Engine : Steam Plants - 194/811
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| The labyrinth packing ring in an interstage diaphragm of an impulse turbine is prevented from rotating by _______. |
| A) spring tension exerted on retaining rings |
| B) a horizontal key joint extending into a slot |
| C) steam pressure exerted on the packing segments |
| D) the weight of the diaphragm acting on the packing ring |
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