Voltage regulator using operational amplifier.

Which among the following factors affects the output voltage of a regulated power supply?
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Due to operation of series pass transistor in an active region of linear voltage regulator_______.
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Which performance parameter of a regulator is defined as the change in regulated load voltage due to variation in line voltage in a specified range at a constant load current?
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State the reason for thermal shutdown of IC regulator?
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Which of the following is not a characteristic of adjustable voltage regulators?
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