The current gain of a transistor having a collector current of 10 mA and a base current of 40 A is:
Correct answer: C. 250
- A. 2.5
- B. 25
- C. 250
- D. 2500
Explanation
Current gain is the ratio of the change in the collector current to the change in the emitter current in a transistor. Mathematically α=△Ic/△Ie. Current gain = 1X10 -3 / 4X10 -6 =250
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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