SHYAM METALICS AND ENERGY Engineer Trainee Interview Questions and Answers

The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.

• Entropy in a closed system tends to increase over time

• Heat energy naturally flows from hot to cold objects

• Efficiency of energy conversion processes is limited by the second law of thermodynamics

Creep is the slow, time-dependent deformation of a material under constant load, while fatigue is the weakening of a material due to repeated loading and unloading.

• Creep is a time-dependent phenomenon, while fatigue is a cyclic phenomenon.

• Creep occurs at high temperatures and constant stress, while fatigue occurs at lower temperatures and varying stress levels.

• Creep leads to permanent deformation, while fatigue can lead to crack initiation and propagation.

• Examples of creep in...read more

The critical temperature of steel is the temperature at which it loses its magnetic properties.

• The critical temperature of steel is around 770°C (1420°F).

• Above this temperature, steel becomes non-magnetic and undergoes a phase change.

• The critical temperature varies depending on the type of steel and its composition.

Types of steel include carbon steel, alloy steel, stainless steel, and tool steel. They can be differentiated based on their composition, properties, and applications.

• Carbon steel contains primarily carbon and iron, with low amounts of other elements. It is commonly used in construction and manufacturing.

• Alloy steel contains additional elements such as manganese, silicon, and copper to enhance its properties. It is used in automotive and aerospace industries.

• Stainless steel c...read more

A thermocouple is a temperature sensor that consists of two different metals joined together at one end, which produces a voltage proportional to the temperature difference between the junction and the other end.

• Consists of two different metals joined together at one end

• Produces a voltage proportional to the temperature difference

• Commonly used in industrial applications for temperature measurement

T-t-t diagram is a time-temperature-transformation diagram used in materials science to understand the transformation of phases in a material.

• T-t-t diagram shows the relationship between time, temperature, and the transformation of phases in a material.

• It helps in predicting the microstructure of a material based on the cooling rate and temperature.

• T-t-t diagrams are commonly used in metallurgy to understand the phase transformations in steel during heat treatment.