The least count of a $$200$$ $$mm$$ long spirit level is given as $$10$$ seconds per division. The gradient of the spirit level expressed as $$mm$$ over one meter is _____________.

A hole is specified as $$\phi 30 \pm 0.04mm$$ with $$\phi \,\,0.01\,\,M.$$ The virtual diameter of the hole (i.e the maximum diameter of the pin that can enter the hole ) is ________________

The maximum interference in $$mm$$ after assembly between a bush of size $${30^{\matrix{ { + 0.06} \cr { + 0.03} \cr } }}$$ and a shaft of size $${30^{\matrix{ { + 0.04} \cr { - 0.02} \cr } }}$$ is

Holes $$1,2,3,4$$ drilled in sequence , with angular positions and tolerances are shown in Figure. Evaluate closing angle $$'X'$$ with its tolerance band.