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Q: Which of the following is just above the blank pipe in the tubewell?
  • A. Fulcrum
  • B. Barrel
  • C. Main tube-well pipe
  • D. Strainer
Correct Answer: Option D - Strainer is provided just above the blank pipe in the tubewell. • Tube wells are classified as– (i) Strainer type tubewell–These types tubewells are considered unsuitable for fine grained strata. • These tubewells consist of blank pipe, screen or strainer pipe. (ii) Cavity type tubewells–These type tubewells is suitable for strong clay stratum. • In this type tubewells not utilize strainers and water supply from the bottom and not from the sides. (iii) Slotted type tubewells–Shrouding is provided in slotted type tubewell. It is also known as grave pack tubewell.
D. Strainer is provided just above the blank pipe in the tubewell. • Tube wells are classified as– (i) Strainer type tubewell–These types tubewells are considered unsuitable for fine grained strata. • These tubewells consist of blank pipe, screen or strainer pipe. (ii) Cavity type tubewells–These type tubewells is suitable for strong clay stratum. • In this type tubewells not utilize strainers and water supply from the bottom and not from the sides. (iii) Slotted type tubewells–Shrouding is provided in slotted type tubewell. It is also known as grave pack tubewell.

Explanations:

Strainer is provided just above the blank pipe in the tubewell. • Tube wells are classified as– (i) Strainer type tubewell–These types tubewells are considered unsuitable for fine grained strata. • These tubewells consist of blank pipe, screen or strainer pipe. (ii) Cavity type tubewells–These type tubewells is suitable for strong clay stratum. • In this type tubewells not utilize strainers and water supply from the bottom and not from the sides. (iii) Slotted type tubewells–Shrouding is provided in slotted type tubewell. It is also known as grave pack tubewell.