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Fluid-mechanics Questions Set 72:

Quiz Mode

Axial thrust is zero in

Screw pump

Axial flow pump

Vane pump

Lobe pump

Solution:

Correct option for the specific speed of pump is:

(N√Q)/H^5/4

(N√Q)/H^3/4

(N√Q)/H^5/4

(N√Q)/H^7/4

Solution:

If H is the unit head, the unit power of the turbine is proportional to

H^-2

H^-(1/2)

H^-(3/2)

Solution:

Pumps are connected in parallel to increase the

velocity head

pressure head

total head

discharge

Solution:

Slip in the case of a centrifugal pump.

Reduces the flow rate

Reduce the tangential

Reduces the speed

Increases cavitation

Solution:

For high discharge and low head such as irrigation, the type of pump preferred is

centrifugal pump

reciprocating pump

propeller pump

gear pump

Solution:

A diffuser blade in the centrifugal pump is used to

convert mechanical energy to kinetic energy

convert kinetic energy to pressure energy

convert pressure energy to kinetic energy

convert potential energy to kinetic energy

Solution:

Two centrifugal pumps 'A' operate at their maximum efficiencies at 2000 rpm and 1000 rpm respectively. Against the same delivery head, pump 'A' discharge 2 m3 /s and pump B discharge 8m3 /s respectively. What is the ratio of specific speeds (Ns)A : (Ns)B?

1:1

1:2

1:4

4:1

Solution:

Consider the following statements:
1. The specific speed of a two-stage centrifugal pump is twice that of a single-stage pump
2. The specific speed of a double-end suction pump is half that of a single-end suction pump.
3. The specific speed is not a dimensionless number

1, 2 and 3

1 only

2 only

3 only

Solution:

Which of the following is correct for centrifugal pumps?

Constant efficiency curve is obtained by using manometric head versus discharge curve for different speed and overall efficiency versus discharge curve for different speed

Constant efficiency curve is obtained by using input power versus discharge curve for different speed and overall efficiency versus discharge curve for different speed

Constant efficiency curve is obtained by combining input power versus discharge curve for different speed and head versus discharge curve for different speed

For pumps connected in series, the total discharge capacity will be the sum of individual discharge capacity

For pumps connected in parallel, the total head developed will be the sum of individual head developed by each pump

Fluid-mechanics Questions Set 72:

Axial thrust is zero in

Solution:

Correct option for the specific speed of pump is:

Solution:

If H is the unit head, the unit power of the turbine is proportional to

Solution:

Pumps are connected in parallel to increase the

Solution:

Slip in the case of a centrifugal pump.

Solution:

For high discharge and low head such as irrigation, the type of pump preferred is

Solution:

A diffuser blade in the centrifugal pump is used to

Solution:

Two centrifugal pumps 'A' operate at their maximum efficiencies at 2000 rpm and 1000 rpm respectively. Against the same delivery head, pump 'A' discharge 2 m3 /s and pump B discharge 8m3 /s respectively. What is the ratio of specific speeds (Ns)A : (Ns)B?

Solution:

Consider the following statements:
1. The specific speed of a two-stage centrifugal pump is twice that of a single-stage pump
2. The specific speed of a double-end suction pump is half that of a single-end suction pump.
3. The specific speed is not a dimensionless number

Solution:

Which of the following is correct for centrifugal pumps?

Solution:

Related Question Sets:

Related Topics:

Fluid-mechanics Questions Set 72:

Axial thrust is zero in

Solution:

Correct option for the specific speed of pump is:

Solution:

If H is the unit head, the unit power of the turbine is proportional to

Solution:

Pumps are connected in parallel to increase the

Solution:

Slip in the case of a centrifugal pump.

Solution:

For high discharge and low head such as irrigation, the type of pump preferred is

Solution:

A diffuser blade in the centrifugal pump is used to﻿

Solution:

Two centrifugal pumps 'A' operate at their maximum efficiencies at 2000 rpm and 1000 rpm respectively. Against the same delivery head, pump 'A' discharge 2 m3 /s and pump B discharge 8m3 /s respectively. What is the ratio of specific speeds (Ns)A : (Ns)B?

Solution:

Consider the following statements:1. The specific speed of a two-stage centrifugal pump is twice that of a single-stage pump 2. The specific speed of a double-end suction pump is half that of a single-end suction pump. 3. The specific speed is not a dimensionless number

Solution:

Which of the following is correct for centrifugal pumps?

Solution:

Related Question Sets:

Related Topics:

A diffuser blade in the centrifugal pump is used to

Consider the following statements:
1. The specific speed of a two-stage centrifugal pump is twice that of a single-stage pump
2. The specific speed of a double-end suction pump is half that of a single-end suction pump.
3. The specific speed is not a dimensionless number