Electronic Devices & Circuits - GATE practice papers - Electronics & Communication for Q. 493

Q.  The ratio of collector current to emitter current by maintaining collector to base voltage at a constant level  is usually  termed as ___________ (Marks : 01)
- Published on 19 Oct 15

a. Common Emitter Amplification Factor
b. Common Collector Amplification Factor
c. Common Base Amplification Factor
d. None of the above

ANSWER: Common Base Amplification Factor
 
The point of operation that moves on the characteristic curve for AC operation is basically represented as,
α AC = Δ Ic / Δ IE ( VCB = constant)
where, α AC is expressed as common base short amplification factor.
In DC mode of operation, collector current and emitter current are specified levels of current on the basis of majority carriers & hence can be relatively expressed as,
α AC = Ic / IE

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