The ability of the device illustrated to...

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Question 1 of 205eccef9cbacbc34ba4d45ae0

The ability of the device illustrated to produce sound is greatly affected by the adjustments to "B". Another factor that can affect the proper operation of this device is the __________. See illustration GS-0099.

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🔍 Key Concepts

• Principle of operation of a steam whistle or diaphragm horn – how does the steam/air flow create vibration and sound? • Role of adjustment point B – what part of the vibrating system is it changing (clearance, tension, or length)? • Effect of flow path restrictions (nozzles, orifices) versus parts that only move the linkage or support the housing.

💭 Think About

• Trace the steam/air path from the inlet to the outlet using the arrows in the illustration. Which labeled items are directly in that flow path and which are only structural or linkage parts? • Ask yourself: if this factor changed, would the pitch or ability to vibrate change immediately, or would the horn still sound the same until something extreme happened? • Compare how changing a mechanical dimension (like a lever length) differs from changing the passage where the steam/air actually accelerates past the vibrating edge.

✅ Before You Answer

• Identify which choice changes the velocity and pressure drop of the steam/air right at the sounding edge of the diaphragm or bell. • Verify which items (E, I, K) are primarily supports/linkage and which one directly controls the size of the jet or opening that excites the sound. • Make sure the factor you pick would affect both starting to sound and maintaining a clear tone, not just ease of operating the lever.

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