# Mechanical Engineering - Hydraulic Machines - Discussion

Discussion Forum : Hydraulic Machines - Section 1 (Q.No. 1)

1.

Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.

Discussion:

34 comments Page 1 of 4.
Nani said:
1 year ago

As per affinity law, break horse power is directly proportional to cube of diameter or cube of rpm.

(4)

Sai khelwane said:
4 years ago

Answer D is correct.

Evans siripi said:
5 years ago

I think the answer is D.

Raj said:
5 years ago

Given answer D^4 is right.

Deepak Rathva said:
6 years ago

The Correct answer is D^5.

Ref: R.K.Bansal.

Ref: R.K.Bansal.

Sullahe sanu said:
6 years ago

d^4 is the answer.

Sandeep said:
6 years ago

d^4 will be the correct answer. Since the question is asked as directly proportional the tangent flow of an impulse turbine always takes 4th power to diameter.

(2)

Pushpender said:
6 years ago

Affinity laws applied to axial and radial flows pumps and turbines. Its a tangent flow ; impulse turbine so I think 4th power is correct.

Sharan said:
6 years ago

Ans: C is correct.

i.e d^3--p=TW=(Tou*pi*d^3/16*T)*(v/r).

i.e d^3--p=TW=(Tou*pi*d^3/16*T)*(v/r).

Manish said:
7 years ago

Note that there are two sets of affinity laws:.

Affinity laws for a specific centrifugal pump - to approximate head, capacity and power curves for different motor speeds and /or different diameter of impellers.

Affinity laws for a family of geometrically similar centrifugal pumps - to approximate head, capacity and power curves for different motor speeds and /or different diameter of impellers.

Affinity laws for a specific centrifugal pump - to approximate head, capacity and power curves for different motor speeds and /or different diameter of impellers.

Affinity laws for a family of geometrically similar centrifugal pumps - to approximate head, capacity and power curves for different motor speeds and /or different diameter of impellers.

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