Question 205General Subjects - Assistant Engineer

The correct answer is A) viscosity will increase. When normal operating pressure is applied to the hydraulic oil in a high-pressure system, the viscosity of the oil will increase. This is due to the compressibility of the oil - as the pressure increases, the molecules in the oil are forced closer together, resulting in an increase in viscosity. The other answer choices are incorrect: B) viscosity will decrease - the opposite is true, viscosity increases with increased pressure. C) volume will increase - the volume of the oil will actually decrease as the pressure increases, due to the compressibility of the oil. D) floc point will increase - the floc point, which is the temperature at which wax crystals form in the oil, is not affected by the applied pressure.