EDC CAT - 3 EXAM

What is the term for the electromagnetic field between the acceptor and donor ions in a PN junction when there is no external voltage applied?

• Peak

• Barrier

• Base

• Path

In a PN junction, the charges on both sides of the electric field barrier are due to these charges

• Majority carriers

• Minority carriers

• Both (a) and (b)

• Fixed ions and mobile ions

What happens to a negative bias PN junction?

• Increases when negative bias increases

• Decreases when negative bias increases

• Increases when negative bias decreases

• Is very low

In a non-degenerate PN junction

• Current in the junction occurs only due to a small number of carriers

• The current in the junction is zero when in equilibrium, because equal but opposite carriers cross the junction

• The current in the junction decreases with an increase in temperature

• The current in the junction is zero when in equilibrium, because charges do not cross the junction

In a PN junction diode, the reverse bias can have

• Some milliamperes

• Between 0.2 A and 15 A

• Some amperes

• Some micro or nano amperes

When the PN junction is in the forward bias, what happens when the battery voltage increases?

• Resistance increases

• Current increases in the PN junction

• Current decreases in the PN junction

• None of the above occurs

What happens when a PN junction is under reverse bias?

• Holes and electrons tend to concentrate near the junction

• The barrier breaks down

• Holes and electrons tend to move away from the junction

• None of the above

In a PN junction, when the applied voltage ........ exceeds the potential, the diode current becomes significant, this is called .............

• forward, reverse voltage

• reverse, reverse voltage

• resistance, reverse voltage

• barrier, forward voltage

When a PN junction is under forward bias voltage

• The positive terminal of the battery is connected to the P-side and the negative terminal is connected to the N-side

• The junction is connected to the ground

• The N-side is directly connected to the P-side

• The positive terminal of the battery is connected to the N-side and the negative terminal is connected to the P-side

A PN connection

• There is low resistance in both forward and reverse directions

• There is high resistance in both forward and reverse directions

• Works only in the forward direction

• Works only in the reverse direction