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E7D06:What is the purpose of Q1 in the circuit shown in Figure E7-2?

E7D06E7D

What is the purpose of Q1 in the circuit shown in Figure E7-2?

Official figure for question E7D06

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E7D06 is It controls the current to keep the output voltage constant.

The key fact is It controls the current to keep the output voltage constant. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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More questions in E7D

E7D01How does a linear electronic voltage regulator work?E7D02How does a switchmode voltage regulator work?E7D03What device is used as a stable voltage reference?E7D04Which of the following describes a three-terminal voltage regulator?E7D05Which of the following types of linear voltage regulator operates by loading the unregulated voltage source?E7D07What is the purpose of C2 in the circuit shown in Figure E7-2?