Some Technical Interview Questions with brief answers..

Some Technical Interview Questions with brief answers..

1. Why are Head Gaskets blown?
Normally head gasket blows, when the engine overheats and they can also blow from incorrect installation or poor design. Head gaskets expand and contract according to engine temperature, these cycles may happen after a long period of time, causes the gasket to fail. If you’re replacing the gasket, check the engine block, and head for warping. Follow proper cleaning and torque specifications during assembly.
2. What is the difference between a Fence and a Wall?
A fence is either more temporary or constructed from materials, other than concrete, stone or brick.
3. What is the Difference between a Humidifier and Vaporizer?
The basic difference between humidifiers and vaporizers is that humidifiers disperse cool mist into the air, and vaporizers heat the water to disperse hot steam. Humidifiers are normally used in cooler climates, when due to the usage of heater, the air in the house becomes too dry for comfort and also, it becomes very difficult to breathe. Humidifiers release cool moisture droplets into the air.
Vaporizers also help in moistening the dry air in the house, but vaporizers release hot vapour into the air. There is a heating element in the vaporizers, which help in releasing steam. Vaporizers heat the water and then release vapours.
The basic difference between them is that one emits cold vapours, while the other one emits hot vapours.
4. What is the Difference between a Generator and Inverter?
An inverter is only effective if there is already a source of electrical energy. It cannot generate its own. It can simply convert electrical energy that is already there. On the other hand, a traditional generator cannot make AC current into DC current.
5. What is the Difference between Quantitative and Qualitative Research?
Quantitative research involves gathering data that is absolute, such as numerical data, so that it can be examined in as unbiased a manner as possible.
Qualitative research may yield stories, or pictures, or descriptions of feelings and emotions. The interpretations given by research subjects are given weight in qualitative research, so there is no seeking to limit their bias. At the same time, researchers tend to become more emotionally attached to qualitative research, and so their own bias may also play heavily into the results.
6. Difference between Absorption and Adsorption
• In absorption, one substance (matter or energy) is taken into another substance. But in adsorption only the surface level interactions are taking place.
7. Difference between Liquid and Aqueous
 Liquid is a state of matter, while aqueous is a special type of liquid formed by dissolving a compound in water
• All aqueous solutions are liquids, but not all liquids are aqueous solutions
8. Difference between Gas and Vapour
· Vapour can turn back and forth into liquid and solid states but a gas cannot
· Gases cannot be see while vapours are visible
· Vapours settle down on ground while gases do not
9. Difference between Boiling Point and Melting Point
– The melting point is a defined for solids when it transfers from solid state to liquid state.
– The boiling point is defined for liquids for a state change from liquid to gas.
– Boiling point is highly dependent on the external pressure whereas the melting point is independent of the external pressure.
10. Why is sound faster in warm air?
The speed of sound in air cair = 331.3 + (0.66 x T) m/s, where T is the temperature in °C.
The speed of sound is proportional to gas temperature and inversely proportional to its molar mass.
Sound is transferred by collisions of molecules. Therefore sound waves will travel faster on warm air because collisions of molecules of air in warm air is greater.


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Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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