Engine 2014: Electricity

1. A The set value and actual values are analog signals and the arithmetic processor is an analog computer
2. B The set value and actual values are digital signals and the arithmetic processor is an analog computer
3. C The set value and actual values are digital signals and the arithmetic processor is a digital computer
4. D The set value and actual values are analog signals and the arithmetic processor is a digital computer

Tip: press A-D to answer