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Here is the "Electricity - Basic Navy Training Courses" (NAVPERS 10622) in its entirety. It should provide one of the Internet's best resources for people seeking a basic electricity course - complete with examples worked out. See copyright. See Table of Contents.   • U.S. Government Printing Office; 1945 - 618779

 

Chapter 19 Quiz

Vacuum Tubes

1. In thermionic emission, why do electrons shoot off the metal surface?

2. Why is the air removed from a vacuum tube?

3. Why is the cathode negative regardless of battery connection?

4. Why does current never flow from plate to cathode?

5. How does a diode act as a rectifier?

6. How does the grid control current in a triode?

7. Why must the grid be biased negatively?

8. How does a triode amplify signals?

 

(Answers below)

 

Return to Chapter 19

 

 

 

 

 

 

 

 

 

 

 

 

 

Chapter 19 ANSWERS

Vacuum Tubes

1. The heat increases the electrons speed so that proton attraction can no longer hold them.

2. The air molecules would clog up the space around the cathode. They would interfere with the emission of electrons.

3. The space charge of electrons determine the cathode polarity. Electrons are negative so the cathode is negative.

4. Because the plate has no electrons emitted to make up a current from plate to cathode.

5. The diode only passes current from cathode to plate. When the plate is negative no current can flow. Therefore, only the current in the cathode to plate direction is passed.

6. The grid acts as a valve between cathode and plate. The negativeness of the grid controls the amount of current that can pass to the plate.

7. The grid would lose control if it became positive. Therefore, a negative bias prevents the grid ever becoming positive and losing control.

8. The cathode to plate current is strong. But this current is controlled by very small charges in grid potential.

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