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E7D - Practical Circuits

Extra Class

Power supplies: regulators, switchers, high voltage, protection

15 questions | Updated: Dec 9, 2025

All E0A E1A E1B E1C E1D E1E E1F E2A E2B E2C E2D E2E E3A E3B E3C E4A E4B E4C E4D E4E E5A E5B E5C E5D E6A E6B E6C E6D E6E E6F E7A E7B E7C E7D E7E E7F E7G E7H E8A E8B E8C E8D E9A E9B E9C E9D E9E E9F E9G E9H
E7D01

How does a linear electronic voltage regulator work?
E7D02

How does a switchmode voltage regulator work?
E7D03

What device is used as a stable voltage reference?
E7D04

Which of the following describes a three-terminal voltage regulator?
E7D05

Which of the following types of linear voltage regulator operates by loading the unregulated voltage source?
E7D06

What is the purpose of Q1 in the circuit shown in Figure E7-2?
E7D07

What is the purpose of C2 in the circuit shown in Figure E7-2?
E7D08

What type of circuit is shown in Figure E7-2?
E7D09

How is battery operating time calculated?
E7D10

Why is a switching type power supply less expensive and lighter than an equivalent linear power supply?
E7D11

What is the purpose of an inverter connected to a solar panel output?
E7D12

What is the dropout voltage of a linear voltage regulator?
E7D13

Which of the following calculates power dissipated by a series linear voltage regulator?
E7D14

What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?
E7D15

What is the purpose of a step-start circuit in a high-voltage power supply?