Suppose that a ring oscillator contains 301 inverters and the average propogation delay of an inverter is 100 ps. what will be the period of the square wave generated by the oscillator? (b) what is the frequency of oscillator? (c) why should the number of inverters be odd? what could happen if an even number of inverters were used in the ring oscillator?

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?