For a PIC16F877A Microcontroller to work, a crystal oscillators must be connected between pins 13 and 14.What is the frequency range in which PIC16F877A can operate?

Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.