A. It stands irregular strains and sudden shocks better.
Q. What are the principal defects found in boiler iron?
A. Imperfect welding, brittleness, low ductility.
Q. What are the advantages of steel as a material for boiler plates?
A. Homogeneity, tensile strength, malleability, ductility and freedom from laminations and blisters.
Q. What are the disadvantages of steel as a material for boiler plates?
A. It requires greater skill in working than iron, and has, as bad qualities, brittleness, low ductility and flaws induced by the pressure of gas bubbles in the ingot.
Q. When would you oil an engine?
A. Before starting it and as often while running as necessary.
Q. How do you find proper size of any stay bolts for a well made boiler?