Controls and Instrumentation 2

controls-and-instrumentation-2

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175436

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A logic device that prevents a piece of equipment from starting because of a unsafe condition is a :

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175437

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During the start-up of a boiler equipped with an automatic control system and flame scanning device, the manual fuel supply valves:

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175438

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The second element of a two element feed water control system compensates for or offsets:

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175439

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The electrical output from a thermocouple is measured by a:

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175440

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An analog control loop output must be put through a/an _____________ before the computer can react to the signal.

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175441

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In a control system, the controller tries to eliminate deviation by sending a signal to the:

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175442

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During a programmed start, if the forced draft fan starts but shuts down after 15 seconds, you should first check:

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175443

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If the igniter fails to spark ,which of the following is not a possible cause

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175444

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A sump pump will start on high level and stop on low level, this type of control is:

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175445

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The major elements needed to construct automatic control loop instrumentation systems includes a sensing element, a ___________, a controller and a control valve.

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175446

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During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect:

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175447

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A device which will cause a visible light signal to become an instrument analog signal is the:

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175448

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A thermocouple will produce a DC milli-voltage which:

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175449

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A modem is a device that:

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175450

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When an automatic unattended boiler starts up, the program timer will first:

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