleness
3. After initial installation
4. Both 2 and 3 above
2-47. The crossed-field amplifier produces
which of the following desirable circuit
characteristics?
1. Wide bandwidth
2. High efficiency
3. Large power-handling capability
4. All of the above
2-48. The tunneling action of the tunnel diode
produces which of the following useful
properties?
1. Long transit time
2. Positive resistance
3. Negative resistance
4. Variable inductance
2-49. The tuned circuit in a tunnel-diode
oscillator determines which of the
following circuit values?
1. Frequency
2. Resistance
3. Power range
4. Capacitance
