P-N junction diodes

The process of increasing the conductivity of a semiconductor by adding small amounts of impurities to a pure semiconductor is called:

• rectification

• amplification

• doping

• filtering

1. Identify the right semiconductor materials required to construct a diode.

• Cathode: P Type, Anode: N Type

• Cathode: N Type, Anode: P Type

• Cathode: P Type, Anode: P Type

• Cathode: N Type, Anode: N Type

1. What is the output voltage for the circuit shown, if D1 and D2 are Silicon diodes, and D3 is a Germanium diode?

• 1.3 V

• 7.3 V

• 7.7 V

• 8.4 V

Which one of the following describes the condition of a rectifier diode when it is reverse biased?

• Offers zero resistance

• Behaves as a short circuit

• Offers high resistance

• Conducts current

For the circuit shown below, the output will be:

• 2 negative peaks per full cycle of input

• 2 Positive peaks per full cycle of input

• Negative peaks for negative half cycles of input

• Positive peaks for positive half cycles of input

• Zero volts

Find the voltage across the Silicon diode in the circuit shown:

• 0 V

• 0.2 V

• 0.7 V

• 5.3 V

A simple diode rectifier circuit can convert:

I. AC voltage to DC voltage

II. DC voltage to AC voltage

III. Small AC voltage to a large AC voltage

• I only

• II only

• III only

• I and II only

• I and III only

The cathode of a diode is made 4V positive of its anode, What is the name of this type of bias?

A Silicon diode has been tested by applying positive voltage on its Anode and Negative voltage on Cathode. What is the expected Resistance?

• Mega Ohms

• 10-20 Ohms

• 10000 Ohms

• Can't be predicted

A diode's Cathode has been made 9V positive as compared to its anode 0V, The diode shows M ohms resistance on the multimeter. Which one of the following statements is true?

• Diode behaves like an open switch and is in reverse bias

• Diode behaves like an open switch and is in forward bias

• Diode behaves like an closed switch and is in reverse bias

• Diode behaves like an closed switch and is in forward bias