The pressure of the water at the base of a nozzle of a Pelton wheel is 4850 , and the velocity of water at the same point is 6 The jet diameter is 20 cm, the velocity coefficient of the nozzle is 0.98, and the peripheral velocity coefficient o - 0.45. (a) If the efficiency of the wheel is 86 %, find the brake power. (b) If the pitch diameter of the wheel is 2.5 m, what should be the normal operating speed in rpm?

The pressure of the water at the base of a nozzle of a Pelton wheel is 4850 , and the velocity of water at the same point is 6 The jet diameter is 20 cm, the velocity coefficient of the nozzle is 0.98, and the peripheral velocity coefficient o - 0.45. (a) If the efficiency of the wheel is 86 %, find the brake power. (b) If the pitch diameter of the wheel is 2.5 m, what should be the normal operating speed in rpm?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

The pressure of the water at the base of a nozzle of a Pelton wheel is 4850 , and the velocity of water at the same point is 6. The jet diameter is 20 cm, the velocity coefficient of the nozzle is 0.98, and the sec peripheral velocity coefficient Ø = 0.45. (a) If the efficiency of the wheel is 86 %, find the brake power. (b) If the pitch diameter of the wheel is 2.5 m, what should be the normal operating speed in rpm?
A Pelton wheel works at the foot of a dam because of which the head available at the nozzle is 400 m. The nozzle diameter is 160 mm and the coefficient of velocity is 0.98, The diameter of the wheel bucket circle is 1.75 m and the buckets deflect the jet by 150°. The wheel-to-jet speed ratio is 0.45. Neglecting riction, calculate (1) the power developed by the turbine, (i) its speed and (i) hydraulic efficiency.
A Pelton wheel installation uses a water jet of 75 mm diameter to drive a wheel with the bucket on a diameter of 0,9 m. The deflection angle of the buckets is 160°. The relative velocity of the water is reduced by 12% while moving across the buckets. The rotational speed is 320 rev/min, the total pressure behind the nozzle 0,7 Mpa and velocity coefficient of the nozzle is 0,98. Determine: 2.1 the hydraulic power developed by the wheel 2.2 the turbine hydraulic efficiency. 2.2 the hydraulic efficiency of the wheel. 2.3 the overall efficiency of the turbine if the mechanical efficiency of the wheel is 96%.
In a Pelton wheel, the bucket peripheral speed is 10 m/s, the water jet velocity is 25 m/s and volumetric flow rate of the jet is 0.1 m³/s. If the jet deflection angle is 120°C and the flow is ideal, the power developed is (a) 7.5 kW (b) 15.0 kW (c) 22.5 kW (d) 37.5 kW
A pelton wheel having semi-circular buckets is 1min diameter. Pressure head at the nozzle when it is closed is 15 bars. The discharge when the nozzle open is 3.5 m/min. If the speed is 600 rpm, find power developed by wheel and its hydraulic efficiency. Assume overall efficiency as 85% and Cy 0.98. B A V,= Vw1 %3D Inlet V. w2 V2 G Outlet
(c) The above pump is scaled up to 46 cm diameter operating in water at BEP at 1760 rev/min. The measured NPSH is 4.88 m and the friction loss between the inlet and pump is 6.71 m. Will it be sufficient to avoid cavitation if the pump inlet is placed 2.74 m below the surface of a sea level reservoir? The barometric pressure is 740 mm Hg and the vapour pressure of water at the prevailing temperature is 26 mm Hg. The specific gravity of Hg is 13.55. (d) A 70 cm diameter centrifugal pump which is dynamically similar to the tested pump tabulated above, is delivering water at 1.26 m³/s against a 100m head. Determine the operating speed in rev/min and the required power consumption. Note that the pump is not necessarily running at the design point. Use SI system for your calculations where the pump speed N should be in rad/sec. You may take density of water as 1000 kg/m³ and standard acceleration of gravity g = 9.81 m/s².
This course EHide block A centrifugal pump with the following impeller dimensions is used to pump water. The pump is running at 1000 rpm. The ideal head rise through the pump is 190 ft. b2 Poz 72 by The parameters of the impeller are as follows: r2= 9in, b2=3in, B2= 31° Take g= 9.81 m/s23 32.2 ft/s2 pw = 998 kg/m3 = 1.94 Slug/ft. Determine the theoretical flow rate in gpm Choose.. Determine the theoretical Power shaft in (hP) Choose...
4.1 The bucket ofa Pelton wheel which rotates at 100 rpm deflect the jet with diameter 50 cm through angle of 1600 while the relative velocity of the water is reduced by 10% due to friction. The bucket speed is 0,47 of the jet. The water is supplied from a reservoir 500 m above the nozzle, which operates with velocity coefficient of 0,97. Losses between the reservoir and nozzle amout to head loss of 50 m. The mechanical efficieny is 92%. Find 4.1.1 the wheel diameter. 4.1.2 the Euler head. 4
A centrifugal fan rotates at a speed of 1460r/min and must deliver 1, 3m^3/s of air of density 1,22kg/m^3 at a total pressure of 370pa. Assume the manometric efficiency of the fan is 55% and that the whirl velocity at the exit of the impeller is double that of the peripheral velocity. Ignore mechanical losses and calculate a) the peripheral velocity of the impeller. b) the diameter of the impeller c) the power required to drive the fan
A single-stage centrifugal pump having a suction pipe 254 mm in diameter anda discharge pipe diameter of 5 inches is being tested and found out to discharge 48 lps ofwater. A pressure gage connected to the inlet pipe reads 118 mm Hg vacuum and adischarge gage reads 150 kPa at a distance 100 cm above the point where the inletpressure was measured. If the kW rating of the driving motor is 12 kW, calculate: a) the pump efficiency. b) if this pump runs at 1800 rpm, what will be the new discharge rate,head, and power developed if the pump speed was increased to 3600 rpm? Assumeconstant efficiency. c) Determine the pump type.
The pressure of the water base of a Pelton Wheel is 4850 kPa and the velocity at the same point is 6 m/s. The jet diameter is 20 cm, and the velocity coefficient is 0.98 and the turbine’s efficiency is 86%. Find the brake power, in bkw.
Q.1 Acentrifugal pump running at 500 rpm and at its maximum efficien is delivering a head of 30 m at a flow rate of 60 litres per minute. Ift rpm is changed to 1000, then the head H in metres and flow rate C litres per minute at maximum efficiency are estimated to be (a) H= 60, Q = 120 (c) H = 60, Q = 480 (c) H = 120, Q = 120 (d) H= 120. Q-30 %3D %3D %3D %3D %3D