What is the connection of the neutral part of an electrical system that reduces the possibility of damage from lightning by connecting it to the earth

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false