In a centrifugal pump casing, the flow of water leaving the
vortex
tangential
radial
centrifugal
70 practice sets · Page 1 of 4
In a centrifugal pump casing, the flow of water leaving the
vortex
tangential
radial
centrifugal
Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of
49.20%
68.80%
84.80%
39.20%
Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of
49.20%
68.80%
84.80%
39.20%
The maximum number of jets generally employed in impulse turbine without jet interference is
6
8
12
4
Specific speed for reaction turbines ranges from
10 to 100
80 to 200
250 to 300
0 to 4.5
The optimum value of vane exit angle for a centrifugal pump impeller is
20-25 degree
30-40 degree
50-60 degree
10-15 degree
One horsepower is equal to
75 watts
550 watts
735 watts
102 watts
Francis turbine is
An axial flow turbine
A radial flow turbine
An impulse turbine
A reaction radial flow turbine
Hydraulic accumulator is used for
supplying large quantities of oil for very short duration
generally high pressures to operate hydraulic machines
supplying energy when main supply fails
accumulating oil
A turbine pump is basically a centrifugal pump equipped additionally with
backward curved blades
vaned diffusion casing
inlet guide blades
adjustable blades
In a centrifugal pump, the liquid enters the pump
At the bottom
At the top
From sides
At the centre
Impulse turbine is generally fitted
at the level of tail race
little above the tail race
slightly below the tail race
about 2.5 m above the tail race to avoid cavitation
In a centrifugal pump, the liquid enters the pump
at the top
at the bottom
at the center
from sides
For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred
centrifugal
axial flow
reciprocating
mixed flow
For small discharge at high pressure, following pump is preferred
centrifugal
axial flow
reciprocating.
propeller
High specific speed of a pump implies it is
centrifugal pump
mixed flow pump
axial flow pump
any one of the above
Medium specific speed of a pump implies it is
centrifugal pump
mixed flow pump
axial flow pump
any one of the above
Low specific speed of a pump implies it is
centrifugal pump
mixed flow pump
axial flow pump
any one of the above
For starting an axial flow pump, its delivery valve should be
closed
open
depends on starting condition and flow desired
could be either open or closed
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by
designing new impeller
trimming the impeller size to the required size by machining
not possible
some other alterations in the impeller