Draw the symbol and state the applications of : 1) Push button switch 2) Selector switch 3) Solenoid valve 4) Limit switch
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1) Push Button 

It is used in start-stop control circuit

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2) Selector Switch : It is used to select one input out of many, 

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3) Solenoid valve: is used to control flow of fluid such as air, pressurized oil. 

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4) Limit switch: It is used to detect presence of object

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