Discharge of a centrifugal pump is

Question

Discharge of a centrifugal pump is

A. Directly proportional to diameter of its impeller

B. Inversely proportional to diameter of its impeller

C. Directly proportional to (diameter)² of its impeller

D. Inversely proportional to (diameter)² of its impeller

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The hydraulic efficiency of a reaction turbine, is the ratio of

A. Power produced by the turbine to the energy actually supplied by the turbine

B. Actual work available at the turbine to energy imparted to the wheel

C. Workdone on the wheel to the energy (or head of water) actually supplied to the turbine

D. None of the above

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In a Francis turbine runner, the numbers of blades are generally between

A. 2 to 4

B. 4 to 8

C. 8 to 16

D. 16 to 24

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A hydraulic accumulator is a device used to store ________ energy which may be supplied to a machine later on.

A. Strain

B. Pressure

C. Kinetic

D. None of these

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Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

A. Q = π.D.Vf

B. Q = π.b.Vf

C. Q = π.D.bf.V

D. Q = D.b.Vf

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For small discharge at high pressure, following pump is preferred

A. Centrifugal

B. Axial flow

C. Mixed flow

D. Reciprocating

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Low specific speed of a pump implies it is

A. Centrifugal pump

B. Mixed flow pump

C. Axial flow pump

D. None of the above

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The specific speed of a turbine is given by the equation

A. N√P / H^3/2

B. N√P / H²

C. N√P / H^5/4

D. N√P / H³

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If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

A. Geometric similarity

B. Kinematic similarity

C. Dynamic similarity

D. None of these

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In centrifugal pumps, maximum efficiency is obtained when the blades are

A. Straight

B. Bent forward

C. Bent backward

D. Radial

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Which of the following is not an impulse turbine?

A. Girad turbine

B. Turgo turbine

C. Pelton wheel

D. Kaplan turbine

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Which of the following turbine is preferred for 0 to 25 m head of water?

A. Pelton wheel

B. Kaplan turbine

C. Francis turbine

D. None of these

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Which of the following is not a reaction turbine?

A. Fourneyron turbine

B. Journal turbine

C. Thomson's turbine

D. Pelton wheel

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Low specific speed of turbine implies it is

A. Propeller turbine

B. Francis turbine

C. Impulse turbine

D. Any one of the above

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The speed ratio in case of Francis turbine varies from

A. 0.15 to 0.3

B. 0.4 to 0.5

C. 0.6 to 0.9

D. 1 to 1.5

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The flow ratio of Francis turbine is defined as the ratio of the

A. Velocity of flow at inlet to the theoretical jet velocity

B. Theoretical velocity of jet to the velocity of flow at inlet

C. Velocity of runner at inlet to the velocity of flow at inlet

D. None of the above

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Casting of a centrifugal pump is designed so as to minimize

A. Friction loss

B. Cavitations

C. Static head

D. Loss of kinetic energy

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The relation between hydraulic efficiency (η_h), mechanical efficiency (η_m) and overall efficiency (η_o) is

A. η_h = η_o × η_m

B. η_m = η_m × η_h

C. η_o = η_h × η_m

D. None of these

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In a reaction turbine, the draft tube is used

A. To run the turbine full

B. To prevent air to enter the turbine

C. To increase the head of water by an amount equal to the height of the runner outlet above the tail race

D. To transport water to downstream

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The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

A. 24.8 r.p.m.

B. 48.2 r.p.m

C. 82.4 r.p.m.

D. 248 r.p.m

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The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

A. Slow speed with radial flow at outlet

B. Medium speed with radial flow at outlet

C. High speed with radial flow at outlet

D. High speed with mixed flow at outlet

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Which of the following pump is successfully used for lifting water to the boilers?

A. Centrifugal pump

B. Reciprocating pump

C. Jet pump

D. Airlift pump

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The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

A. (1 + cos φ)/2

B. (1 - cos φ)/2

C. (1 + sin φ)/2

D. (1 - sin φ)/2

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Which of the following statement is correct?

