Question: For the circuit shown below: AC input = 1 2 0 V rms , 6 0 Hz . Transformer Ratio = 1 2 : 1

For the circuit shown below:
AC input =120V rms,60 Hz . Transformer Ratio =12:1. Reference Voltage =8.7V.R load =51Ohms. Ambient temperature =60 degrees C Transistor is a TIP31. There is no heatsink on the transistor.
Assuming the dropout voltage is VCE(sat) of the transistor (find this value in the TIP31 data sheet for ON CHARACTERISTICS), what is the lowest rms AC input voltage that will still maintain regulation?
For the circuit shown below: AC input = 1 2 0 V

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