How we can check if geometry imported is good or not for meshing. what operations should we performed to fix it.

o After importing the any file in FW, please perform geometry check operation through Tools-->Geometry-->Check .
If you find geometrical errors reported there, then you can try repairing and smoothing it through Tools-->Geometry-->Repair or Tools-->Geometry-->Smooth.
Then check the geometry again. You may want to try the repair/smooth operations 4-5 times to see if geometrical problems are eliminated or not.