Q3: Material A and Material B are collected in a tank as shown where the system consists of three Push-Button, three Level Sensors, two Inlet valve, one Outlet valve, Heater, Temperature Sensor, Agitator Motor, and Alarm Light. Material A and Material B are to be mixed and heated until it reaches 90°C temperature, and it will be drain using outlet valve also high-level Alarm Light will come ON when the tank is full and stay on even if the tank level drops until the operator press Reset Push-Button. Implement automation of this system in PLC using Ladder Diagram programming language (Note: The tank is fed with Material A before B and the temperature sensor can withstand 200°C and it gives voltage from 0 to 10 volts) (25 Marks) Valve A Agitator Motor Valve B Level B Heater E Level A Low Level Sta Start Push-Button Stop Push-Button 36. ویر نکند Temperature sensor Outlet Valve Reset Push-Button Alarm Light

12. How is the A-hr capacity of a lead-acid battery determined?

The symbol shown is a a. normally open pressure switch. b. normally open flow switch. c. normally open float switch. d. normally open temperature switch.

26 CHAPTER 2 Symbols and Schematic Diagrams REVIEW QUESTIONS 7. Referring to the circuit in Figure 2-22, should the float switch be connected as a normally open or normally closed switch? 8. Referring to the circuit in Figure 2-22, what circuit component controls the actions of the two CR contacts? 1. The symbol shown is a a. polarized capacitor. b. normally closed switch. c. normally open, held closed switch. d. normally open contact. 2. The symbol shown is a a. normally closed float switch. b. normally open, held closed float switch. C. normally open float switch. d. normally closed, held open float switch. 9. Why is a circle most often used to represent a coil in a motor control schematic? 10. When reading a schematic diagram, are the control components shown as they should be when the machine is turned off or de-en- 3. The symbol shown is a(n) a. iron core transformer. ergized, or are they shown as they should be when the machine is in operation? b. auto transformer. c. current…