Question 546Steam Plants - Assistant Engineer

The correct answer is D) It can be used to connect the main turbine to the high-speed pinion. This type of coupling, known as a flexible or elastic coupling, is commonly used to connect the main turbine to the high-speed pinion in marine propulsion systems. The flexible design of the coupling allows for some misalignment between the turbine and pinion, which can occur due to thermal expansion, shaft deflection, or other factors. This helps to prevent excessive stress and wear on the components. The other answer choices are incorrect: A) This coupling is not typically used between the first reduction pinion and second reduction gear, as those components usually have a more rigid connection. B) The flexible coupling is not limited to use on small auxiliary turbines, but can be employed on larger main propulsion turbines as well. C) While the coupling does allow for some misalignment, this is not its primary purpose, which is to connect the turbine to the high-speed pinion.