Interview questions for a mechanical engineer

Here are some of the questions that you can find in an interview for a job as a mechanical engineer (mecanical engineer). Apart from the common questions of any interview, strengths and weaknesses, tell me why you want to work here, and others will make you more technical and detailed questions related to your profession. Please note that questions vary, depending on the specific field for you to interview the company for you to interview, and other factors. This list is simply to help you have a base of questions, so you have a better idea of ​​what you’ll find on the day of the interview.

Most of the questions that will make you be techniques, how to solve a problem using a particular technique and also to discover the logic that you apply. Therefore, prepare yourself not only to answer questions, but to demonstrate your technical skills. Here are some of the questions that you can find on your job interview

What is the difference between scavenging and supercharging;? Scavenging is the washing process flue gas engine cylinder by introducing fresh air into the cylinder before the end of the exhaust stroke. Overfeeding (supercharging) is the process of providing greater air mass by compression of atmospheric air. What is the Rankine degree?

Answer: Scale defined measuring temperature in degrees Fahrenheit above absolute zero.

Why the entropy change for a reversible adiabatic process is zero; Answer: Because there is no transfer of heat in this process; What are two essential conditions of ideal gases; Answer:.? Satisfy the equation of state . and the temperature is absolute; the enthalpy and entropy are functions which parameter; Answer:. temperature.

What is the relationship between the COP (coefficient of performance) heating and cooling; Answer: The coefficient of heating is more than the coefficient of cooling unit; How is carried out the work in the isochoric process. ; Zero pressure-volume work.

What is a reciprocating compressor? (Reciprocating compressor) is a type of compressor that manages to compress the volume of a gas in a cylinder.

What is the exergy? (Exergy)

Is the portion of energy that can be converted into mechanical work.

What it is called pitting and how it occurs?

Answer: Pitting is nonuniform corrosion occurring in some metals, mainly because of their lack of uniformity.

What impurities form deposits and impurities soft scale; Answer:. Sulfates and chlorides of lime and magnesium flakes hard, and carbonates of lime and magnesium soft flakes; What is the difference between hard water and water ? soft; Answer:. hard water contains excessive impurities forming scale and soft water contains substances formed by almost nothing of scale; What two elements in the water supply can cause corrosion of pipes and boiler plates ?; a: the acid and oxygen in the feedwater corrosion mine.

What should be done to prevent a safety valve to keep his seat; Answer:. The safety valve must be started periodically for corrosion may take place on the valve and valve seat; Why large boilers are type water tube; Answer: water tube boilers raise steam fast due to the large area of ​​heat transfer and circulation positive water. Therefore they respond more quickly to fluctuations in demand. In addition to the tube single failure does not lead to catastrophe What type of boiler does not need a vapor deposition; Answer:.?. Boiler supercritical pressure; Why the tops of some wells are usually elliptical; Answer: form elliptical aperture has minimal surface and thus weakens the plate slightest. In addition, it is very convenient to put and remove the cover plate elliptical opening.

Why the boiler is purged each time before you start cooking fuel; Answer: Purging ensures that any unburned fuel in the oven, otherwise it can lead to an explosion is eliminated.

Sources: Mechanical Engineering Forum

Association rebuilders and automotive rectifiers


Department of Applied Physics of the University of Seville

Rankine scale