February 9, 2014

MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS

1.) What do you understand by acoustic velocity ?

Ans: Accoustic velocity is the speed of a small pressure (sound) wave in a fluid.

2.)Explain difference between cohesion, adhesion and capillarity ?

Ans: Cohesion is the attraction of like molecules.
Adhesion is the attraction of unlike molecules for each other.
Capillarity is the elevation or depression of a liquid surface in contact with a solid.

3.)What is bulk modulus of elasticity ?

Ans: It represents the compressibility of a fluid. It is the ratio of the change in unit pressure to the corresponding volume change per unit of volume.

4.)What is is entropic exponent ?
Ans: It is the ratio of the specific heat of a gas at constant pressure to the specific heat at constant volume.

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