ELECS 25

When a PN junction is forward biased, what happens to the depletion region?

• The depletion region decreases.

• The depletion region increases.

• The depletion region disappears.

• The depletion region remains the same.

When the reverse bias on a varactor is increased, what happens to the effective capacitance?

• Capacitance increases.

• Capacitance decreases.

• Capacitance remains the same.

• Temperature coefficient increases.

In a reverse biased PN-junction, which current carriers cause leakage current?

• The majority carriers.

• The minority carriers.

• The majority and minority carriers.

• Either the majority or minority carriers.

The action of a PN-junction during breakdown can be explained by what two theories?

• Zener effect and avalanche effect.

• Zener and flywheel effects.

• Avalanche and flywheel effects

• Zener and Miller effects.

Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?

• Miller effect

• Avalanche effect

• Zener effect

• Flywheel effect

The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?

• 32

• 42

• 52

• 62

lf the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?

• 340 V

• 120 V

• 240 V

• 220 V

The suppressor grid is added to a tetrode to reduce what undesirable characteristic of tetrode operation?

• Primary emission

• Secondary emission

• Tertiary emission

• Quaternary emission

What type of bias requires constant current flow through the cathode circuit of a triode?

• Anode biasing

• Fixed biasing

• Cathode biasing

• Self biasing

How are computers classified?

• Technology

• Data they handle

• Purpose

• All of the choices