Question 128General Subjects - 1st Asst/Chief

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 under high pressure, which causes the molecules to become more closely packed, resulting in an increase in the oil's viscosity. The other answer choices are incorrect because: B) the pour point (not the floc point) would increase under high pressure, C) the viscosity would increase, not decrease, and D) the volume would decrease, not increase, due to the compressibility of the oil under high pressure.