1.What are extrinsic semiconductors?
An Extrinsic Semiconductor is a semiconductor material doped by a specific impurity, which is able to modify its electrical properties,making it suitable for electronic applications with specific purposes. An extrinsic semiconductor may be of P type with holes as majority charge carriers or of N type with electrons as majority charge carriers.
2. What is a Crystal Diode?
A crystal diode is made by making a cat whisker metal wire tip in contact with a silicon or germanium crystal under pressure. During the manufacture of the point contact diode, a relatively large current is passed from the cat whisker to the silicon crystal. The result of this large current is the formation of a small region of p-type material around the crystal in the vicinity of the point contact.Thus, a PN-junction is formed which behaves in the same ways a normal PN-junction.3.
3. Define Ripple Factor
Ripple factor of a rectifier is defined as the ratio of the root mean square value of AC component of the output to the average DC component of the output.
4. Define Current Gain of a CC Amplifier
Common collector current gain is defined as the ratio between emitter current and base current in common collector configuration.
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5. Define Operating Point of a Transistor
The operating point of a transistor, also known as bias point, quiescent point, Q-point, is the steady-state (DC) voltage or current at a specified terminal of the transistor with no input signal applied.
