Which instrument is used to verify compression and firing events?

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Multiple Choice

Which instrument is used to verify compression and firing events?

The instrument used to verify compression and firing events is the indicator because it can show how cylinder pressure changes over the entire engine cycle. An indicator records a pressure trace (often as a diagram or chart) that reveals the compression stroke as the pressure rises toward top dead center and, after that point, the firing event as a sharp rise in pressure when combustion occurs. This single chart lets you assess both the compression quality and the timing of ignition. A gauge would only give a single pressure reading at one moment, not the sequence of events. A thermometer measures temperature, not pressure timing. A manometer measures liquid-pressure differences, not the high-pressure, rapid changes inside an engine cylinder. So the indicator is the best tool for confirming both compression and firing events.

The instrument used to verify compression and firing events is the indicator because it can show how cylinder pressure changes over the entire engine cycle. An indicator records a pressure trace (often as a diagram or chart) that reveals the compression stroke as the pressure rises toward top dead center and, after that point, the firing event as a sharp rise in pressure when combustion occurs. This single chart lets you assess both the compression quality and the timing of ignition.

A gauge would only give a single pressure reading at one moment, not the sequence of events. A thermometer measures temperature, not pressure timing. A manometer measures liquid-pressure differences, not the high-pressure, rapid changes inside an engine cylinder. So the indicator is the best tool for confirming both compression and firing events.

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