Hydraulic Machines Questions

• The power produced by the reaction turbine is __________ to the head of water.
• The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
• The mechanical efficiency of an impulse turbine is
• The overshot water wheels are those in which the wheel runs entirely by the __________ of water.
• The overall efficiency of a reaction turbine is the ratio of
• If Hg is the gross or total head and hf is the head lost due to friction, then net or effective head (H) is given by
• The efficiency of a centrifugal pump will be maximum when the blades are bent backward.
• In a reaction turbine, the draft tube is used
• The capacity of a hydraulic accumulator is generally specified as the maximum amount of energy stored.
• In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
• Multi-stage centrifugal pumps are used to
• The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water.
• The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.
• A hydraulic coupling belongs to the category of
• The force exerted by a jet of water (in a direction normal to flow) impinging on a fixed plate inclined at an angle θ with the jet is
• In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.
• A Francis turbine is used when the available head of water is
• A ship with jet propulsion draws water through inlet orifices at right angles to the direction of its motion. The propelling force of the jet is (where a = Area of the jet, Vr = Relative velocity of the jet and ship = V + v, v = Velocity of the ship, and V = Velocity of the jet issuing from the ship)
• Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
• The ratio of quantity of liquid discharged per second from the pump to the quantity of liquid passing per second through the impeller is known as