01․ Class B amplifier is biased
Class B Amplifier works only positive cycle of the input signal. Class B Amplifier operation has zero DC bias because zero signal collector current is zero and hence the transistors are biased at the cut-off. So, each transistor only conducts when the input signal is greater than the base emitter voltage (VBE).
02․ In a N-type semiconductor material electrons are ....................
In N-type semiconductor, the conduction is primarily due to electrons and hence electrons are the majority carriers. In N-type extrinsic semiconductor the impurities leaves a free electron, as a result electron becomes majority carriers.
03․ Which process is used for adding impurity into a pure semiconductor material ?
Doping is the process in which impurities are added to a pure semiconductor to increase its conductivity.
04․ Which impurity is added into semiconductor to increase its conductivity ?
To produce extrinsic semiconductor material, a specific amounts of impurity are added to the pure intrinsic semiconductor.
05․ What will be the result if pentavalent impurity is added to pure germanium or silicon ?
If extremely small amount of impurity from pentavalent elements (antimony, phosphorus or arsenic) is added to intrinsic Si or Ge then four of the electrons form covalent bond with the silicon or germanium atom and one electron become free. Due to free electron it become a N-type semiconductor.
06․ In a N-type semiconductor material holes are ......................
In N-type semiconductor, the conduction is primarily due to electrons and hence electrons are majority carriers and holes are the minority carriers.
07․ Which of the following is the pentavalent material ?
Pentavalent elements are antimony, phosphorus or arsenic.
08․ How will be the extrinsic semiconductor act at room temperature ?
In most pure semiconductors at room temperature, the population of thermally excited charge carriers is very small.
09․ Which of the following is trivalent impurity ?
A trivalent impurity are gallium, indium, aluminium or boron.
10․ What is the majority carriers of P type material ?
In a P-type semiconductor holes are majority charge carriers.