The drilling machine used when no electricity is available is _______.

Explanation:

Drilling machine:

• A drilling machine is a tool used for drilling holes in various materials, such as metal, ceramic wood, or plastic.
• It can be either portable or stationary.
• The principal types of drilling machines are:
  • sensitive bench drilling machine
  • pillar drilling machine
  • column drilling machine
  • radial arm drilling machine (radial drilling machine).

Ratchet drilling machine:

• A ratchet drilling machine is used for drilling holes where electricity is not available.
• It is hand operated drilling machine and is commonly used in structural applications like drilling a hole in a switchboard, etc.
• A tool for drilling holes, having the bit mounted in stock and rotated by a ratchet wheel and ratchet lever.