Piscina de Bombeo: cuestionario

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Piscina de Bombeo: cuestionario


Piscina de Bombeo: cuestionarioVersión en línea Preguntas rápidas sobre bombas y tuberías por Eloy Bernal Martin 1 Which of the following pump tricks raise the head curve? a Underfilling b Sloping trimming c Vane cut back d Impeller trimming 2 What are the three main guide arrangements of a fluid flow machine? Escoge una o varias respuestas a Guide Pin b Diffusor with vanes c Spiral Casing d Inducer e Vaneless diffusor 3 You want to design an impeller with a specific speed of nq = 75. Which impeller design fits the most? a Radial impeller b Semi-axial impeller c Axial impeller 4 Please mark the answers, that may induce waterhammer. Escoge una o varias respuestas a Desired pump stop by shutdown by means of frequency converter b Pump stop due to stop of power supply c Slow throttling of the fluid flow d Quickly close or open of valves e Start or stop of pumps within a running system 5 What are numbers for model tests? Escoge una o varias respuestas a Froude b Weber c Reynolds d Bernoulli e Euler 6 What are main elements of a pumping station with dry pumps? Escoge una o varias respuestas a pump sump b control equipment c Inlet pipe d filter 7 For which impeller type do the velocity triangles shown apply? Please explain your answer in one sentence. a Axial b Radial 8 For which fluid does EN ISO 9906 guarantee its power values (if not otherwise agreed)? a Wastewater b Air c Clear water d Oil 9 What are typical centrifugal pumps? a Single-acting pumps b Positive displacement pumps c Chain pumps d Radial, axial, diagonal flow pumps 10 In which kind of diagram is a characteristic curve normally plotted? a Efficiency vs. RPM b P-v (electric power and velocity) c Y-NPSH (specific work over net positive suction head) d H-Q (head over capacity) 11 What are the properties of an ideal positive displacement pump? Escoge una o varias respuestas a The volume flow rate will not change regardless of the pressure b The volume flow rate will increase with the pressure c The pressure of the pump won’t exceed the designed maximum during operation. d Pressure relief valves are needed because of the unlimited pressure. 12 What are the five main components of a centrifugal pump? Escoge una o varias respuestas a Discharge flange b Bearing c Sealing d Impeller e Shaft f Casing 13 Please name the formula for the hydraulic Power with SI units. a P = ρ · Q · H b P = ρ · g · Q · H c P = m · a d P = Q · v 14 Which values usually form the guarantee point? a Capacity and Head b Power and Capacity c Head and Efficiency d Capacity and NPSH 15 What is the main objective when designing the sump geometry? Escoge una o varias respuestas a Large items have no space b Sediment must not accumulate within the sump c Stagnant regions or low-velocity areas must be avoided 16 What is the preferred angle of the berm design? a 45° b 35° c 90° d 15° 17 Which impeller type is typically used for wastewater transport? Escoge una o varias respuestas a Single-vane impeller b Open single channel impeller c Vortex impeller d Multi-vane impeller e Helical impeller 18 What measure should be considered with intake pipes to avoid air pockets? Escoge una o varias respuestas a Cross-section area should reduce uniformly in the direction of flow b Concentric acceleration pipe to avoid air pockets c Slight increase of height to avoid air pockets d Eccentric acceleration pipe to avoid air pockets e Cross-section area should reduce uniformly against the direction of flow f Slight decrease of height to avoid air pockets 19 What are the best measurement conditions for the flow rate? a Swirls induced by the installation b Unsymmetrical velocity distribution c Uniform static pressure distribution 20 Which action helps actively avoid cavitation? Escoge una o varias respuestas a Increase the diameter of the pressure pipe b Unify the velocity in the suction nozzle c Increase suction pressure d Reduce rotational speed (if possible) e Reduce the diameter of the suction pipe 21 What factor is preferred when choosing a sewage impeller? Escoge una o varias respuestas a Best efficiency b Best cover c Best functionality Explicación 16 60 for a lot of grase

Piscina de Bombeo: cuestionario

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Piscina de Bombeo: cuestionarioVersión en línea

por Eloy Bernal Martin

Which of the following pump tricks raise the head curve?

What are the three main guide arrangements of a fluid flow machine?

You want to design an impeller with a specific speed of nq = 75. Which impeller design fits the most?

Please mark the answers, that may induce waterhammer.

What are numbers for model tests?

What are main elements of a pumping station with dry pumps?

For which impeller type do the velocity triangles shown apply? Please explain your answer in one sentence.

For which fluid does EN ISO 9906 guarantee its power values (if not otherwise agreed)?

What are typical centrifugal pumps?

In which kind of diagram is a characteristic curve normally plotted?

What are the properties of an ideal positive displacement pump?

What are the five main components of a centrifugal pump?

Please name the formula for the hydraulic Power with SI units.

Which values usually form the guarantee point?

What is the main objective when designing the sump geometry?

What is the preferred angle of the berm design?

Which impeller type is typically used for wastewater transport?

What measure should be considered with intake pipes to avoid air pockets?

What are the best measurement conditions for the flow rate?

Which action helps actively avoid cavitation?

What factor is preferred when choosing a sewage impeller?