# 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 4 of 5.

Md mina, said:   7 years ago
Yes, A is correct.

NabaJyoti said:   7 years ago
It is Directly proportional to D.

Manikanta said:   7 years ago
Q = A.V.
A = π/4D2.
Q is directly proportional to d2.

Patel jigar k said:   7 years ago
q = d.
h =d^2.
p = d^3.

Ashutosh said:   7 years ago
According to affinity law.

Flow or discharge is directly proportional to impeller diameter if the speed of the shaft is constant.

Parameswararao said:   7 years ago
Is directly proportional to the square of the diameter (refer R. K. Rajput textbook pg no. 1219).

Sarat said:   7 years ago
Option A is the correct answer.

HEMANT said:   7 years ago
We know that Q = pi * d * b * vf.

So that is directly proportional to d.

Jwala said:   7 years ago
The correct answer should be A.

Smith said:   8 years ago
The discharge flow rate of a centrifugal pump is directly proportional to diameter. Discharge head is directly proportional to the square of the diameter. And power is directly proportional to the cube of the diameter. You can understand all this with the help of affinity laws.