Cho động cơ một chiều kích thích song song: 9,36hp; 500v; 17,1A. Tcs độ định mức 1750 vòng/ phút, điện trở quấn dây kích thích 576 ohm, nội trở phần ứng là 1,48 omh. Tốc độ không tải lý tưởng của động cơ?

Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

The higher the astm grain size number, the finer the gran is. a)-true b)-false