61 TOP Hydraulic Machines - Mechanical Engineering Multiple choice Questions and Answers List
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Course
Hydraulic Machines - Mechanical Engineering
Institution
Hydraulic Machines - Mechanical Engineering
Latest Hydraulic Machines Questions and Answers pdf free download
1. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal
pumps) because of
(a) high initial and maintenance cost
(b) lower discharge
(c) lower speed of operation
(d) necessity of ai...
61 TOP Hydraulic Machines - Mechanical Engineering
Multiple choice Questions and Answers List
Latest Hydraulic Machines Questions and Answers pdf free download
1. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal
pumps) because of
(a) high initial and maintenance cost
(b) lower discharge
(c) lower speed of operation
(d) necessity of air vessel
ww
(e) all of the above.
Ans: a
w .E
2. In a centrifugal pump casing, the flow of water leaving the impeller, is
(a) rectilinear flow asy
(b) radial flow
(c) free vortex motion En
(d)
(e)
forced vortex
none of the above.
g ine
Ans: c
eri
3. Head developed by a centrifugal pump depends on
(a) impeller diameter
n g .n
(b) speed
(c) fluid density
et
(d) type of casing
(e) (a) and (b) above.
Ans: e
4. For starting an axial flow pump, its delivery valve should be
(a) closed
(b) open
(c) depends on starting condition and flow desired
(d) could be either open or closed
(e) partly open and partly closed.
Ans: b
, 5. The efficiency of a centrifugal pump is maximum when its blades are
(a) straight
(b) bent forward
(c) bent backward
(d) bent forward first and then backward
(e) bent backward first and then forward.
Ans: c
6. In a centrifugal pump casing, the flow of water leaving the
(a) radial
(b) radial
(c) centrifugal
(d) ww
rectilinear
(e)
Ans: e
vortex.
w .E
asy
7. Centrifugal pump is started with its delivery valve
(a) kept fully closed
(b) kept fully open En
(c) irrespective of any position
(d) kept 50% open
g ine
(e) none of the above.
eri
Ans: a
8. Axial flow pump is started with its delivery valve
n g .n
(a) kept fully closed
(b) kept fully open
et
(c) irrespective of any position
(d) kept 50% open
(e) none of the above.
Ans: b
9. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump
characteristics should be
(a) horizontal
(b) nearly horizontal
(c) steep
(d) first rise and then fall
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