Q1#1. Modern aircraft hydraulic systems use?AMineral based fluid.BSynthetic fluids.CAlcohol based fluids.DVegetable based fluids.
Q2#2. A shuttle valve is used to?ASwitch from one supply to another.BSwitch from one service to another .COperate components in sequence.DMove components backwards and forwards.
Q3#3. One of the reasons for pressurising hydraulic reservoirs is to?APrevent pump cavitation.BPrevent the collection of bubbles in the reservoir.CPrevent the ingress of moisture into the fluid.DReduce the pressure rise necessary in the pump.