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White cast iron__________________? A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast ironB. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable C. is produced by annealing process. It is soft, tough and easily machined metal D….
Pipes for bicycle frames are made of___________________? A. cold rolled steel B. hot rolled steel C. forged steel D. cast steel E. carbon-chrome steel
Heavy duty leaf and coil spring* contain carbon of the following order ________________? A. 0.2% B. 0.5% C. 0.8%D. 1.0% E. 1.5%.
Drop forging dies contain carbon of the order of_________________? A. 0.1 to 0.2% B. 0.25 to 0.5%C. 0.6 to 0.7% D. 0.7 to 0.9% E. 1.0 to 1.2%.
The tensile strength of wrought iron is maximum _________________? A. along the lines of slag distribution B. perpendicular to lines of slag distribution C. uniform in all directions D. unpredictable E. none of the above
Preheating is essential in welding ___________________? A. cast iron B. high speed steel C. all non-ferrous materials D. all of the above E. none of the above
Balls for ball bearings are made of_________________? A. cast iron B. mild steel C. stainless steelD. carbon-chrome steel E. high carbon steel
Which is the false statement about wrought iron. It has________________? A. high resistance to rusting and corrosion B. high ductility C. ability of hold protective coating D. easily weldable characteristicsE. uniform strength in all directions
Taps, dies and drills contain carbon________________? A. below 0.5% B. below 1%C. above 1% D. above 2.2% E. nil
Large forgings, crank shafts, axles normally contain carbon up to________________? A. 0.05 to 0.20% B. 0.20 to 0.45%C. 0.45 to 0.55% D. 0.55 to 1.0% E. 1.0 to 1.2%.