Which type of motor mount is commonly used for most fractional HP motors in central electric furnaces?

The correct choice is resilient mounted because this type of motor mount is specifically designed to absorb vibrations and provide flexibility, which is crucial for the operation of fractional horsepower motors found in central electric furnaces. Resilient mounts help reduce noise and prolong the life of the motor by minimizing stress caused by vibration during operation.

In central electric furnaces, where motors typically run continuously, it’s important to protect them from excessive vibration that could lead to mechanical failures or operational inefficiencies. Resilient mounts achieve this by using materials such as rubber or elastomers, which can dampen vibrations that would otherwise transfer to the motor and the surrounding structure.

The other types of mounts, while having their own applications, do not provide the same level of vibration absorption as the resilient mount. Rigid mounts are more suited for situations where maximum stability is required, while adjustable mounts offer flexibility in positioning but may not effectively absorb vibrations during operation. Fixed mounts provide a stable installation but can transmit vibrations directly without dampening, which is less than ideal for electric furnaces that rely on fractional horsepower motors.