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- What is the second law of thermodynamics?
The second law of thermodynamic depicts that the total entropy of an isolated system can never reduce over time.
2. What is ferrite?
Ferrite is a magnetic iron rock.
3. Which pipes are used for steam lines?
Steel pipes with welded fitting are used for steam lines.
4. Distinguish between the shear center and elastic center.6.8M7310 Most Common Interview Questions and Answers ????
The shear center is a center where the force can act with no twist, whereas the elastic center is located at the center of gravity.
5. Name two vital conditions of a perfect gas.
Two vital conditions of perfect gas are:
- It should satisfy the state equation.
- Specific heat remains constant.
6. What is meant by the greenfield project?
These are the projects, which are built from scratch and does not create pollution.
7. What do you mean by cotter joint?
It is one of the types of joint that are used to connect two rods, which are under compressive or tensile stress. This joint is made of steel or iron. Cotter’s joint is used for connecting a piston rod to the crosshead of the reciprocating steam engine.
8. Define pitting.
It is corrosion that turns into a small hole in the metal.
9. What is the alloy of tin and lead?
Solder is an alloy of tin and lead. It is primarily used to make electrical joints.
10. What is the importance of tolerance in engineering?
You cannot design any product without tolerance. It increases the chances of rejection rate and overall product cost. You utilize tolerance in part dimension to reduce cost and facilitate manufacturer.
11. What is caustic embrittlement?
Caustic embrittlement is a physical change in metal. In this phenomenon, the boiler becomes brittle because of the accumulation of caustic soda.
12. Name the boiler that does not need a steam drum.
A supercritical pressure boiler does not need a steam drum.
13. Explain the Otto cycle in brief.
Otto cycle describes the functioning of a typical spark-ignition four-stroke engine. Otto cycle is a description of what happens to gas as it is subjected to changes of volume, temperature, addition, or removal of heat.
14. What do you mean by annealing?
Annealing is the process of heating any material above the recrystallization temperature and cooling after some time. This process increases the hardness and strength of metal material. The result you will get is a reduction of dislocations in the crystal structure of metal being annealed.
15. Explain enthalpy.
It is the heat content of a thermodynamic system.
16. Define a uniformly distributed load.
A uniformly distributed load is a load that is spread over a region of the beam. Here the magnitude of the load remains similar throughout the element.
17. Explain different types of fits.
Fits can be categorized into three groups: 1) clearance fit, 2) interference fit, and 3) transition fit.
- Clearance fit: This fit is identified by the occurrence of clearance between the two similar parts.
- Interference fit: In this fit, the size of the mating parts is predefined to occur interference between these parts. Here the hole tolerance zone is completely below shaft tolerance zone.
- Transition fit: It is a comptonization between clearance and interface fit. In this case of fit, the tolerance zone of the shaft and hole overlaps.
18. Explain important rules that must be kept in mind while designing castings?
Following are the points that you should keep in mind:
- Keep section thickness uniform as much as possible.
- Sudden changes in the thickness should be averted at all costs.
- Design casting by keeping simplicity.
- Avoid large flat surfaces as true large spaces are difficult to create.
- Use a curved shape to improve the stress handling of the cast.
19. What is universal coupling?
Universal coupling is used to connect two shafts whose axes are inclined to each other. It consists of a pair of hinges, connected by a cross shaft.
20. Why would you use pneumatics?
Pneumatic systems are significantly cheaper than other streams, i.e., hydraulic systems. It can move faster and does not leak oil if they develop a leak.
21. Explain mechanical refrigeration.
Mechanical refrigeration is a process by which heat is removed from a specific location using an artificial heat-exchange system. The refrigeration system can be cyclic, non-cyclic, magnetic, or thermoelectric depending on the application for which refrigeration is needed.
22. What are various types of brakes?
Various types of brakes are 1) hydraulic breaks, 2) electric breaks, and 3) mechanical breaks.
23. How will you classify sliding contact?
Sliding contact can be classified based on the various thickness of film bearings.
24. How will you create a piston head?
Piston head can be designed on the basis of the following points:
- The crown must have enough strength to absorb the explosion pressure inside the cylinder.
- You can consider Grashof’s formula to calculate the thickness of the head.
25. Explain knurling.
It is a manufacturing process conducted on the lathe tool to create a pattern on a bar that can be used a handle.
26. What is the importance of a thermostat in the cooling system of an engine?
The thermostat makes sure to keep the engine cool at the optimum level. It prevents decreasing the overall efficiency of the engine.
27. What is the most basic characteristic of supercritical boilers?
Supercritical boilers do not have a heavy drum to separate steam from water and steam. They also require less steel metal.
28. What is the relation between the thickness of the thermal boundary layer and the depth of the hydrodynamic boundary layer?
The ratio of thickness = (Prandtl number)-1/3.
29. What do you understand by engineering drawing?
It is a technical document used to transfer technical details and define requirements.
30. Define the least count
It is the smallest value that can be measured by measuring an instrument. The least count can be measured using the following formula:
Least Count= Value of one scale division – Total number of a Vernier scale division.
Here we are giving Best Mechanical Engineering question and answer for exam and interview
31. What are the different types of screws?
Screws can be classified based on the following parameters:
- the Screw Head
- Screw Thread Type
- Screw Drive Type
32. What is a process flow diagram?
A process flow diagram is a sketch that describes major equipment, plant streams, and key central loops that show the relationship between system components. This diagram contains symbols to identify instruments and vessels it describes the primary flow course.
33. What is GD&T?
GD&T is a sort of abbreviation of Geometric Dimension & Tolerance. It is a system that defines engineering tolerances.
34. Explain bearing
Bearing is a device that is placed between two components of engine for the smoother movement. It enhances the efficiency of any machine.
