Consider the following statements:

1. The compressive strength of concrete decreases with increase in water-cement ratio of the concrete mix.

2. Water is added to the concrete mix for hydration of cement and workability.

3. Creep and shrinkage of concrete are independent of the water-cement ratio in the concrete mix.

The true statements are

A bracket connection is made with four bolts of $$10$$ $$mm$$ diameter and supports a load of $$10$$ $$kN$$ a an eccentricity of $$100$$ $$mm.$$ The maximum force to be resisted by any bolt will be

A steel flat of rectangular section of size $$70 \times 6\,\,mm$$ is connected to a gusset plate by three bolts each having a shear capacity of $$15$$ $$kN$$ in holes having diameter $$11.5$$ $$mm.$$ If the allowable tensile stress in the flat is $$150$$ $$MPa,$$ the maximum tension that can be applied to the flat is

The maximum and minimum shear stresses in a hollow circular shaft of outer diameter $$20$$ $$mm$$ and thickness $$2$$ $$mm,$$ subjected to a torque of $$92.7$$ $$N.m$$ will be