Questions 9-55 through 9-58 concern thehydraulic servovalve shown in textbookfigures 9-4 and 9-5.9-55.The feedback signal which sets in motionthe fine control required to actuate theservovalve may be produced by which ofthe following means?1.Electricity2.Fluid pressure3.Mechanical links4.All of the above9-56.What will the magnetic reed do when theinput signal matches the feedback signalto the amplifier?1.It starts to vibrate2.It returns to neutral3.It blocks the right nozzle4.It blocks the left nozzle9-57.When the left solenoid is energized, inwhat direction does the reed move andwhat action of the spool valve results?1.The reed moves right and the spoolvalve moves left2.The reed moves left and the spoolvalve moves right3.Both the reed and the spool valvemove to the left4.Both the reed and the spool valvemove to the right9-58.The spool valve is returned to a centralposition by spring action when the fluidpressure is relieved through which of thefollowing chambers?1. A2. B3. C4. D60
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