Engineering Materials
In which of the following cases, consideration of creep is important

Cast iron pipes
Cycle chains
Flywheel of steam engine
Gas turbine blades

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Engineering Materials
In spheroidising process, the steel is

Heated below the lower critical temperature and then cooled slowly
Heated up to the lower critical temperature and then cooled in still air
None of these
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

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Engineering Materials
Y-alloy contains

5 to 6% tin, 2 to 3% copper and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

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