For the PLC analog I/O control system shown, the fluid flow is controlled by
A)varying the amount of the valve opening.
B)switching the valve ON and OFF.
C)switching the level sensor ON and OFF.
D)varying the position of the level sensor.

Question

For the PLC analog I/O control system shown, the fluid flow is controlled by 
A)varying the amount of the valve opening. 
B)switching the valve ON and OFF. 
C)switching the level sensor ON and OFF. 
D)varying the position of the level sensor.

Quizplus · Accepted Answer

The analog I/O system is designed to control fluid flow, and to achieve this, variation of the valve opening is necessary. This will regulate the amount of fluid entering and leaving the system, providing a consistent flow rate. Switching the valve ON and OFF or changing the position of the level sensor will not be as effective in controlling fluid flow.

For the PLC Analog I/O Control System Shown, the Fluid