Advertisements
Advertisements
प्रश्न
Draw the circuit symbol for NPN and PNP transistors. What is the difference in the Emitter, Base, and Collector regions of a transistor?
उत्तर
The circuit symbols of the two types of transistors:
Figure (a)
Figure (b)
The difference in the Emitter (E), the Base (b), and the Collector (C) are as follows:
- Emitter: It is a thick heavily doped layer. This supplies a large number of majority carriers for the current flow through the transistor
- Base: It is the thin, lightly doped central layer.
- Collector: It is a thick and moderately doped layer. Its area is larger than that of the emitter and the base. This layer collects a major portion of the majority of carriers supplied by the emitter. The collector also helps dissipation of any small amount of heat generated.
APPEARS IN
संबंधित प्रश्न
Why are the emitter, the base, and the collector of a BJT doped differently?
In a common-base connection, the emitter current is 6.28 mA and the collector current is 6.20 mA. Determine the common-base DC current gain.
Derive the relation between α and β.
Draw the circuit symbol of the PNP transistor.
The light emitted in an LED is due to
Explain the current flow in an NPN transistor.
What is rectification?
Sketch the static characteristics of a common emitter transistor and bring out the essential features of input and output characteristics.
A transistor of α = 0.99 and VBE = 0.7 V is connected in the common-emitter configuration as shown in the figure. If the transistor is in the saturation region, find the value of collector current.
For a transistor, the current ratio 'βdc' is defined as the ratio of ______.
Least doped region in a transistor ____________.
In the study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98 then the ratio of collector current to base current will be ______.
In switching circuit, transistor is in ON state. Values of IC and IB are 5.2 mA and 10 µA respectively and value of RC is 1 k`Omega`. If Vcc is at 5.5 V, then VCE is ______.
In an npn transistor, the base current is 100 µA and the collector current is 10 mA. The emitter current is ______.
In an npn transistor, the collector current is 24 mA. If 80% of electrons reach collector, its base current in mA is ______.
ln switching circuit, transistor is in ON state and values of IC and IB are 4.2 mA and 5 µA respectively and RC= l k`Omega` and RB= 300 k`Omega`. If VBE = 0.5 V, find the value of VBB.
In a transistor in CE configuration, the ratio of power gain to voltage gain is ____________.
For a common emitter configuration, if 'α' and 'β' have their usual meanings, the correct relationship between 'α' and 'β' is ______.
A pnp transistor is used in common-emitter mode. If a change of 40 µA in base current brings a change of 2 µA in collector current with 0.04 V in base-emitter voltage, then the input resistance is ____________.
The current gain `alpha` of a transistor is 0.95. The change in collector current corresponding to a change of 0.4 mA in the base current in a common emitter arrangement is ______.
In the case of transistor, the relation between current ratios αdc and βdc is ______.
A change of 9.0 mA in the emitter current brings a change of 8.9 mA in the collector current. The value of current gain β will be ______.
For an ideal diode, the current in the following arrangement is ______.
A conducting wire has length 'L1' and diameter 'd1'. After stretching the same wire length becomes 'L2' and diameter 'd2' The ratio of resistances before and after stretching is ______.
The reverse bias in a junction diode is changed from 8V to 13V, then the value of the current changes from 40μA to 60μA. The resistance of junction diode will be ______.
The base current in common emitter mode of the transistor changes by 10 µA. If the current gain of the transistor is 50, then change in collector current is ______.
Explain the output characteristics of common emitter configuration of n-p-n transistor.
Define α.
Define β
