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A centrifugal pump with backward-curved blades has the following measured performance when tested with water at 20°C:
Q, gal/min: 0 400 800 1200 1600 2000 2400
H, ft: 123 115 108 101 93 81 62
P, hp: 30 36 40 44 47 48 46
(a) Estimate the best efficiency point and the maximum efficiency. (b) Estimate the most efficient flow rate, and the resulting head and brake horsepower, if the diameter is doubled and the rotation speed increased by 50%.
a feed water pump operates with a flow rate of 350 kgs. the water enters at 420 k. the inlet pressure is 0.7 mpa and
Evaluate the effect of the water spray on efficiency (net work out divided by heat input) and net power out per kg/s of dry air coming into the turbine.
a disk has a mass of 4kg and a radius of 90mm it is at rest when it is placed in contact with the belt which moves with
A circular specimen of MgO is loaded using a three point bending mode. Compute the minimum possible radius of the specimen without fracture, given that the applied load is 5560N, the flexural strength is 165 MPa. and the separation between load po..
if a particles position is described by the polar coordinates r 2 sin 2u m and u 4t rad where t is in seconds
Questions set on Entropy, Exergy, Cycles, Otto Cycle, Rankine Cycle. In a coal fired thermal power station, indicate where the exergy contained in the coal is destroyed. For each exergy destruction mechanism, explain whether there is a small..
Air enters a turbine at 40 kN/m2, 900 C, and leaves at 10 kN/m2. The flow is reversible and adiabatic. Inlet velocity is quite low and outlet velocity is 150 m/s through a cross-sectional area of 0.20 m2. Calculate the power output in kW.
the load on a 2 inch diameter hydraulic cylinder increases from 10000lb to 15000lb. due to compressibility of oil the
you are a new engineer at a company that manufactures gas-filled shock absorbers for racing cars. the chief engineer
Assume that viscous effects are negligible Plot this data using appropriate dimensionless groups
an equimolar mixture of n2 and o2 is heated to 2100 k at 1 atm which generates no. calculate the molar values of the
a 1000kg car is moving horizontally at a constant speed of 10kmhr on a straight path. what is the absolute minimum
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