Engine : Steam Plants - 725/811
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| With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________. |
| A) reduce the possibility of warping the turbine rotors |
| B) warm the astern guarding valve and the low lube oil pressure throttle trip |
| C) slowly bring the lube oil and bearings to operating temperature |
| D) distribute the gland sealing steam evenly throughout the glands |
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