Question Set 171

1) What is the second law of thermodynamics?

The second law of thermodynamic depicts that the total entropy of an isolated system can never reduce over time.

2) What is ferrite?

Ferrite is a magnetic iron rock.

3) Which pipes are used for steam lines?

Steel pipes with welded fitting are used for steam lines.

4) Distinguish between the shear center and elastic center.

The shear center is a center where the force can act with no twist, whereas elastic center is located at the center of gravity.

5) Name two vital conditions of a perfect gas.

Two vital conditions of perfect gas are:

·          It should satisfy the state equation.

·          Specific heat remains constant.

6) What is mean by greenfield project?

These are the projects, which are built from scratch and does not create pollution.

7) What do you mean by cotter joint?

It is one of the types of a joint that are used to connect two rods, which are under compressive or tensile stress. This joint is made of steel or iron. Cotter joint is used for connecting a piston rod to the crosshead of the reciprocating steam engine.

8) Define pitting.

It is corrosion that turns to a small hole in the metal.

9) What is the alloy of tin and lead?

Solder is an alloy of tin and lead. It is primarily used to make electrical joints.

10) What is the importance of tolerance in engineering?

You cannot design any product without tolerance. It increases the chances of rejection rate and overall product cost. You utilize tolerance in part dimension to reduce cost and facilitate manufacturer.