Engine: Retired questions · Motor Plants and Auxiliary Boilers

1. A To increase the critical speed range of the engine, reduce the set point of 17A and 17B respectively, to .80 bar and 1.0 bar.
2. B Device 17A needs to be replaced, repaired, or reset to the set point coinciding with the RPM value for the low end of the critical speed range.
3. C The critical speed range will be varied as the set points of 17A or 17B are reset, therefore, another segment of the speed control circuit must be repaired.
4. D Both 17A and 17B need to be reset to decrease the critical speed range, although this procedure will increase the operating range of the engine.

Tip: press A-D to answer