Engine 2014: Electricity

1. A to produce a signal voltage that is proportional to error signal  voltage
2. B to produce a signal voltage that is proportional to the sum of all past error signal voltages multiplied by time
3. C to produce a signal voltage that is proportional to the rate of change of the current error signal voltage
4. D to produce an error signal that is the difference between the process variable feedback signal voltage and the setpoint signal voltage

Tip: press A-D to answer