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1. A 240-V series motor has an armature resistance of 0.42 Q and a series-field resistance of 0.18 Q. If the speed is 500 r/min when the current is 36 A, what will be the motor speed when the load reduces the line current to 21 A? (Assume a 3-V brush drop and that the flux is proportional to the current.)
2. A 220-V DC shunt motor has an armature resistance of 0.2 Q and a rated armature current of 50 A. Find a. The voltage generated in the armature. b. The power developed.
3. A 550-V series motor takes 112 A and operates at 820 r/min when the load is 75 hp. If the effective Ra = 0.1 Q Rf = 100 Q When running at 1,100 r/min with no load connected to the shaft, the motor draws 4 A from the line. Find E and the rotational losses at 1,100 r/min (assuming that the stray-load losses can be neglected).
a wad of clay mass m1 with an initial horizontal velocity v1 hits and adheres to the massless rigid bar which supports
Given water h=3227 KJ/Kg Temperature 400C Find specific volume, pressure, and specific internal energy. Given R-134a T=15F quality x =0.6 Find pressure, specific volume, specific enthalpy. Given Water P=4Mpa U=3000 KJ/Kg Find Temperature, and specifi..
Plot the pressure gradient as a function of tube diameter for the three flow rates. Assume the tube wall is smooth.
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Use the bisection method to determine the drag coefficient (cd) needed so that a 80 kg bunjee jumper has a velocity of 36 m/s after 4 s of free fall.
you are interested in determination of a steady state temperature profiles in a cylinder conducting the electrical
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A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3 /min. Determine the mass flow rate of air through the fan at an elevation on 3400 m, where the air density is 0.7 kg/m3. The diameter of the casing of the fan, if the average velo..
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