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

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ISRO SAC Technician B Fitter 21 Oct 2018 Official Paper
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  1. ratchet drilling machine
  2. sensitive drilling machine
  3. pillar drilling machine
  4. radial drilling machine

Answer (Detailed Solution Below)

Option 1 : ratchet drilling machine
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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.

 

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