Q. The safe depression head for open wells is generally taken to be x times the critical depression head when x is ______

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Q. The yield of a well depends on ________________

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Q. Which type of open well is suitable when the sub-soil is formed of gravel or coarse sand deposits?

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Q. Depending upon the type of sub-soil formation, the construction of well is done in two ways i.e. Dug wells and Sunk wells. Dug wells are constructed in soft formations.

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Q. A well 3 meters in diameter has its normal water level 3 meters below the ground level. By pumping water level in the well is depressed to 10 meters below the ground level. In 4 hours the water rises by 5 meters. Calculate the specific yield of the well.

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Q. An open well is called shallow well when ____________

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Q. Open well has big diameter than tube well because ____________

i. Open well has to irrigate more area.
ii. Water contribution to the well is natural and therefore, the percolation area has to be more.
iii. Storage of water has to be made before irrigation is done.

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Q. If the sub-soil formation is of fine sand, the rough value of the specific yield of well per unit area of the well (K/A) given by Marriot is ____________

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Q. Which of the following method of lifting water is very suitable when the depth of well is from 12 to 20 meters?

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Q. Mota layer sometimes is also known as Marbarwa or Magasan is an impervious layer.

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Q. A well is to be constructed in a fine sandy sub-soil formation. The discharge of the well under the depression head of 4 m is 0.004 m³/sec. Calculate the diameter of the well.

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Q. The most widely used type of a deep state tube well in India is __________

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Q. The general average yield from standard tube wells is of order of____________

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Q. Which of the following tubewell is suitable when a deep bearing stratum lies below an impervious layer and water contribution can take place through bottom only?

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Q. In cavity tubewell, there is a possibility of water tapping through sides and the flow is radial.

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Q. What is the measure of the fineness of an aquifer?

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Q. What is Pack Aquifer Ratio?

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Q. According to the Central Board of Irrigation and Power, the PA ratio for graded aquifer should be _______________

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Q. For good design, the uniformity coefficient (Cᵤ) of the gravel material should preferably be ______

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Q. The efficiency of the centrifugal pumps commonly used for lifting water from wells may be of the order of _____________

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