# Mechanical Engineering interview questions answers

In this post, we will discuss Mechanical Engineering interview questions answers. These questions and answers will help in your interviews.

#### Mechanical Engineering interview questions answers

Question1. What is the difference between heat transfer and mass transfer?

Answer: Heat transfers are due to temp differences (high temperature to low temperature).

There are three types of heat transfers-

Conduction

Convection

Whereas mass transfers are due to concentration differences (for example suppose that some portion of the room have a high concentration of a gas and the other portion have a low concentration. here the gas slowly diffuses from a high concentration area to low concentration area to attain equilibrium).

Question2. Define Critical Pressure ratio?

Answer: Critical pressure ratio is the pressure ratio where the flow is accelerated to a velocity equal to the local velocity of sound in the fluid. Critical pressure is used to determine the maximum gas flow through a nozzle.

Question3. What are the two essential conditions of perfect gas?

Answer: It satisfies the equation of state and its specific heats are constant.

Question4. Define Dropwise Condensation.

Answer: Dropwise condensation is a process occurs when a vapor condenses on a surface not wetted by the condensate. The liquid collects in the form of countless droplets of varying diameters on the condensing surface, instead of forming a continuous film, and does not wet the solid cooling surface.

Question5. Why the rate of condensation is higher on a polished surface compared to rusty surface?

Answer: Rate of Condensation is higher on a polished surface due to Dropwise Condensation. Polished surface promotes Dropwise Condensation and does not wet the surface.

Question6. How much is work done in an isochoric process?

Answer: An isochoric process, is a thermodynamic process during which the volume of the closed system remains constant. An isochoric process is also called a constant-volume process.

ΔV = 0

Work done in an isochoric process is zero.

Since ΔW= PΔV.

Question7. When maximum discharge is obtained in a nozzle?

Answer: Maximum discharge is obtained in a nozzle at a critical pressure ratio.

Question8. What is the relation between KN (kilonewtons)  and KG (kilograms)?

Answer: 1 KN = 101.97 kgf.

Question9. What is the difference between SPC & SQC?

SPC is the process of controlling the defects in the product using various methods.

SQC- statistical quality control

SQC is the process of maintaining the quality.

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