Fixing of iron rim to the wooden wheel of a cart involve s:
Cooling followed by heating
Heating followed by melting
Heating followed by cooling
Only heating
Fixing of iron rim to the wooden wheel of a cart involves heating followed by contraction on cooling.
In Change carts, the iron rim is usually heated before fixing to the wooden wheels, because on heating, the iron:-
Question 7
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim (a) expands and fits onto the wooden wheel (b) contracts and fits onto the wooden wheel (c) no change in the size take place (d) expands first, then on cooling contracts and fits onto the wooden wheel