Engineering Board Exam Reviewer · Fluid Mechanics · hard
A Pelton wheel bucket deflects a jet through 165°. The jet velocity is 50 m/s, the bucket speed is 25 m/s and the flow is 0.1 m3/s. Neglecting friction, what power is developed?
- 122.87 kW
- 125.00 kW
- 245.74 kW
- 62.50 kW
Answer
A. 122.87 kW
Solution
F = Q(V - u)(1 - 165°) = 1000(0.1)(25)(1.9659) = 4914.8 N. P = Fu = 4914.8(25) = 122.87 kW.
More Fluid Mechanics questions
- Using the Hazen–Williams formula V = 0.849 C R0.63 S0.54, find the flow in a 300 mm pipe flowing full with C = 120 and a hydraulic…
- Oil ( = 0.1 Pa· s) flows in laminar flow at an average velocity of 0.5 m/s through a 20 mm pipe 10 m long. What is the pressure drop?…
- An open tank of water 2 m deep is in an elevator accelerating downward at 3 m/s2. What is the gauge pressure at the bottom of the tank?
- Power transmitted through a pipeline from a reservoir to a nozzle is maximum when the friction head loss in the pipe equals:
- A closed tank contains water 3 m above an orifice, with air above the water at 50 kPa gauge. If Cv = 0.97, what is the jet velocity at the…
- An inverted U-tube manometer containing oil (SG = 0.8) is connected between two points in a horizontal water pipe. The manometer…
- A vertical rectangular gate 1.2 m wide and 2 m high is hinged at its top edge, which is 3 m below the water surface. What horizontal force…
- A buoy with a volume of 0.2 m3 and a weight of 500 N is held fully submerged in fresh water by a vertical cable anchored to the bottom…
- Water flows at 100 L/s upward through a pipe that reduces from 300 mm to 150 mm. The smaller section is 3 m higher. If the pressure at the…
- A pump lifts 15 L/s of water to a tank 20 m higher through a 100 mm pipe 200 m long (f = 0.02). Neglecting minor losses, what power must…