Chọn dao và xác định chế độ cắt (chiều sâu cắt, lượng tiến dao, tốc độ trục chính) khi gia công tiện CNC để tiện ngoài phôi bằng gang đúc (cứng), lượng dư
gia công 1.5 + 0.1 x N (mm), (N là số thứ tự của nhóm), độ nhám bề mặt đạt được
sau khi gia công Ra = 2.5 mm, đường kính của phôi là 60 mm

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Prove the equivalence between the two statements of the 2nd law of thermodynamics (i.e., a violation of one statement leads to the violatio the other statement)

What is the main objective of using reheat rankine cycle?