Textbook assignment: Chapter 1, Introduction to Electron Tubes, pages 1-1 through 1-55.
1-1. The electrons emitted by a heated
conductor come from what source?
1. An external battery
2. An external ac source
3. Both 1 and 2 above
4. The conductor itself
1-2. What is another name for thermionic
1. The gap effect
2. The heat effect
3. The Edison effect
4. The Fleming effect
1-3. Electrons emitted by a hot filament are
able to cross the gap between the
filament and the plate. What force
enables them to do this?
1. Magnetic repulsion
2. Inductive reactance
3. Thermionic emission
4. Electrostatic attraction
1-4. Name the two series circuits that are
associated with a diode electron tube.
1. The plate and anode circuits
2. The plate and filament circuits
3. The battery and filament circuits
4. The filament and cathode circuits
1-5. When an ac voltage is applied across the
plate and filament of a diode, the current
measured will represent what type of
1. Pulsating dc
3. Pulsating ac
1-6. A filament that uses a one-molecule-
thick layer of barium and strontium is
classified as what type of filament?
1-7. Which of the following ac filament
voltages is most likely to be considered
a common voltage?
1. 1.5 volts
2. 3.0 volts
3. 6.3 volts
4. 9.0 volts
1-8. An ac directly heated filament has
which of the following advantages?
1. Even spacing relative to the plate
2. Even emission across the filament
3. Constant emission throughout the ac
4. Rapid heating effect
1-9. An indirectly heated cathode always
uses what material for its emitting
1. An oxide coating
2. A thorium coating
3. A tungsten coating
4. A graphite coating