Discussion
In series pass voltage regulator using zener diode, the function of zener diode is a
Answer: B
The key takes the zener diode in a series pass regulator as a voltage comparator (option B). The zener holds a fixed reference voltage at the base of the pass transistor, and the base-emitter junction compares the output with it: \(V_{BE} = V_Z - V_{out}\), so any change in the output changes the drive.
The zener is not the regulator itself (A), since the pass transistor does the regulating, and 'breakdown diode' (C) names the device and not its function. It is not used to compensate temperature (D) in the simplest circuit. The answer rests on the key.
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