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Quiz am 3.13 Pump head calculations, erstellt von TRAVIS CANNING am 29/01/2016.

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3.13 Pump head calculations

Frage 1 von 10

1

A 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.

Wähle eine der folgenden:

  • 6.5m

  • 7.2m

  • 5.2m

  • 6.42m

Erklärung

Frage 2 von 10

1

An 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

Wähle eine der folgenden:

  • 331

  • 392

  • 259

  • 400

Erklärung

Frage 3 von 10

1

__________ 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.

Wähle eine der folgenden:

  • cavitation

  • surging

  • priming

  • chirping

Erklärung

Frage 4 von 10

1

An 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?

Wähle eine der folgenden:

  • 331

  • 352

  • 250

  • 400

Erklärung

Frage 5 von 10

1

A 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?

Wähle eine der folgenden:

  • 10m

  • 8m

  • 7.15m

  • 6.25m

Erklärung

Frage 6 von 10

1

What is the velocity in the discharge of a centrifugal pump if the velocity head is 12 m?

Wähle eine der folgenden:

  • 7.34m

  • 6.25m

  • 8.1m

  • 15.34m

Erklärung

Frage 7 von 10

1

A 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?

Wähle eine der folgenden:

  • 134.45kPa

  • 125.87kPa

  • 145.23kPa

  • 159.44kPa

Erklärung

Frage 8 von 10

1

The 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.

Wähle eine der folgenden:

  • 20.21

  • 12.55

  • 18

  • 15.73

Erklärung

Frage 9 von 10

1

What 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

Wähle eine der folgenden:

  • 15m

  • 22m

  • 17m

  • 12m

Erklärung

Frage 10 von 10

1

If 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

Wähle eine der folgenden:

  • 66.7

  • 73.4

  • 81.24

  • 55

Erklärung