Help please Select the best answer for each of the following statements: An elec

Question

Help please

Select the best answer for each of the following statements: An electrical wind turbine is a type of: Choked flow at a point in an open channel implies that The thrust on n pipe bend is a result of the water's and The piezometric head of a fluid is its. Pipes A & B are in parallel with Q_A = 10 gpm and Q_B = 15 gpm. If the total flow into the system is increased to 30 gpm, the new flow through Q_A is: Water at a depth y = 12-ft flows in a rectangular channel that has a critical specific energy of E_c = 15-ft. The current flow is; Across an open-channel hydraulic jump: The best device to measure the flow rate in a low-flow, shallow stream is a;

Explanation / Answer

a) Wind turbines converts the kinetic energy of wind to generate electricity or mechanical power. This is done by

using a large wind turbine usually consisting of propellers.

So best answer is impulse turbine (d).

b) Choked flow is a limiting condition where the mass flow will not increase with a further decrease in the

downstream pressure environment while upstream pressure is fixed.

So best answer is (a). A backwater is formed.

c) Forces on pipe bend is a result Change in Preasure and change in Momentum. So answer is (a).

d) Piezometric head is defined as elevation + preasure head.

e) QA : QB = 10:15 =2:3

QA+QB = 30 gpm then QA is (2/5)*30 = 12 gpm.

f) The current flow is (a) supercritical.

g) Best device to measure the flow rate in low flow shallow stream is Parshall flume.

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