Cho sơ đồ chỉnh lưu thyristor ba pha, kiểu tia . Mach tải gồm điện trở R nối tiếp với điện cảm L. Nguồn điện áp xoay chiều có trị hiệu đụng điện áp pha U-220v/50Hz, R = 40, a = 80°. Hãy tính xem L phải bằng bao nhiêu để thiết bị chỉnh lưu làm việc trên ranh giới giữa dòng liên tục và dòng gián đoạn.

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.