Why is the control grid of a tube always held at negative potential W.R.T cathode.?

What would be the gain of a negative feedback amplifier with an internal gain A=100 and a feedback factor m=0.9?

Tuned amplifiers are used for the amplification of _____.

Which one is used to provide current in vacuum tubes?

Vacuum tubes are _____.

When a transistor is driven to saturation, ideally, the Vce is _____.

What does 'doping' do?

When silicon has been doped, what does this mean?

Diodes and most photovoltaic cells contain which feature?

What mathematical formula most accurately predicts the Fermi level of a semiconductor?

What is the only p-type dopant used in silicon device manufacturing?