# Mechanical Engineering - Hydraulic Machines - Discussion

Discussion Forum : Hydraulic Machines - Section 1 (Q.No. 6)
6.
Discharge of a centrifugal pump is
directly proportional to diameter of its impeller
inversely proportional to diameter of its impeller
directly proportional to (diameter)2 of its impeller
inversely proportional to (diameter)2 of its impeller
Explanation:

Discharge of a centrifugal pump is directly proportional to (Diameter)^2 of its impeller.

Head of a centrifugal pump is directly proportional to (Diameter)^2 of its impeller.

Power Developed of a centrifugal pump is directly proportional to (Diameter)^4 of its impeller.

Discussion:
49 comments Page 2 of 5.

Hemanth G said:   6 years ago

I believe discharge refers to the outlet of the centrifugal compressor so

Q= π* D*B*Vf2 is the formula, that means A-option is the correct one to be chosen.

Deepak Rathva said:   6 years ago
Q= π x D x B x Vf.

Here, B also depends on D.
Vf depends on u means depends on DN,
So Q is directly proportional to D^3,
So all options are wrong.

Pal said:   6 years ago
Q= π*D*v*b and v=πdN/60.

So the right answer is proportional to d^2.

ANGARI ABHINAY said:   6 years ago
Discharge of centrifugal pump formula π*D*b*V,
Also, Discharge Head is directly proportional to D^2,
Power is Directly proportional to N^3.

Debashis said:   6 years ago
Yes, option: C is correct.

Debashis said:   6 years ago
Option C is correct.

Saboor khan kamali said:   6 years ago
It is directly proportional to the square of the diameter.

Bapi said:   6 years ago
Q/{N(D^3)}=constant.
So the correct answer is Q is directly proportional to cube of the diameter(D) of the impeller.

Meet Patel said:   6 years ago
Q is directly proportional to D^3.

Ali said:   6 years ago