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Amateur Extra Class: 2020–2024
Today
Sections
E1: Commission's Rules
E2: Operating Procedures
E3: Radio Wave Propagation
E4: Amateur Practices
E5: Electrical Principles
E6: Circuit Components
E7: Practical Circuits
E8: Signals and Emissions
E9: Antennas and Transmission Lines
E0: Safety
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Element 4
E6
E6C
E6C07
E6C07:
What best describes a pull-up or pull-down resistor?
A resistor in a keying circuit used to reduce key clicks
A resistor connected to the positive or negative supply line used to establish a voltage when an input or output is an open circuit
A resistor that ensures that an oscillator frequency does not drift
A resistor connected to an op-amp output that prevents signals from exceeding the power supply voltage
E6C01
E6C02
E6C03
E6C04
E6C05
E6C06
E6C07
E6C08
E6C09
E6C10
E6C11