Engine : Steam Plants - 685/811
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| The safety valve nominal size for propulsion boilers and superheaters must be not less than 1 1/2 inches and not more than 4 inches. The term 'nominal size' refers to the __________. |
| A) free spring length |
| B) diameter of the inlet opening |
| C) diameter of the huddling chamber |
| D) diameter of the feather |
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