18 Questions
Who developed the 1st vacuum in 1904?
John Ambrose Fleming
What does a Fleming Diode do?
Allows electric current flow in one direction
What is the main function of a cathode in a vacuum tube?
Emits free electrons
Why are vacuum tubes considered advantageous?
They can work at high temps without damage
What is the primary disadvantage of vacuum tubes compared to semiconductor devices?
Size - they are huge compared to semiconductor devices
In which year did Lee De Forest invent the vacuum tube?
1906
What is the simplest form of vacuum tube?
Vacuum diode
Which vacuum tube has 3 electrodes, including a control grid?
Vacuum triode
Who invented the tetrode vacuum tube in 1926?
Albert Wallace Hui
What is the purpose of the screen grid in a vacuum tetrode?
To act as an electrostatic shield
Which vacuum tube has a suppressor grid placed between the screen grid and plate?
Vacuum pentode
What does the control grid do in a vacuum tube?
Controls the flow of electrons between cathode and anode
What is the function of the suppressor grid in a gas-filled tube?
Acts as a negatively charged electrode
What happens when an N-type material is fused with a P-type material?
Formation of a PN Junction
What is the role of acceptor ions in the P-type material along the PN junction?
Attracting holes
What creates a potential barrier zone around the PN junction?
Repulsion of holes by donor atoms
How does a gas-filled tube operate?
By ionizing the gas with an applied voltage
What is the purpose of the depletion layer in a semiconductor diode?
To create a potential barrier zone around the junction
Test your knowledge on the concepts of vacuum, gas flow conductance, and viscous flow in physics. Learn about the properties of vacuum, gas molecules flow through confined spaces, and momentum transfer between molecules.
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