Operational amplifiers can amplify:
Correct answer: C. Both AC and DC
- A. AC only
- B. DC only
- C. Both AC and DC
- D. None of them
Explanation
An operational amplifier is a very high gain voltage amplifier. It is used to amplify the signals by increasing its magnitude and can amplify both DC and AC signals.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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About PN Junction
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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