Hydraulic Machines Questions

• Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres)
• Slip of a reciprocating pump is defined as the
• A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
• The speed of a turbine runner is
• The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is
• Discharge of a centrifugal pump is (where N = Speed of the pump impeller)
• Discharge of a centrifugal pump is
• Geometric similarity is said to exist between the model and the prototype, if both of them
• The unit discharge through the turbine is
• A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
• The working of which of the following hydraulic units is based on Pascal's law?
• The power developed by a turbine is (where H = Head of water under which the turbine is working)
• Which of the following pump is generally used to pump highly viscous fluid?
• A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is
• 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.
• The flow ratio of Francis turbine is defined as the ratio of the
• A draft tube is used with impulse turbines.
• The discharge through a reaction turbine __________ with the increase in unit speed.
• Power required to drive a centrifugal pump is __________ proportional to N3.
• A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero.