MCQ for Diode operation and VI characteristics

In a PN junction with no external voltage, the electric field between acceptor and donor ions is called a

• Peak

• Barrier

• Threshold

• Path

In a PN junction the potential barrier is due to the charges on either side of the junction, these charges are

• Majority carriers

• Minority carriers

• Both (a) and (b)

• Fixed donor and acceptor ions

In an unbiased PN junction

• The junction current is due to minority carriers only

• The junction current at equilibrium is zero as equal but opposite carriers are crossing the junction

• The junction current reduces with rise in temperature

• The junction current at equilibrium is zero as charges do not cross the junction

For a PN junction diode, the current in reverse bias may be

• Few miliamperes

• Between 0.2 A and 15 A

• Few amperes

• Few micro or nano amperes

When PN junction is in forward bias, by increasing the battery voltage

• Circuit resistance increases

• Current through P-N junction increases

• Current through P-N junction decreases

• None of the above happens

When a PN junction is reverse-biased

• Holes and electrons tend to concentrate towards the junction

• The barrier tends to break down

• Holes and electrons tend to move away from the junction

• None of the above

In a PN junction when the applied voltage overcomes the ........ potential, the diode current is large, which is known as .............

• Depletion, negative bias

• Reverse, reverse bias

• Resistance, reverse bias

• Barrier, forward bias

A PN junction is said to be forward biased when

• .Positive terminal of the battery is connected to P-side and the negative side to the N-side

• Junction is earthed

• N-side is connected directly to the p-side

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

A PN junction

• Has low resistance in forward as well as reverse directions

• Has high resistance in forward as well as reverse directions

• Conducts in forward direction only

• Conducts in reverse direction only

A PN junction is formed in a process which may be of

• Diffused type

• Alloyed type

• The grown type

• Any of the above