Extra exam question E6C07
Subelement E6, CIRCUIT COMPONENTS· Group E6C
What best describes a pull-up or pull-down resistor?
- A.A resistor in a keying circuit used to reduce key clicks
- B.A resistor connected to the positive or negative supply used to establish a voltage when an input or output is an open circuit (correct answer)
- C.A resistor that ensures that an oscillator frequency does not drift
- D.A resistor connected to an op-amp output that prevents signals from exceeding the power supply voltage
WhyA pull-up or pull-down resistor is connected to the positive or negative supply to establish a voltage when an input or output is an open circuit. A pull-up or pull-down resistor is a resistor connected to the positive or negative supply rail specifically to establish a defined voltage level at a node when whatever is supposed to be driving it, an input or an open-collector/open-drain output, is in a high-impedance or open-circuit state, answer B. It isn't a key-click suppression resistor, isn't there to stabilize an oscillator's frequency, and isn't a resistor limiting an op-amp's output swing, those are different circuit functions entirely.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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