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What can be viva question from the transistor characteristics in common emitter?
Wiki User
∙ 11y ago
1) What is transistor? what are the types of transistors?
Ans: Transistor is a three terminal semiconductor device.
There are two types of semiconductor i.e,. n-p-n and p-n-p.
2) Define n-type and p-type semiconductors.
Ans: If an intrinsic semiconductoris doped with pentavalent impurity. Then it is called n-type semiconductors.
If it is doped with trivalent impurity then it is called p-type semiconductor.
3) What is doping?
Ans: Adding trivalent or pentavalent impurity to an intrinsic semiconductor is called doping.
4. What are three basic transistor connection modes? Which mode is most preferred? Why?
Ans: Common-Emitter, Common-Base & Common-Collector connections.
CE mode is most preferred because CE modes gives Highest voltage gain.
5. Define current amplification factor of a transistor?
Ans: It is defined as ratio of change in collector current to change in base current.
7. What is the biasing rule of transistor?
Ans: Emitter base junction should be forward biased and collector base junction should be reversed biased.
8. What is semiconductor?
Ans: Semiconductor is a substance which has the resistivity in between that of conductor and insulator. semiconductor has negative temperature coefficient of resistance.
9) Which are the commonly used semiconductors?
Ans: Germanium & Silicon
Wiki User
∙ 11y ago
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Why base in grounded in common emitter transistor as amplifier?
With a common emitter amplifier it's the emitter that is usually grounded.
Which transistor mode gives the inverted output?
common-emitter
What is the difference between common base emitter transistor and common base transistor?
Common base transistor if the emitter is open current Ie=0 but a small collector current thus exist.this current is reversed biased collector to the base voltage it is represented by Icbo while common emitter is d base terminal is open circuit and the base junction is reversed biased current Icbo flow from the tcollector to the emitter in the external circuit this current is called leakage current.
Which transistor configuration has the highest input impedance?
Common Emitter Configuration has maximum impedance.
Why common emitter configuration is mostly used for transistor as switch?
because in ce configuration value of input voltage requried to make the transistor on is very less value of the output voltage or output current
In a common emitter transistor the primary purpose of a resistor connected to the emitter is to?
The emitter resistor in a common emitter configuration provides negative feedback to the transistor, reducing both its voltage gain and distortion.
Why base in grounded in common emitter transistor as amplifier?
With a common emitter amplifier it's the emitter that is usually grounded.
Characteristic of pnp transistor in common emitter mode precautino and sources of error?
pnp transister in common emitter mode
Which transistor mode gives the inverted output?
common-emitter
What is an emitter follower?
This is a particular transistor amplifier configuration. In general, the input signal is applied to the base, the collector is connected to a supply voltage, and the output is taken between the emitter and power supply common. One of the characteristics of the emitter follower is the output voltage "follows" the input, but the output is reduced by the Vbe voltage (the voltage drop between base and emitter, approximately 0.7 V for a silicon bipolar transistor).
Why most transistor amplifiers are common emitter type?
because amplifiers are speakers
What is the difference between common base emitter transistor and common base transistor?
Common base transistor if the emitter is open current Ie=0 but a small collector current thus exist.this current is reversed biased collector to the base voltage it is represented by Icbo while common emitter is d base terminal is open circuit and the base junction is reversed biased current Icbo flow from the tcollector to the emitter in the external circuit this current is called leakage current.
Which transistor configuration has the highest input impedance?
Common Emitter Configuration has maximum impedance.
What configuration commonly employed in bipolar transistor amplifier?
Common Emitter - Class A Amplifier.
Can you use transistor as diode?
its the simplest thing to do. There are three legs in a transistor, one each of collector, base and emitter. So if you need to use it as a diode, just connect either collector-base or emitter-base. Say, if you use an NPN transistor, then the base region will be the anode of diode and emitter or collector will be the cathode of the diode.
What do you mean by common emitter configuration and biasing pnp transistors?
A common emitter BJT transistor has the emitter ground. So u measure input voltage at base with respect to the ground, i.e; emitter and also u measure the output voltage at collector with respect to the ground, i.e; emitter. Hence, the emitter is common and thus the name.
How does using a transistor with a different beta affect the operation of the common emitter amplifier?
Gain, in the common emitter amplifier, is beta (hFe) or collector resistance divided by emitter resistance, whichever is less. Substituting a different beta (hFe) transistor will affect gain, if hFe is less, or increase stability and design margin, if hFe is greater.
