Q1: Consideration of the creep is the most important in case of the

ANS:A - blades of gas turbine.

Consideration of creep is most important in the case of blades of gas turbines. Explanation:

1. Gas Turbine Blades: Gas turbine blades operate under high temperatures and mechanical stresses due to the high-speed rotation and exposure to hot gases. Creep is the gradual deformation that occurs in materials subjected to prolonged stress at elevated temperatures. In gas turbines, the turbine blades experience high temperatures and mechanical loads, making them susceptible to creep deformation over time. Creep resistance is crucial for maintaining the dimensional stability and mechanical integrity of turbine blades during extended operation.
2. Piston of an I.C. Engine: While pistons in internal combustion engines also experience high temperatures and mechanical stresses, the operating conditions typically involve cyclic loading rather than sustained stress at elevated temperatures, which makes creep less of a concern compared to gas turbine blades.
3. Flywheel of Steam Engine: Flywheels in steam engines store rotational energy and undergo cyclic loading during operation. While creep may occur in flywheels subjected to high temperatures and stresses, the magnitude and duration of stresses are generally lower compared to gas turbine blades.
4. Cycle Chain: Cycle chains are subjected to cyclic loading during operation but are not typically exposed to high temperatures that would induce creep deformation.

In summary, gas turbine blades are most susceptible to creep deformation due to the combination of high temperatures and sustained mechanical stresses experienced during operation, making consideration of creep resistance crucial in their design and material selection.