Correct Answer - Option 4 : block type machine foundation
Concepts:
Machine foundations are required for machines, machine tools and heavy equipments These foundations are designed to resist the shocks and vibrations resulting from operation of machines.
Types of Machine Foundations:
1. Block Type Machine Foundation: It consists of a pedestal resting on a footing have has large mass and a small natural frequency.
2. Framed Type Machine Foundation: It consists of vertical columns with horizontal frame at their tops. It is used for larger machines. The machines are rested on the top of frames.
3. Wall Type Machine Foundation: It consists of a pair of walls with a slab resting on top. This type of foundation is constructed of homogeneous materials. It is used for small machines and the machine is rested on the top slab.
4. Box or Caisson Type Machine Foundation: It consists of a hollow concrete block. The mass of this foundation is less than block type machine foundation as it is hollow. The natural frequency of the box type machine foundation is increased.
