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 control system uses an analog input from the level sensor and an analog output to control the valve opening. Therefore, the fluid flow is controlled by varying the amount of the valve opening, which directly affects the flow rate.

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