# Mechanical Engineering - Hydraulic Machines - Discussion

Discussion Forum : Hydraulic Machines - Section 1 (Q.No. 6)

6.

Discharge of a centrifugal pump is

Answer: Option

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.
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.

Also, Discharge Head is directly proportional to D^2,

Power is Directly proportional to N^3.

Honey said:
8 years ago

I think, All the options are not satisfied. The correct answer will be directly proportional to the cube of the diameter of vanes.

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.

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

Venkat said:
7 years ago

The Answer is B.

Discharge of centrifugal pump is directly proportional to its (dia)^2.

Q = A * V,

Here A = π * D^2/4.

Discharge of centrifugal pump is directly proportional to its (dia)^2.

Q = A * V,

Here A = π * D^2/4.

Hrushi Nikam said:
4 years ago

When we calculate for specific speed we take the assumption of B being proportional to Diameter. So, option C is correct.

Shiva said:
7 years ago

As Q is directly proportional to B and D and B (width) is proportional to D. Therefore Q is directly proportional to D^2.

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.

So the correct answer is Q is directly proportional to cube of the diameter(D) of the impeller.

Sushil said:
1 decade ago

Discharge of centrifugal pump is given by Q = (pi)(D2)(B2)(Vf2).

As per above equation option (A) is correct.

As per above equation option (A) is correct.

Parameswararao said:
7 years ago

Is directly proportional to the square of the diameter (refer R. K. Rajput textbook pg no. 1219).

Samuel said:
2 years ago

I think, here It should be Discharge Head.

And accordingly, option C would be correct.

And accordingly, option C would be correct.

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