If a full bridge isolated dc‐dc converter is used for a power supply application while input is 300 v~ 400v, and output voltage is 48 v, and the transformer conversion ratio is 4: 1, what is the duty cycle range of the full bridge converter for the output voltage?

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

What is a monomer? how do they form a ploymer from the view point of chemical bonding?

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?