Test
3.13 Pump head calculations
Preguntas del test (10)
1A pump is sitting at rest with its discharge valve open and the pressure gauge showing 210 kPa. The total static head of the pump in this situation is 11m. If the pump takes suction from a transfer tank located 4m above it, what is the current level in the transfer tank? The liquid is water at 42 deg C.
- A6.5m
- B7.2m
- C5.2m
- D6.42m
2An open, cylindrical tank contains a liquid to a height of 10 metres. If the density of the liquid is 4.0 x 103 kg/m3. what is the pressure exherted by the liquid at the bottom of the tank in kpa
- A331
- B392
- C259
- D400
3__________ happens when the pressure, at any point inside a centrifugal pump, drops below the vapour pressure of the liquid, vapour bubbles will form, creating cavities in the liquid flow.
- Acavitation
- Bsurging
- Cpriming
- Dchirping
4An open, cylindrical tank contains a liquid to a height of 7.5 metres, if the density of the liquid is 4.5 x 103 kg/m3 what is the pressure exerted by the liquid at the bottom of the tank in kPa?
- A331
- B352
- C250
- D400
5A boiler feedwater pump is to supply water from a boiler at 110 deg C. according to the manufacturer, this pump must have a minimum suction pressure of 210 kPa to ensure the required NPSH is maintained. What value of NPSH has been specified by the manufacturer?
- A10m
- B8m
- C7.15m
- D6.25m
6What is the velocity in the discharge of a centrifugal pump if the velocity head is 12 m?
- A7.34m
- B6.25m
- C8.1m
- D15.34m
7A liquid with a vapour pressure of 110 kPa and density of 840 kg/m3 is moved by a pump that has a NPSH of 6m. How much pressure must exist at the pump suction?
- A134.45kPa
- B125.87kPa
- C145.23kPa
- D159.44kPa
8The pressure at the discharge of a water pump is 150kPa and the temperature of the water is 80 deg C. Find the equivalent head in metres.
- A20.21
- B12.55
- C18
- D15.73
9What is the dynamic suction head for a pump that has a static suction head = 8m, suction pressure head = 12m, suction friction head =2m, and suction velocity head =3m
- A15m
- B22m
- C17m
- D12m
10If a column of mercury has an equivalent head of 50cm. calculate the pressure produced at the bottom of the column in kPa. Relative density of mercury is 13.6
- A66.7
- B73.4
- C81.24
- D55
Información
- Descripción
- Test sobre 3.13 Pump head calculations, creado por TRAVIS CANNING el 29/01/2016.
- Autor
- TRAVIS CANNING
- Idioma
- English
- Visitas
- 327
- Historial
- Creado el 29 ene 2016 · actualizado el 15 oct 2016
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