Extra Class

Which of the following is most frequently used as a band-pass or notch filter in VHF and UHF transceivers?

What is a crystal lattice filter?

Which of the following filters is used in a 2-meter band repeater duplexer?

Which of the following measures a filter’s ability to reject signals in adjacent channels?

How does a linear electronic voltage regulator work?

How does a switchmode voltage regulator work?

What device is used as a stable voltage reference?

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

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

How is battery operating time calculated?

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

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

What is the dropout voltage of a linear voltage regulator?

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

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

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

Which of the following can be used to generate FM phone signals?

What is the function of a reactance modulator?

What is a frequency discriminator?

What is one way to produce a single-sideband phone signal?