15 Questions
What are the only moving parts of a centrifugal pump?
Impeller and shaft
What is the function of pump bearings?
To support the impeller
What type of bearings are typically used by pumps?
Shell (sleeve) bearings
How are most centrifugal pumps driven?
By electric motors
What is required for the pump and motor shafts to be coupled together for direct drive?
Shafts to be perfectly aligned
Why is perfect alignment difficult to maintain during operation?
Due to alignment changes under load
What does Figure 15(a) illustrate?
Angular misalignment
What can cause misalignments of shafts connected by rigid couplings?
Poor installation or assembly
What is one of the main problems contributing to misalignment according to the text?
Bearing wear
What can flexible couplings compensate for during operation?
Misalignment due to poor installation
Why do some equipment intentionally misalign at installation?
Due to temperature changes during operation
What method is suitable for all types of couplings to accurately align shafts?
Micrometer dial indicators
What is the standard industry practice for measuring misalignment?
Laser alignment
What can be used to transmit precise laser measurements to a hand-held computer during laser alignment?
Shaft-mounted components
What is used to calculate the misalignment and show where to shim the motor during laser alignment?
"Hand-held computer"
This quiz covers the components and types of bearings used in centrifugal pumps, with a focus on the shaft support and minimal friction. It also touches on the specific types of bearings used, such as shell (sleeve) bearings and antifriction bearings.
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