Exam 51: Digital Logic and the Bounceless Switch

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Digital logic gates are generally housed in ____-pin IC packages.

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What happens when a normal snap-action switch is used with an electronic control system?

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When this type of switch is used with an electronic control system, contact bounce can cause a great deal of trouble. Most digital logic circuits are very fast-acting and can count each pulse when a contact bounces. Depending on the specific circuit, each of these pulses may be interpreted as a command. Contact bounce can cause the control circuit to "lose its mind."

What is a snap action?

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Almost all sensing devices employ a snap-action switch. When a mechanical switch is used, the snap action is generally obtained by spring loading the contacts. This snap action is necessary to ensure good contact when the switch operates. Assume that a float switch is used to sense when water reaches a certain level in a tank. If the water rises at a slow rate, the contacts will come together at a slow rate, resulting in a poor connection. However, if the contacts are spring loaded, when the water reaches a certain level, the contacts will snap from one position to another.

Integrated circuits can be tested with a volt-ohm-milliammeter.

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The simplest of all the gates is the ____________________.

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There are five basic types of gates: the AND, OR, NOR, NAND, and ____.

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Gate circuits are multi-input, ____________________-output devices.

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When a control circuit is constructed, it must have sensing devices to tell it what to do.

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What gate is often referred to as the basic gate? Why is it referred to as the basic gate?

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What is an easy way to remember how an OR gate functions?

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Several circuits can be used to construct a bounceless switch, but the most common construction method uses ____________________ gates.

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Although most contacts have a snap action, they do not generally close with a ____ action.

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Almost all sensing devices employ a(n) ____________________ switch.

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Digital means a device that has only three states.

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