Which of the following pump is suitable for small discharge and high heads?

Question

Which of the following pump is suitable for small discharge and high heads?

A. Centrifugal pump

B. Axial flow pump

C. Mixed flow pump

D. Reciprocating pump

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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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Slip of a reciprocating pump is defined as the

A. Ratio of actual discharge to the theoretical discharge

B. Sum of actual discharge and the theoretical discharge

C. Difference of theoretical discharge and the actual discharge

D. Product of theoretical discharge and the actual discharge

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Runaway speed of a hydraulic turbine is

A. Full load speed

B. The speed at which turbine runner will be damaged

C. The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

D. The speed corresponding to maximum overload permissible

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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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The optimum value of vane exit angle for a centrifugal pump impeller is

A. 10-15°

B. 20-25°

C. 30-40°

D. 50-60°

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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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The depth of the bucket for a Pelton wheel is generally ________ the diameter of jet.

A. Equal to

B. 1.2 times

C. 1.8 times

D. Double

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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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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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In reaction turbine, draft tube is used

A. To transport water downstream without eddies

B. To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

C. For safety of turbine

D. To increase flow rate

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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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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 %

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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. The saving in case of a double acting reciprocating pump is

A. 39.2 %

B. 48.8 %

C. 84.8 %

D. 88.4 %

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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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The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

A. Delivers unit discharge under unit head

B. Delivers unit discharge under unit speed

C. Develops unit power under unit head

D. Develops unit power under unit speed

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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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Overall efficiency of a centrifugal pump is the ratio of

A. Energy available at the impeller to the energy supplied to the pump by the prime mover

B. Actual workdone by the pump to the energy supplied to the pump by the prime mover

C. Energy supplied to the pump to the energy available at the impeller

D. Manometric head to the energy supplied by the impeller per kN of water

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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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The discharge through a turbine is

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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The flow 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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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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In a centrifugal pump, the regulating valve is provided on the

A. Casing

B. Delivery pipe

C. Suction pipe

D. Impeller

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Delivery head of a centrifugal pump is

A. Directly proportional to N

B. Inversely proportional to N

C. Directly proportional to N²

D. Inversely proportional to N²

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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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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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According to fan laws, for the fans having constant wheel diameters, the power demand varies

A. Directly as fan speed

B. Square of fan speed

C. Cube of fan speed

D. Square root of fan speed

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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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One horsepower is equal to

A. 102 watts

B. 75 watts

C. 550 watts

D. 735 watts

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Head developed by a centrifugal pump is

A. Proportional to diameter of impeller

B. Proportional to speed of impeller

C. Proportional to diameter and speed of impeller

D. None of the above

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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

Discuss this answer

Accepted Answer

D. Reciprocating pump

Which of the following pump is suitable for small discharge and high heads?

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

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

Slip of a reciprocating pump is defined as the

Runaway speed of a hydraulic turbine is

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)

The optimum value of vane exit angle for a centrifugal pump impeller is

The cavitation in a hydraulic machine

The depth of the bucket for a Pelton wheel is generally ________ the diameter of jet.

Medium specific speed of turbine implies it is

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

In reaction turbine, draft tube is used

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

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

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

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

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

Which of the following is not a reaction turbine?

Overall efficiency of a centrifugal pump is the ratio of

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)

The discharge through a turbine is

The flow ratio in case of Francis turbine varies from

A Pelton wheel is

In a centrifugal pump, the regulating valve is provided on the

Delivery head of a centrifugal pump is

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

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

According to fan laws, for the fans having constant wheel diameters, the power demand varies

The Fourneyron turbine is _________ reaction turbine.

One horsepower is equal to

Head developed by a centrifugal pump is

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

Also checkout

Which of the following pump is suitable for small discharge and high heads?

Correct Answer :

Show all Hydraulics & Fluid Machineries MCQ

Related Questions

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

Slip of a reciprocating pump is defined as the

Runaway speed of a hydraulic turbine is

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)

The optimum value of vane exit angle for a centrifugal pump impeller is

The cavitation in a hydraulic machine

The depth of the bucket for a Pelton wheel is generally ________ the diameter of jet.

Medium specific speed of turbine implies it is

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

In reaction turbine, draft tube is used

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

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

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

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

The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which

Which of the following is not a reaction turbine?

Overall efficiency of a centrifugal pump is the ratio of

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)

The discharge through a turbine is

The flow ratio in case of Francis turbine varies from

A Pelton wheel is

In a centrifugal pump, the regulating valve is provided on the

Delivery head of a centrifugal pump is

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

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

According to fan laws, for the fans having constant wheel diameters, the power demand varies

The Fourneyron turbine is _________ reaction turbine.

One horsepower is equal to

Head developed by a centrifugal pump is

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

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)