The specific speed of a turbine is given by the equation

Question

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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The power produced by the reaction turbine is ________ to the head of water.

A. Directly proportional

B. Inversely proportional

C. 4th power

D. None of these

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By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

A. 39.2 %

B. 48.8 %

C. 84.8 %

D. 88.4 %

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A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

A. 0.25 kW

B. 0.75 kW

C. 1.75 kW

D. 3.75 kW

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When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

A. Horizontal

B. Nearly horizontal

C. Steep

D. First rise and then fall

Discuss this answer

One horsepower is equal to

A. 102 watts

B. 75 watts

C. 550 watts

D. 735 watts

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Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

A. 39.2 %

B. 49.2 %

C. 68.8 %

D. 84.8 %

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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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Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

A. Directly proportional to N

B. Inversely proportional to N

C. Directly proportional to N²

D. Inversely proportional to N²

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The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is

A. 1/√2

B. 1/2

C. 1

D. √2

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According to fan laws, at constant pressure, the speed capacity and power vary

A. Directly as the air or gas density

B. Inversely as square root of density

C. Inversely as density

D. As square of density

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In axial flow fans and turbines, fluid enters and leaves as follows

A. Radially, axially

B. Axially, radially

C. Axially, axially

D. Radially, radially

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The discharge through a reaction turbine ________ with the increase in unit speed.

A. Decreases

B. Increases

C. Remain same

D. None of these

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The cavitation in reaction turbines is avoided, to a great extent by

A. Installing the turbine below the tail race level

B. Using stainless steel runner of the turbine

C. Providing highly polished blades to the runner

D. All of the above

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In an outward flow reaction turbine

A. The water flows parallel to the axis of the wheel

B. The water enters at the centre of the wheel and then flows towards the outer periphery of the wheel

C. The water enters the wheel at the outer periphery and then flows towards the centre of the wheel

D. The flow of water is partly radial and partly axial

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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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Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

A. Lift and resultant force

B. Drag and resultant force

C. Lift and tangential force

D. Lift and drag

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The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

A. L.A.N

B. 2 L.A.N

C. (L.A.N)/60

D. (2 L.A.N)/60

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A hydraulic coupling belongs to the category of

A. Power absorbing machines

B. Power developing machines

C. Energy transfer machines

D. Energy generating machines

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Reaction turbines are used for

A. Low head

B. High head

C. High head and low discharge

D. Low head and high discharge

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Which of the following pump is preferred for flood control and irrigation applications?

A. Centrifugal pump

B. Axial flow pump

C. Mixed flow pump

D. Reciprocating pump

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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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A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

A. Pelton wheel with one nozzle

B. Pelton wheel with two or more nozzles

C. Kaplan turbine

D. Francis turbine

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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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High specific speed of turbine implies it is

A. Propeller turbine

B. Francis turbine

C. Impulse turbine

D. None of the above

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The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

A. Slow speed pump with radial flow at outlet

B. Medium speed pump with radial flow at outlet

C. High speed pump with radial flow at outlet

D. High speed pump with axial flow at outlet

Discuss this answer

High specific speed of a pump implies it is

A. Centrifugal pump

B. Mixed flow pump

C. Axial flow pump

D. Any one of the above

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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 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

Discuss this answer

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

A. Kinetic head

B. Velocity head

C. Manometric head

D. Static head

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The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

A. 40 %

B. 50 %

C. 60 %

D. 80 %

Discuss this answer

Accepted Answer

C. N√P / H^5/4

The specific speed of a turbine is given by the equation

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The power produced by the reaction turbine is ________ to the head of water.

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

One horsepower is equal to

Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

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

Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is

According to fan laws, at constant pressure, the speed capacity and power vary

In axial flow fans and turbines, fluid enters and leaves as follows

The discharge through a reaction turbine ________ with the increase in unit speed.

The cavitation in reaction turbines is avoided, to a great extent by

In an outward flow reaction turbine

Casting of a centrifugal pump is designed so as to minimize

Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

A hydraulic coupling belongs to the category of

Reaction turbines are used for

Which of the following pump is preferred for flood control and irrigation applications?

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

A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

Discharge of a centrifugal pump is

High specific speed of turbine implies it is

The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

High specific speed of a pump implies it is

In a reaction turbine, the draft tube is used

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

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

Also checkout

The specific speed of a turbine is given by the equation

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The power produced by the reaction turbine is ________ to the head of water.

By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is

A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is

When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

One horsepower is equal to

Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of

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

Discharge of a centrifugal pump is (where N = Speed of the pump impeller)

The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is

According to fan laws, at constant pressure, the speed capacity and power vary

In axial flow fans and turbines, fluid enters and leaves as follows

The discharge through a reaction turbine ________ with the increase in unit speed.

The cavitation in reaction turbines is avoided, to a great extent by

In an outward flow reaction turbine

Casting of a centrifugal pump is designed so as to minimize

Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between

The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

A hydraulic coupling belongs to the category of

Reaction turbines are used for

Which of the following pump is preferred for flood control and irrigation applications?

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

A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

Discharge of a centrifugal pump is

High specific speed of turbine implies it is

The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

High specific speed of a pump implies it is

In a reaction turbine, the draft tube is used

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

A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the

The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

Also checkout

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