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Examen Termodinámica 1º evaluación
1º) Un local cuyas dimensiones sox 6x3x5 esta lleno de aire cuyo volumen especifico es 750 ltrs/Kg.calcular la masa de aire en kgs y su densidad en grs/dm3.
2º) calcular en mts/min la velocidad con la que circula un gas por una tuberia de 2” de diametro, sabiendo que el volumen horario es de 30 m3/h.Siendo su volumen especifico 100 dm3/kg, ¿cuál es su caudal de masa horario?
3º) Calcular el trabajo que debe realizar una bomba para elevar 50 m3 de agua a 20 mts, en kpms, julios, ergios.Hallar la potencia teorica si lo hace en 30 min. (Kw, kpm/sg y CV)
4º) Un cuerpo esta 50 mts bajo el agua.Que presion en bares, psi, atmosferas, Kpascales, Kp/cm3 ,mm columna de mercurio y mm de columna de agua.
5º) Transformar 20ºF en ºC, º R y ºK
6º) Calcular las presiones manometricas que tendriamos de los refrigerantes r-12, R-22, R-505 y 134ª.Con temperatura de condensacion +40 -20, Cual sera la relacion de compresion y rendimiento volumetrico en cada caso?
7º) En un manometro de agua abierto sometemos po uno de ellos a presion, la diferencia de alturas entre columnas es 90 cms. Cual es la presion en psi?
8º) Mezclamos 8 Kg de hielo a -20ºC con 4 Kg de agua a 100ºC.Calcula la temperatura de la mezcla,de equilibrio, estado y cantidad.
9º) Que es calor latente? Y calor sensible?Cuales son los calores sensible y latente del agua en sus diferentes estados? En que vienen dados?
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Enviado por: Dani Pastor Idioma: castellanoPaís: España