Lab 8 - Pump Characterization

Question 1

Fluid machines are separated into two categories:

Answer 1

positive displacement machines and

turbomachines

Question 2

Positive displacement machines

Answer 2

operate by forcing fluid into or out of a

chamber.

Question 3

Turbomachines

Answer 3

involve the flow of a fluid through rotating blades or rotors that either remove (turbines) or add (pumps) energy to the fluid

Question 4

How is pump applicability determined?

Answer 4

with a Pump Performance Curve. Performance Curves are specific to an
individual pump and are determined through experimentation.

Question 5

What is the purpose of the pump characterization lab?

Answer 5

The purpose of this exercise is to study the operation of a centrifugal pump and determine the performance curve for a centrifugal pump operating at variable speeds.

Question 6

What is the change in pressure mainly attributed to in Lab 8?

Answer 6

the rotary action(pressure increases outward) produces by the rotating impeller.

Question 7

What does a homologous series refer to?

Answer 7

a class of pumps that have the same shape (i.e. are geometrically similar)

Question 8

The power usage is monitored at the plug with a…?

Answer 8

Kill-A-Watt meter

Question 9

How is the pressure at the outflow measured?

Answer 9

a Bourdon type pressure gauge mounted on the panel of the hydraulics bench.

Question 10

What is the diameter of the outflow pipe

Answer 10

2.5 cm

Question 11

How is flow measured? (also for Lab 2)

Answer 11

Flow is measured with the sharp-crested v-notch weir at the end of the weir channel (L/min) and with the volumetric discharge tank and stopwatch (L/s).

Question 12

Where is the pressure tapping point?

Answer 12

18.5 cm above the bottom of the pump.