Tennessee Wastewater Operator Practice Exam

What type of couplings are used to connect the shafts of multistage centrifugal blowers and their motors?

1. Rigid couplings

2. Flexible couplings

3. Universal couplings

4. Jaw couplings

The correct answer is: Flexible couplings

Flexible couplings are specifically designed to accommodate misalignments and vibrations between the shafts of multistage centrifugal blowers and their motors. In operations where equipment might experience slight shifts due to thermal expansion, foundational settling, or other factors, flexible couplings allow for some degree of movement while still effectively transmitting torque. This capability helps reduce wear on the components and prolongs the life of the machinery by protecting it from excessive stress. Furthermore, flexible couplings can absorb shocks and dampen vibrations, which is particularly valuable in high-speed applications typical of centrifugal blowers. Their ability to maintain alignment under varying conditions makes them an ideal choice for connecting the shafts in such contexts. While rigid couplings provide a strong connection, they do not accommodate misalignment and can lead to damage if the shafts are not perfectly aligned. Universal couplings offer flexibility but are not typically used in applications like blower and motor connections due to their design characteristics. Jaw couplings have their specific applications but may not provide the same level of versatility and alignment accommodation required in multistage centrifugal systems.