21. Which of the following pump is successfully used for lifting water from deep wells?
Centrifugal pump
Reciprocating pump
Jet pump
Air lift pump
✅ The correct answer is option D.
Hydraulic Machines MCQs
22. A double overhung Pelton wheel has
two jets
two runners
four jets
four runners
✅ The correct answer is option B.
24. By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
39.20%
48, 8%
84.80%
88.40%
✅ The correct answer is option C.
25. A Pelton wheel with one nozzle is preferred for a specific speed between 35 to 60 r.p.m.
TRUE
FALSE
✅ The correct answer is option B.
26. In a centrifugal pump, the water enters the impeller __________ and leaves the vanes axially.
axially
radially
✅ The correct answer is option B.
27. If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is
✅ The correct answer is option B.
28. Power required to drive a centrifugal pump is __________ proportional to N3.
directly
inversely
✅ The correct answer is option A.
30. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is
slow speed with radial flow at outlet
medium speed with radial flow at outlet
high speed with radial flow at outlet
high speed with mixed
✅ The correct answer is option D.