# 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 1 of 5.
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.

DebashisD said:
2 years ago

Discharge = Q * D * N.

(1)

Shaik Murtuza said:
4 years ago

Option A is the correct answer.

(1)

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.

Fouziahussain said:
4 years ago

Q=(pi)DbV.

D=Diameter of impeller.

B =Width.

V= Velocity of flow.

D=Diameter of impeller.

B =Width.

V= Velocity of flow.

Prithvi singh said:
5 years ago

Q is directly proportional to D^3.

(4)

Engr Aamir said:
5 years ago

If Q=Av then Q is directly or inversely proportional?

Biswajit Das said:
5 years ago

Option C is correct.

That Q= π D b Vf.

Anyhow Vf is related to V and V is related to u and u =π D N /60.

So, Q is directly proportional to D^2.

That Q= π D b Vf.

Anyhow Vf is related to V and V is related to u and u =π D N /60.

So, Q is directly proportional to D^2.

(1)

Sekhar mullapudi said:
5 years ago

The discharge flow rate is directly proportional to its diameter.

But here the question is an only discharge of centrifugal pump; So the answer is "directly proportional to the square of the diameter".

So, the correct option C is correct.

But here the question is an only discharge of centrifugal pump; So the answer is "directly proportional to the square of the diameter".

So, the correct option C is correct.

Utsav said:
6 years ago

No, the Discharge of a centrifugal pump is Directly proportional to Impeller diameter.

You can refer to below-given affinity laws.

Q1/Q2 = D1/D2.

H1/H2 = (D1/D2)^2,

P1/P2 = (D1/D2)^3.

Q Indicates Flow that is discharged,

H Indicates Head,

P Indicates Power.

You can refer to below-given affinity laws.

Q1/Q2 = D1/D2.

H1/H2 = (D1/D2)^2,

P1/P2 = (D1/D2)^3.

Q Indicates Flow that is discharged,

H Indicates Head,

P Indicates Power.

(1)

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