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What is the output of the IC 7924?

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What is the output of the IC 7924?

(a) 12V

(b) -12V

(c) 24V

(d) -24V

I had been asked this question during an interview for a job.

This intriguing question comes from Voltage Regulators topic in chapter Regulators of Analog Circuits

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Right option is (d) -24V

Easiest explanation: The IC of series 78xx and 79xx are fixed voltage regulators, wherein the 78 represents those with a positive output and 79 is for those with a negative output. The xx value represents the magnitude of the output voltage being achieved. For proper operation, the input voltage should be at least 2V greater than the output voltage.

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