The impeller of a centrifugal pump may have

Question

The impeller of a centrifugal pump may have

A. Volute casing

B. Volute casing with guide blades

C. Vortex casing

D. Any one of these

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The Thomson's turbine is __________ reaction turbine.

A. An axial flow

B. An inward flow

C. An outward flow

D. A mixed flow

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Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and η_o = Overall efficiency of the pump)

A. (w H_m) / (Q × η_o)

B. (w H_m Q) / η_o

C. (w Q) / (H_m × η_o)

D. (w Q η_o) / H_m

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In a centrifugal pump casing, the flow of water leaving the

A. Radial

B. Axial

C. Centrifugal

D. Vortex

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Dynamic 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. None of the above

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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 mechanical efficiency of an impulse turbine is

A. Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

B. Ratio of the actual work available at the turbine to the energy imparted to the wheel

C. Ratio of the Work done on the wheel to the energy of the jet

D. None of the above

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Braking jet in an impulse turbine is used

A. To break the jet of water

B. To bring the runner to rest in a short time

C. To change the direction of runner

D. None of these

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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 pump is successfully used for lifting water to the turbines?

A. Centrifugal pump

B. Reciprocating pump

C. Jet pump

D. Air lift pump

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If the ratio's of the corresponding forces acting at corresponding points 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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The specific speed (Ns) of a centrifugal pump is given by

A. (N√Q)/H^2/3

B. (N√Q)/H^3/4

C. (N√Q)/H

D. (N√Q)/H^5/4

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The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

A. 2V/(v_r - v)

B. 2V/(v_r + v)

C. V/(v_r - v)

D. V/(v_r + v)

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A Pelton wheel is

A. Tangential flow impulse turbine

B. Inward flow impulse turbine

C. Outward flow impulse turbine

D. Inward flow reaction turbine

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Pressure intensifier increases the pressure in proportion to

A. Ratio of diameters

B. Square of ratio of diameters

C. Inverse ratio of diameters

D. Square of inverse ratio of diameters

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Medium 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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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 speed of the wheel is

A. 10 r.p.m.

B. 20 r.p.m.

C. 40 r.p.m.

D. 80 r.p.m.

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The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump 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 axial flow at outlet

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The jet ratio is defined as the ratio of the

A. Diameter of jet to the diameter of Pelton wheel

B. Velocity of jet to the velocity of Pelton wheel

C. Diameter of Pelton wheel to the diameter of jet

D. Velocity of Pelton wheel to the velocity of jet

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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 cavitation in a hydraulic machine

A. Causes noise and vibration of various parts

B. Reduces the discharge of a turbine

C. Causes sudden drop in power output and efficiency

D. All of the above

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Air vessels in reciprocating pump are used to

A. Smoothen flow

B. Reduce acceleration to minimum

C. Increase pump efficiency

D. Save pump from cavitations

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Any change in load is adjusted by adjusting following parameter on turbine

A. Net head

B. Absolute velocity

C. Blade velocity

D. Flow

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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

Discuss this answer

For centrifugal pump impeller, the maximum value of the vane exit angle is

A. 10° to 15°

B. 15° to 20°

C. 20° to 25°

D. 25° to 30°

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The function of guide vanes in a reaction turbine is to

A. Allow the water to enter the runner without shock

B. Allow the water to flow over them, without forming eddies

C. Allow the required quantity of water to enter the turbine

D. All of the above

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The power developed by a turbine is (where H = Head of water under which the turbine is working)

A. Directly proportional to H^1/2

B. Inversely proportional to H^1/2

C. Directly proportional to H^3/2

D. Inversely proportional to H^3/2

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Centrifugal pump is started with its delivery valve

A. Kept fully closed

B. Kept fully open

C. Irrespective of any position

D. Kept 50% open

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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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Which place in hydraulic turbine is most susceptible for cavitations?

A. Inlet of draft rube

B. Blade inlet

C. Guide blade

D. Penstock

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Geometric 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

Discuss this answer

Accepted Answer

D. Any one of these

The impeller of a centrifugal pump may have

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The Thomson's turbine is __________ reaction turbine.

Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and η_o = Overall efficiency of the pump)

In a centrifugal pump casing, the flow of water leaving the

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

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

The mechanical efficiency of an impulse turbine is

Braking jet in an impulse turbine is used

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

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

If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

The specific speed (Ns) of a centrifugal pump is given by

The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

A Pelton wheel is

Pressure intensifier increases the pressure in proportion to

Medium specific speed of turbine implies it 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 speed of the wheel is

The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

The jet ratio is defined as the ratio of the

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

The cavitation in a hydraulic machine

Air vessels in reciprocating pump are used to

Any change in load is adjusted by adjusting following parameter on turbine

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

For centrifugal pump impeller, the maximum value of the vane exit angle is

The function of guide vanes in a reaction turbine is to

The power developed by a turbine is (where H = Head of water under which the turbine is working)

Centrifugal pump is started with its delivery valve

Head developed by a centrifugal pump depends on

Which place in hydraulic turbine is most susceptible for cavitations?

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

Also checkout

The impeller of a centrifugal pump may have

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

The Thomson's turbine is __________ reaction turbine.

Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

In a centrifugal pump casing, the flow of water leaving the

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

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

The mechanical efficiency of an impulse turbine is

Braking jet in an impulse turbine is used

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

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

If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

The specific speed (Ns) of a centrifugal pump is given by

The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by

A Pelton wheel is

Pressure intensifier increases the pressure in proportion to

Medium specific speed of turbine implies it 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 speed of the wheel is

The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

The jet ratio is defined as the ratio of the

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

The cavitation in a hydraulic machine

Air vessels in reciprocating pump are used to

Any change in load is adjusted by adjusting following parameter on turbine

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

For centrifugal pump impeller, the maximum value of the vane exit angle is

The function of guide vanes in a reaction turbine is to

The power developed by a turbine is (where H = Head of water under which the turbine is working)

Centrifugal pump is started with its delivery valve

Head developed by a centrifugal pump depends on

Which place in hydraulic turbine is most susceptible for cavitations?

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

Also checkout

Power required (in watts) to drive a centrifugal pump is (where H_m = Manometric head in metres, w = Specific weight in N/m³, Q = Discharge of the pump in m³/s, and η_o = Overall efficiency of the pump)