Answer :
The Auxiliary accumulator pre-charge pressure is option D) 300 psi.
Auxiliary accumulators are used in hydraulic systems to store energy and provide a backup supply of fluid in case of a power failure. The pre-charge pressure of an auxiliary accumulator is the pressure that the accumulator is filled with before it is put into service.
So, this pressure helps to ensure that the accumulator will operate properly and that the system will be able to provide a reliable supply of fluid.
Note that the specific pre-charge pressure for an auxiliary accumulator will vary depending on the size and type of accumulator, as well as the requirements of the hydraulic system.
