The statement "Piston diameter can be considered as the cylinder bore diameter" is true in most cases.
In an internal combustion engine, the bore diameter refers to the internal diameter of the engine cylinder, and the piston diameter refers to the diameter of the piston that fits inside the cylinder. Typically, the piston diameter is designed to be very close to or identical to the cylinder bore diameter, as the piston needs to fit snugly within the cylinder to function properly.
Therefore, the correct answer is:
(a) True