Question 673Steam Plants - Assistant Engineer
70% to passThe labyrinth packing ring in an interstage diaphragm of an impulse turbine is prevented from rotating by _______________.
Aspring tension exerted on retaining rings
Ba horizontal key joint extending into a slot
Csteam pressure exerted on the packing segments
Dthe weight of the diaphragm acting on the packing ring
AI Explanation
The correct answer is B) a horizontal key joint extending into a slot. The labyrinth packing ring in an interstage diaphragm of an impulse turbine is prevented from rotating by a horizontal key joint that extends into a slot. This key joint locks the packing ring in place and prevents it from rotating, ensuring the proper sealing and functioning of the turbine. The other answer choices, such as spring tension, steam pressure, or the weight of the diaphragm, do not directly prevent the rotation of the packing ring in this specific component of the turbine.
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