What is the advabtage and disadvabtage?

What is decalage on a bi-plane? Differentiate between open channel flow and pipe flow? Who invented iron lung? Where can i find brushes for robbins Myers e586 motor? What is BNF for switch case? What is the difference between base class pointer and derived class pointer in c plus plus? This a prewritten function that is built into a programming language? What relationship would to use where one record in a table is related to many records in another case? What did Richard Arkwright invent and when did he invent it? Name something you might see in a bank? Would you expect to find an alternating or direct current in the secondary coil of a transformer? What is the Model View Controller Design Pattern? What is the margin of safety and why is it important in disining structures? Why cast iron is more brittle than steel? Difference between Country of manufacture and country of origin? Why zener diode acts as a reference element in the voltage regulator circuit? Is all software developed by a programming language? Can you connect three phase AC voltage directly to motor? Does a step down converter also change the frequency? What is the code for horror land elevator?