35. What is the difference between a pipe and a tube?
The significant difference between a pipe and a tube is that a pipe can be measured based on its inner diameter. On the other hand, a tube can be measured based on the outer diameter.
36. Explain the term torque
A force that causes rotation is called torque. It is a measure of how much force is required to rotate an object.
37. What do you mean by emissive power?
It is the amount of radiation emitted per unit.
38. Define coal
Coal is a sedimentary rock that contains other elements like sulfur, oxygen, chiefly hydrogen, and nitrogen. It is the most important primary fossil fuel.
39. Differentiate between total moisture and inherent moisture of coal.
Total moisture in the coil is referred to as the moisture of the bulk as a sample while the air-dried sample is called inherent moisture.
40. What does AFBC stand for?
AFBC stands for Atmospheric Fluidized Bed Combustion.
41. What are the benefits of cycloidal gears?
The primary benefits of the cycloidal gears are:
- It has a wider and high-power flank as compared to Involute gears.
- The contact of Cycloidal gears is between the concave surface and the convex flank. This will reduce the wear and tear of the engine.
- There are no chances of occurring any interference in Cycloidal gears.
42. Briefly explain the term Gravity
Specific Gravity is the proportion of the mass of a substance to the density of a reference substance.
43. Why is cast iron seasoning important before machining?
Cast iron seasoning is important for easy machining and saving the cutting edge of the tool.
44) What do you understand by heat treatment?
It is an operation that involves the heating and cooling process of metals to change its properties.
Here we are giving Best Mechanical Engineering question and answer for exam and interview
45. How can you identify mild steel, cast iron, and high carbon steel?
You can identify these metals by a spark. Mild steel gives medium and dense sparks. Cast iron gives very thick and short flashes. High carbon steel gives long and thick sparks.
46. Define the term latent heat.
It is an amount of heat that changes the property of material without increasing its temperature any further.
47.Why do you need a biological shield in nuclear plants?
The biological shield absorbs neutron, gamma, and beta radiation and protects living things.
48. How to report calorific values of fuel?
You can report them using the following methods:
- As a received or wet basis.
- Dry or moisture-free basis.
- Combustible or ash basis.
49. Explain the nuclear reactor.
A nuclear reactor is a plant that initiates, controls, sustains, and maintains the nuclear fission chain reaction. It protects against radioactive radiation.
50. Define case hardening
Case hardening is a method of making outer surfaces harder of the steel parts. It is done to use low carbon steel.
51. Why is the heat treatment of steel metal crucial?
It is important to get the desired property, change electrical and magnetic properties, and relieve the stress after hot or cold working.
Most important : Here we are giving Best Mechanical Engineering question and answer for exam and interview
Why did you choose to study mechanical engineering?
This mechanical interview question gives the interviewer a chance to learn about the candidate’s interests in mechanical engineering. It helps reveal their passion for the field, and what interests them about engineering in general.
Do they want any job or are they looking to better society through quality engineering design?
Name an engineering skill have you learned recently?
Good engineers are interested in learning new skills, computer programs, and ways to solve problems. Listen carefully to what the interviewee says to see if they have a love of learning new things and are adaptable to various situations.
Tell me about your most successful engineering project
This gives the mechanical engineer the chance to talk about their most successful engineering projects. Explain why they succeeded, what contributions they made to it, any technical skills that are used, and what they learned from the process.
Have you worked on an engineering project that failed?
Some of the greatest learning experiences come from failed projects. At some point when an engineer has worked on many projects, there are times that things don’t work out just right.
An engineer that can admit mistakes and learn from them has the potential to grow into a better engineer.
What mechanical engineering tasks interest you?
The only bad answer is saying “Any task”. Every engineer has engineering tasks they prefer over others, like solving equations, design engineering, building prototypes, testing, engineering analysis, or communicating the design.
This question gives you a chance to see if the main tasks the job calls for are ones the engineer enjoys doing.
Describe your process in checking for flaws
By asking this mechanical engineering interview question you will be able to get a better understanding of the mechanical engineer’s thought processes.
You can also gain insight into their daily workflows and problem-solving skills.
Do you prefer working alone or with an engineering team?
This mechanical engineering interview question can help determine if they work well with teams or are perhaps better suited for solo type projects and work.
Have you ever sent uncompleted engineering work to a client? If so Why?
Companies and employees are often on tight deadlines to get work out the door. This can cause drawings and engineering work to be sent to a client which may be incomplete.
These sloppy methods can frustrate an engineer or manager that has to later clean up the mess.
Talk about your first engineering design
By having mechanical engineering candidates talk about their early design work, hiring managers are able to better understand the engineer’s history in mechanical engineering.
They also gain insight into their thought processes and some of their favorite engineering designs.
What is the top skill a mechanical engineer must have?
This interview question gives the mechanical engineering interviewee a chance to explain what makes a great engineer.
There are a variety of answers you may receive. These answers include strong analytical skills, problem-solving skills, math skills, creative design skills, or strong knowledge of engineering fundamentals.
What is your CAD system of choice? And Why?
Do they prefer SolidWorks, CATIA, Inventor, or other CAD software? There is no wrong answer here and their experience with CAD software will depend on a lot on what industries they have worked in.
Different industries prefer CAD software systems that are more suited to their workflows and design processes.
The interviewer will also get a chance to ask additional questions about the CAD software they have used. This will give the interviewer an opportunity to make sure the candidate has the CAD knowledge necessary for the job.
How would you explain a complex design to a non-technical person?
An engineer that can explain complex ideas and engineering designs in easy-to-understand terms may be a good resource for a variety of reasons.
One of these is meeting with potential clients to win a bid.
They can also help a current client who’s been asking technical questions to understand the project engineering variables better.
Here we are giving Best Mechanical Engineering question and answer for exam and interview