41.
The discharge through a reaction turbine with increase in unit speed
A
increases
B
decreases
C
remains unaffected
D
first increases and then decreases
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The discharge through a reaction turbine with increase in unit speed
increases
decreases
remains unaffected
first increases and then decreases
The flow rate in gear pump
increases with increase in pressure
decreases with increase in pressure
more or less remains constant with in-crease in pressure
unpredictable
Which place in hydraulic turbine is most susceptible for cavitation
inlet of draft rube
blade inlet
guide blade
penstock
A centrifugal pump is superior to a reciprocating pump because
It is a high speed pump
It is more economical
It gives smooth flow
All the above
Axial flow pump is started with its delivery valve
kept fully closed
kept fully open
irrespective of any position
kept 50% open
Centrifugal pump is started with its delivery valve
kept fully closed
kept fully open
irrespective of any position
kept 50% open
A turbine is a device which converts
Kinetic energy in to mechanical energy
Mechanical energy in to hydraulic energy
Hydraulic energy into mechanical energy
None of the above.
Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between
lift and resultant force
drag and resultant force
lift and tangential force
lift and drag
Reaction turbines are used for
low head
high head
high head and low discharge
low head and high discharge
An impulse turbine is used for
Low head of water
High head of water
Medium head of water
High discharge
Francis turbine is best suited for
medium head application from 24 to 180 m
low head installation up to 30 m
high head installation above 180 m
all types of heads
Any change in load is adjusted by adjusting following parameter on turbine
net head
absolute velocity
blade velocity
flow
The specific speed of turbine is defined as the speed of a unit
of such a size that it delivers unit dis-charge at unit head
of such a size that it delivers unit dis-charge at unit power
of such a size that it requires unit power per unit head
of such a size that it produces unit horse power with unit head
High specific speed of turbine implies it is
propeller turbine
Francis turbine
impulse turbine
any one of the above
Medium specific speea of turbine implies it is
propeller turbine
Francis turbine
impulse turbine
any one of the above
Low specific speed of turbine implies it is
propeller turbine
Francis turbine
impulse turbine
any one of the above
In axial flow fans and turbines, fluid enters and leaves as follows
radially, radially
radially, axially
axially, radially
axially, axially
Pressure intensifier increases the pressure in proportion to
square of inverse ratio of diameters
ratio of diameters
square of ratio of diameters
inverse ratio of diameters
In a centrifugal pump casing, the flow of water leaving the impeller, is
forced vortex
rectilinear flow
radial flow
free vortex motion
In a reciprocating pump, air vessels are used to
Reduce the acceleration head
Reduce the flow
Increase the delivery head
Smoothen the flow