A. The centrifugal pump is suitable for large discharge and smaller heads.

B. The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.

C. The efficiency of centrifugal pump is less as compared to reciprocating pump.

D. All of the above

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Kinematic similarity is said to exist between the model and the prototype, if both of them

A. Have identical velocities

B. Are equal in size and shape

C. Are identical in shape, but differ only in size

D. Have identical forces

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The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

A. [2(V_r - v) v]/ V_r²

B. 2(V_r + v) v]/ V_r²

C. [(V_r - v) v]/ V_r

D. [(V_r + v) v]/ V_r

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Head developed by a centrifugal pump depends on

A. Impeller diameter

B. Speed

C. Fluid density

D. Both (A) and (B) above

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The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Crosssectional area of jet in m², and V = Velocity of jet in m/s)

A. waV / 2g

B. waV / g

C. waV² / 2g

D. waV² / g

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Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

A. Hydraulic ram

B. Hydraulic intensifier

C. Hydraulic torque converter

D. Hydraulic accumulator

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The Fourneyron turbine is _________ reaction turbine.

A. An axial flow

B. An inward flow

C. An outward flow

D. A mixed flow

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The gross or total head of the turbine is the ________ of the water levels at the head race and tail race.

A. Sum

B. Difference

C. Product

D. None of these

Discuss this answer

Accepted Answer

D. Inversely proportional to (diameter)² of its impeller

Discharge of a centrifugal pump is

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The hydraulic efficiency of a reaction turbine, is the ratio of

In a Francis turbine runner, the numbers of blades are generally between

A hydraulic accumulator is a device used to store ________ energy which may be supplied to a machine later on.

Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

For small discharge at high pressure, following pump is preferred

Low specific speed of a pump implies it is

The specific speed of a turbine is given by the equation

If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

In centrifugal pumps, maximum efficiency is obtained when the blades are

Which of the following is not an impulse turbine?

Which of the following turbine is preferred for 0 to 25 m head of water?

Which of the following is not a reaction turbine?

Low specific speed of turbine implies it is

The speed ratio in case of Francis turbine varies from

The flow ratio of Francis turbine is defined as the ratio of the

Casting of a centrifugal pump is designed so as to minimize

The relation between hydraulic efficiency (η_h), mechanical efficiency (η_m) and overall efficiency (η_o) is

In a reaction turbine, the draft tube is used

The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

Which of the following pump is successfully used for lifting water to the boilers?

The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

Which of the following statement is correct?

Kinematic similarity is said to exist between the model and the prototype, if both of them

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

Head developed by a centrifugal pump depends on

The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Crosssectional area of jet in m², and V = Velocity of jet in m/s)

Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

The Fourneyron turbine is _________ reaction turbine.

The gross or total head of the turbine is the ________ of the water levels at the head race and tail race.

Also checkout

Discharge of a centrifugal pump is

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The hydraulic efficiency of a reaction turbine, is the ratio of

In a Francis turbine runner, the numbers of blades are generally between

A hydraulic accumulator is a device used to store ________ energy which may be supplied to a machine later on.

Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

For small discharge at high pressure, following pump is preferred

Low specific speed of a pump implies it is

The specific speed of a turbine is given by the equation

If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

In centrifugal pumps, maximum efficiency is obtained when the blades are

Which of the following is not an impulse turbine?

Which of the following turbine is preferred for 0 to 25 m head of water?

Which of the following is not a reaction turbine?

Low specific speed of turbine implies it is

The speed ratio in case of Francis turbine varies from

The flow ratio of Francis turbine is defined as the ratio of the

Casting of a centrifugal pump is designed so as to minimize

The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is

In a reaction turbine, the draft tube is used

The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is

The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

Which of the following pump is successfully used for lifting water to the boilers?

The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)

Which of the following statement is correct?

Kinematic similarity is said to exist between the model and the prototype, if both of them

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

Head developed by a centrifugal pump depends on

The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Crosssectional area of jet in m², and V = Velocity of jet in m/s)

Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?

The Fourneyron turbine is _________ reaction turbine.

The gross or total head of the turbine is the ________ of the water levels at the head race and tail race.

Also checkout

The relation between hydraulic efficiency (η_h), mechanical efficiency (η_m) and overall efficiency (η_o) is