By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power.The saving in case of a double acting reciprocating pump is
Dynamic similarity is said to exist between the model and the prototype, if both of them
The power developed by a turbine is (where H = Head of water under which the turbine is working)
The discharge through a reaction turbine __________ with the increase in unit speed.
A Pelton wheel developskW under a head ofmetres while running atr.p.m. and discharginglitres of water per second. The unit speed of the wheel is
The impeller of a centrifugal pump may have
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship.
If the Francis turbine is run belowpercent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
Slip of a reciprocating pump is negative, when
In a reciprocating pump, air vessels are used to
In a mixed flow reaction turbine, the flow of water is partly radial and partly axial.
The width of the bucket for a Pelton wheel is generally __________ the diameter of jet.
The centrifugal pump preferred for a specific speed betweentor.p.m. is
A turbine developskW under a head ofmetres atr.p.m. Its specific speed is
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is __________ of the jet velocity,
Kinematic similarity is said to exist between the model and the prototype, if both of them
The cavitation in reaction turbines is avoided, to a great extent by
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
Which of the following is not an impulse turbine?
In a Francis turbine, the pressure at inlet is __________ that at outlet.
If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.
A draft tube is used with impulse turbines.
A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.
A Pelton wheel with one nozzle is preferred for a specific speed betweentor.p.m.
The speed ratio in case of Francis turbine varies from
The power of a centrifugal pump working under constant head and discharge increases with the speed.
The specific speed of a hydraulic turbine depends upon
Which type of the pump is different from others in the same group?
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