CHEM-6 Midterm: CHEM 6 Dartmouth transsolns Exam
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Over: [6] give the major advantage and major disadvantage of each type of proximity sensor in the table below. Major disadvantage: [6] sketch the schematic symbol for each of the following, two position, three way, solenoid activated, spring return solenoid valve, variable displacement compressor, fixed restriction. Closed book, but one page of hand-written notes allowed for this section of the test: [20] a factory automation system is shown below. An inductive proximity sensor (wired to input x3) 12/15/01 detects the presence of metallic objects (shown in the dashed lines) as they move down the conveyor. Fully describe the correct operation of this system on a rung-by-rung basis. K6: [20] a fluid power system and its controls are shown below. Unfortunately, the plc circuit below does not accomplish the task: describe four major flaws in the design given below that prevent the system from operating properly, draw a new circuit diagram that corrects the problems.
