Engine: Steam Plants

1. A harmonic vibrations associated with critical speed can easily be reached during start-up
2. B the danger of blade erosion damage from dry steam impingement is greater during start-up
3. C lubricant film thickness during start-up is considerably less than the dimensions of gear surface irregularities
4. D differential expansion can result from the temperature difference between the rotor and rotor casing

Tip: press A-D to answer