18) Anodizing is the most commonly applied surface treatment for the alloys of

19) For a cemented carbide turning tool, Tailor's tool life exponent is 0.25. If the cutting speed halved, the tool life will increase by

20) For the same maximum pressure and heat input, the maximum air standard efficiency is for

21) A ball is dropped from a height of 10 m on a smooth floor and after the impact the ball bounces to a height of 2.5 m. The coefficient of restitution between the ball and the floor is

22) When the state is being changed from gas to liquid through the process of condensation, the temperature?