I am from Instrumentation and Control branch. So questions were mostly asked related to actuators, different Temperature Measuring devices like pyrometer, RTD types, Thermocouple working explanation, about different pressure measuring devices, flow measurement devices like magnetic flow meter, then about PLC, SCADA and HMIs basics. They also asked to define accuracy, calibration of instruments. They also went for digital circuits knowledge like about flip-flops, synchronous and Asynchronous devices. And the fun part was they also tried to check gk and general awareness stuff somewhat ( I was asked about Elon Musk, latest version to iphone, etc.)