_______is a tube that brings water to turbines

• A. Forebay
• B. Penstock
• C. Spillway
• D. Trash rack

Answer: (B)

Penstock 
Penstock pipe is used to bring water from the dam to the hydraulic turbine.
Penstock pipes are made up of steel or reinforced concrete.
The turbine is installed at a lower level from the dam.
The penstock is provided with a gate valve at the inlet to completely close the water supply.
It has a control valve to control the water flow rate into the turbine.