When the control cartridge is energized in a typical single actuator EUI, which of the following passages is immediately closed off?
A. cylinder head return gallery
B. EUI pump chamber to nozzle duct
C. nozzle valve pressure chamber
D. EUI control valve spill
Answer: D
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Referring to the figure shown below, technician A says that a shorted to ground circuit 90L between the differential pressure switch and the flow switch will cause the pump motor to run even though both the differential pressure and flow switches are open. Assuming fuse F33 is supplied with unswitched battery positive voltage and that the flow switch is normally closed, technician B says that closing the hydraulic brake switch (50) with ignition off should cause the pump motor to operate. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
Answer the following statement(s) true (T) or false (F)
1. Fuel cells have several moving parts. 2. Molten Carbonate Fuel Cell (MCFC) systems operate at relatively low temperatures. 3. Solid Oxide Fuel Cell (SOFC) systems are unusual in that the fuel cell itself is entirely solid. 4. SOFC electrolytes are ceramics that conduct ions at elevated temperatures. 5. Fuel reformation is an endothermic reaction.
In what ways do surface datum feature symbol applications, axis datum symbol applications, and center plane datum symbol applications differ from each other?
A. When surface datums are shown on extension lines, they are offset from the dimension line arrows, while axis datums and center plane datums can align with dimension line arrowhead. B. In surface datum symbols the equilateral triangle is filled, while in axis datums and center plane datums the equilateral triangle is left unfilled. C. Axis datums and center plane datums are verified from one of the existing surfaces. D. The surface datum is the only one to position the part in relation to a datum reference frame. E. none of the above
The element most often involved in oxidation reactions as minerals weather is ________
A) copper B) magnesium C) silicon D) iron E) aluminum