# Mechanical Engineering - Hydraulic Machines - Discussion

Discussion Forum : Hydraulic Machines - Section 4 (Q.No. 10)
10.
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is __________ of the jet velocity
one-half
one-third
two-third
three-fourth
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
18 comments Page 1 of 2.

D. SINGH said:   8 years ago
The correct answer is option A.

Bharathi said:   8 years ago
The correct answer is option A. Because when moving vane depends on pressure doesn't a velocity.

Vijay said:   7 years ago
This is curved vane not a straight plate.

Ayan said:   7 years ago
The correct answer is option A.

Ajay gupta said:   7 years ago
You are right, I agree with you @Vijay.

Akash said:   7 years ago
Answer 1/3 is right it's curved vane.

Jaimin said:   7 years ago
1/3 is correct. I agree.

Rohit said:   6 years ago
Can anyone explain this?

Deepak rathva said:   6 years ago
1/3 is correct.
dn/du = 0 for max. n (efficiency).
Solving this we get u = V/3.

Naga said:   6 years ago
The hydraulic efficiency of an impulse turbine is maximum when the velocity of the wheel is one-half the velocity of a jet of water at the inlet.

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