Un transformador trifásico de 15200/380volt posee una impedancia de línea (20 +j50) Ω referida al primario, considerando despreciables las ramas de magnetización en paralelo. El transformador se conecta en configuración delta estrella aterrizado. El transformador alimenta una carga conectada en estrella cullo valor es de 2.5/25Ω por fase, considerando el voltaje de fase en la carga es de 220 volt, en secuencia positiva. Determine a) Corriente del secundario y corriente en primario del transformador

b) Regulación de tensión.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.