Interview Questions.

Mechanical Engineering Interview Questions and Answers


Mechanical Engineering Interview Questions and Answers

Q1. What Kind Of Pipes Are Used For Steam Lines?

Ans: Pressure and temperature are two of the maximum vital factors to be considered earlier than choosing the kind of material for use. Steam is a compressible gasoline due to which the potential of the pipe line relies upon on the size of the pipes and pressure of the steam. Since steam at even low pressure may be risky, greater care is to be taken. Galvanized pipes are typically not used for steam. Pipes made from slight metallic with welded fittings are as an alternative in large part used.

Q2. What is the difference between shear center flexural center of twist and elastic middle?

Ans: The shear center is the centroid of a cross-segment. The flexural center is the middle of twist, which is the point on a beam that you can add a load with out torsion. The elastic center is placed at the center of gravity. If the item is homogeneous and symmetrical in both guidelines of the pass-phase then they're all equivalent.

Q3. What is the distinction among Production and Manufacturing?



Meaning    The procedure of manufacturing products by way of the use of resources like exertions, machines, gear, uncooked materials, chemicals and others is called a Manufacturing.    Production is a process of creating some thing used for consumption by combining numerous sources.

Concept    A system in which raw fabric is used to generate output.    A method of changing inputs into outputs.

Compulsory resources    Men and Machine    Men

Form of input    Tangible    Tangible and Intangible

Form of Output    Goods best    Goods and Services

Creation of    Goods that are appropriate to be used    Utility

Q4. What is the distinction among scavenging and supercharging?


Scavenging is system of flushing out burnst gases from engine cylinder by way of introducing sparkling air in the cylinder before exhaust stroke ends.

Supercharging is the technique of imparting higher mass of air through compressing the atmospheric air.

Q5. Why entropy exchange for a reversible adiabtic technique is zero?

Ans: Because there may be no warmth transfer on this procedure.

Q6. What are two vital conditions of ideal fuel ?

Ans: It satisfies equation of state and its unique heats are consistent

Q7. What is an accident?

Ans: An coincidence is an surprising and unforeseen event which may additionally or might not harm to someone or a machine device.

Q8.  What are the usual sizes of drawing board as in line with Indian Standards?

Ans: As consistent with Indian Standards: 1250×900,900×650,650×500,500×350,350×250 sizes are available.

Q9.  What are the functions of a scale?


To measure distance accurately.

For creating a drawing to scale either in complete length, reduced length or enlarged length.


Q10.What is a sketching?


Ans: This is the freehand expression of the image language.

Q11.  What do you imply by using First Aid?

Ans: First Aid is immediately and transient care given to someone who affected unintended harm or a surprising infection before the appearance of the health practitioner.

Q12. What is the difference between stalling in rotary compressions?

Ans: Stalling is alocal phenomenon and it takes place while how breajs faraway from the blades.

Surging reasons whole breakdown of flow and as such it affects the whole machine.

Q13. What is pitting ?How it's miles precipitated?

Ans: Non uniform corrosion over the whole metallic floor ,however occuring simplest in small pits is referred to as pitting .It's far resulting from loss of uniformity in steel.

Q14. What is caustic embrittlement?

Ans: It is the actual bodily change in steel that makes it extraordinarily brittle and filled with minute cracks .It happens particularly within the seams of rivetted joints and across the rivet holes.

Q15. What is Drafting system (Mini Drafter)?

Ans: A drafting device is a tool used in technical drawing, consisting of a couple of scales established to form a right perspective on an articulated protractor head that lets in an angular rotation.

Q16. What are the blessings of tools drive?

Ans: Here are the blessings of equipment drive:-

It presents massive range of pace and torque for equal enter energy.

It is compact and need much less space.

It gives greater correct timing than a chain system does, less friction loss and less noisy.

It gives specific velocity ratio.

It is used to get numerous speeds at special load situations.

There are one-of-a-kind geometry of gears which gives exclusive advantages for various programs.

In preferred it's miles useful for electricity transmission among  shafts.

Q17. What is ductile-brittle transition temperature?

Ans: The ductile brittle transition temperature is the minimum temperature in which a given cloth has the capacity to soak up a particular quantity of strength with out fracturing.

As temperatures decrease, a material’s potential to deform in a ductile remember decreases. This is usually measured the usage of on a case-by using-case basis the usage of a Charpy effect take a look at.

Q18. What is the distinction between rocket motion and a projectile motion?

Ans: The key difference is among the release phase.

In a projectile motion once force is applied in opposition to gravity (or no longer) you dont apply additional pressure be it regular or various to resist the movement or accelerate it similarly with some outside source.

In rocket movement at some point of the initial release level a non-stop force is carried out to do paintings against gravity.

Q19. Define Carnot engine.

Ans: It become an imaginary engine conceptualized by way of Carnot and this follows the Carnot cycle and provides a hundred% efficiency.

Q20. Differentiate P11 and P12 Pipes.

Ans: P11 the chromium molybdenum composition which has 1% of chromium and molybdenum by means of 1/4% .

Whereas P12 is the chromium molybdenum composition which has 1% of chromium and a pair of% of molybdenum.

Q21. What are the methods of extinguishing the hearth ?


Separating or getting rid of the burning cloth from the neighborhood of the fireplace.

Preventing the air float to the hearth.

Lowering the warmth created by way of burning substances.

Q22. What are the precautions to be taken to keep away from fire?


The buckets at the side of sand need to be positioned within the workshop.

Switches and different electric components have to be product of fireproof material.

Carbon dioxide gasoline must be positioned at required factors in special containers.

Fire extinguishers of appropriate type should be positioned at available places.

Q23. What protection precautions need to be determined even as running in the workshop?


Keep keep ground smooth, loose from oil and other slippery materials.

Wear a proper dress and avoid loose clothing and free hair.

Wear footwear and avoid chapels.

Avoid gambling, loose talk and funning inner the shop floor.

Keep good house responsibilities and positioned all unnecessary objects and rejected items in the scrap field.

Learn everything approximately the machine before beginning and clear all the doubts.

Keep a secure distance from rotating and sliding elements.

Never keep inflammable substances inside or around the shop.

Never play with energy, fire, elements with sharp aspect and so on.

Keep fireplace buckets and extinguishers ready for use.

Q24. Why gas turbine poer plant needs efficient compressor ?

Ans: Because a large part of turbine work is eaten away through compressor and its inefficiency will have an effect on internet power output and value of generation.

Q25. What is the effect of inter cooling in gasoline turbines ?

Ans: It decreases thermal performance however increases net output