# 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.
Prithvi singh said:
5 years ago

Q is directly proportional to D^3.

(4)

DebashisD said:
3 years ago

Discharge = Q * D * N.

(1)

Shaik Murtuza said:
4 years ago

Option A is the correct answer.

(1)

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)

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)

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.

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.

Pabitra said:
7 years ago

It should be diameter cube.

Pabitra said:
7 years ago

Q= 3.14 d b v = d^3 n so the correct answer will be d^3.

Muhammad Waqas said:
7 years ago

Q=πDb(V_f).

Where D=Diameter of impeller at inlet,

b=width of impeller at inlet,and

V_f=Velocity of flow at inlet.

Q=πDb(V_f).

Q=πDb(πDN/60).

Hence

Q is directly proportional to square of the diameter.

Where D=Diameter of impeller at inlet,

b=width of impeller at inlet,and

V_f=Velocity of flow at inlet.

Q=πDb(V_f).

Q=πDb(πDN/60).

Hence

Q is directly proportional to square of the diameter.

Kartheek said:
7 years ago

dicharge Q = pav, a= πd^2/4 so q is directly praporional to squre of diameter.

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