Hydraulics chapter 6-8 Test with Correct Answers

Hydraulics chapter 6-8 Test with Correct Answers The primary function of the liquid in a hydraulic system is to: - Answer-transmit the energy to do the work the system is designed to complete. List the two primary factors that determine the amount of friction between two surfaces. - Answer-1. the strength of the force 2. the type of surface involved. Define lubricity - Answer-The ability of a liquid to form a strong film between two bearing surfaces and adhere to the surface of the material. Name three major problems that may appear if a fluid with too low of a viscosity is used in a hydraulic system. - Answer-1. increased wear 2. increased internal leakage 3. decreased pump efficiency and control accuracy. The amount that the viscosity of a hydraulic fluid will change as the temperature of the fluid changes is indicated by a(n)_______________ number. - Answer-viscosity index Name three conditions in a fluid power system that promote oxidation and general deterioration of a hydraulic fluid. - Answer-1. high temperature 2. entrainment of air 3. reactions caused by contact with different metals in the system. Why do air bubbles entrained in a hydraulic fluid increase fluid oxidation? - Answer-To increase the surface area of the contact. Name three common ways that water can enter a fluid power system and contaminate the system fluid. - Answer-1. condensation in the reservoir 2. water sprayed on the equipment for cleaning purposes 3. exposure to weather in exterior installations.