# Blade speed ratio of impulse turbine

Q.  The blade speed ratio of impulse turbine is given as ___________
- Published on 16 Sep 15

a. (Blade velocity) / (Steam velocity at inlet)
b. (Blade velocity) / (Steam velocity at exit)
c. (Steam velocity at inlet) / (Blade velocity)
d. (Steam velocity at exit) / (Blade velocity)

#### Discussion

• MD NUR UN NABI   -Posted on 04 Jun 23
This is quite good for a mechanical engineer.
• Krishhh   -Posted on 07 Jan 20
Is it desirable or not ?
• Rajan    -Posted on 22 Nov 17
Yes
• Rajan    -Posted on 22 Nov 17
Yes
• Pankaj   -Posted on 13 Oct 15
The impulse turbine works on the principle of impulse. Therefore it follows the impulse momentum equation.

Blade velocity of impulse turbine is given by,

Cb = (π d N) / 60

Where,
d = Drum diameter

N = Speed of turbine in r.p.m.

Stem velocity at inlet is represented by Ci

Blade speed ratio of an impulse turbine can be defined as the ratio of blade velocity to steam velocity at inlet.

s = (Blade velocity) / (Steam velocity at inlet)

s = Cb / Ci

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