JOB INTERVIEW QUESTIONS

MECHANICAL ENGINEERING JOB INTERVIEW QUESTIONS:-

1. What is Difference between Hardness and Toughness?

Ans. Toughness is the ability of a material to absorb energy.
Hardness is the ability of a material to withstand wear.

2.What does F.O.F Stand for Piping Design?

Ans.Face of Flange, The F.O.F (Raised face and Flat face) is used to know the accurate dimension of the flange in order to avoid the minute errors in measurement in case of vertical or horizontal pipe lines.

3.Difference between Performance and Efficiency?

Ans.The accomplishment of a given task measured against preset known standards of accuracy, completeness, cost, and speed is called as Performance.

Efficiency is defined as the input given and the work obtained from that input like money, time, labour etc. It’s the main factor of productivity.

1. What is knurling?

: Knurling is a machining process normally carried our on a centre lathe. The act of Knurling creates a raised criss-cross pattern on a smooth round bar that could be used as a handle or something that requires extra grip.

2. What is the mechanical advantage of a double pulley?

: It only takes half the effort to move an object but twice the distance.

3. What is extrued aluminum?

: Extrusion is the process where a metal or a metal bar is pulled through a mandrel to elongate it and/or give it a final shape.
Extruded Aluminum is a common form of making small aluminum wire, bars or beams and many varieties of small non-structural, decorative pieces.

4. What is a Newtonian fluid?

: A Newtonian fluid possesses a linear stress strain relationship curve and it passes through the origin. The fluid properties of a Newtonian fluid do not change when any force acts upon it.

1)What is Sentinel Relief Valve?
Ans. It’s a special type valve system. The valve will open when exhaust casing pressure is excessive (high). The valve warns the operator only; it is not intended to relieve the casing pressure.

2)What is the difference between Specification,Codes, Standards?
Ans. Specification is describing properties of any type of materials. Code is procedure of acceptance and rejection criteria.
Standard is accepted values and compare
other with it.

3.) What is difference between Welding and Brazing?

Ans. In Welding concentrated heat (high temperature) is applied at the joint of metal and fuse together. In Brazing involves significantly lower temperatures and does not entail the melting of base metals. Instead, a filler metal is melted and forced to flow into the joint through capillary action.

1.)What are two essential conditions of perfect gas ?

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

2.). Enthalpy and entropy are functions of one single parameter. Which is that ?

Ans: Temperature.

3.)What is caustic embrittlement ?

Ans: It is the actual physical change in metal that makes it extremely brittle and filled with minute cracks. It occurs particularly in the seams of rivetted joints and around the rivet holes.

4.)Why large boilers are water tube type ?

Ans: Water tube boilers raise steam fast because of large heat transfer area and positive water circulation. Thus they respond faster to fluctuations in demand. Further single tube failure does not lead to catastrophy.

VERY IMPORTANT QUESTION:-

Q:-Difference between internal combustion engines and external combustion engines?

Answer:- In an *Internal Combustion Engine*, the Fuel is burnt in the cylinder or vessel eg. Diesel or Petrol engine used in Cars.
In an *External Combustion Engine*, the internal working fuel is not burnt. Here the fluid is being heated from an external source. The fuel is heated and expanded through the internal mechanism of the engine resulting in work. eg. Steam Turbine, Steam engine Trains.
* Internal engine has its energy ignited in the cylinder. like 99.9% of engines today.
* An external combustion example is a steam engine where the heating process is done in an boiler out side the engine.

So in fact we can define internal combustion engine develops its operating pressure by burning fuel directly in the engine. Gasoline engines, Wankel engines, diesels, gas turbines are all internal combustion. External combustion engines burn the fuel outside the engine and use it to heat an operating fluid which then is used to operate the engine. Steam locomotives, steam turbines, and Stirling engines are external combustion

Why can't we use petrol in diesel engine?

Petrol has a lower ignition temperature and is more inflammable than diesel.The compression ratio in diesel engine is very much higher than petrol engine, so if petrol is used in diesel engine there will be lot of knocking( the phat phat sound like that of Enfield)
and chances are the engine ll be greatly damaged and there is a chance of fire hazard resulting in personal injury.

Its just like eating grass instead of rice.
Of course you can eat but, at once you won't feel anything and day by day you will face problems related to stomach, digestion, etc.
Like this, if you use petrol instead of diesel, the vehicle will work but it will stuck and trouble at the middle.

Q. Why I-section beam is preferred for heavy loading?

Ans.Cross sectional shape I, giving many benefits. It is very good for giving stiffness (less deformation on loading) and to withstand higher bending moments (as a result of heavy loading) on comparison with other cross-sectional shapes of same area. Also, it is very easy to manufacture. It will have more moment of inertia.


What is the difference between pump and compressor ?
When we use pump and When we use compressor?

Ans:-Basically a Pump is used for liquid or fluid to transform it to a much high pressure head while a Compressor is used for gases to transform from low to a much high pressure.
From Mechanical Engineering point of view liquid is incompressible so Compressor cannot be used for liquid substances. 


Q. WHY HAVE EIGHT CYLINDERS IN AN ENGINE? WHY NOT HAVE ONE BIG CYLINDER OF THE SAME DISPLACEMENT OF EIGHT CYLINDERS INSTEAD?

A. There are a couple of reasons why a big 4.0-liter engine has eight half-liter cylinders rather than one big 4-liter cylinder. The main reason is smoothness. A V-8 engine is much smoother because it has eight evenly spaced explosions instead of one big explosion. Another reason is starting torque. When you start a V-8 engine, you are only driving two cylinders (1 liter) through their compression strokes, but with one big cylinder you would have to compress 4 liters instead

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FAQ'S BY HR'S

FAQ'S BY HR'S •Tell something about yourself? •Why do you want to leave your current job? •Why do you want to join in industry? •How do you organize your priorities? •Speak about yourself professionally? •Elaborate on your strengths with examples? •What are the competitive challenges in Human Resource Management? Explain managing changes in HRM? Explain •Where do you see yourself after 10 years from now? •Suppose you already have job offer and giving  interview to other new company, What reasoning should you give for that? •Why do you like to join this company? What would you do for the growth of this company? •What are your short and long term goals? Tell me with some example •Why do you think you would do well at this job? •What is more important to you: the money or the work? •What would your previous supervisor say your strongest point is? •Tell me about a problem you had with a supervisor? •What has disappointed you about a job? •Tell me about your ability to work under pressure? •Do your skills match this job or another job more closely? •What motivates you to do your best on the job? •Are you willing to work overtime? Nights? Weekends? •Would you be willing to relocate if required? •Are you willing to put the interests of the organization ahead of your own? •Describe your management style? •What have you learned from mistakes on the job? •If you were hiring a person for this job, what would you look for? •Do you think you are overqualified for this position? •How do you propose to compensate for your lack of experience? •What qualities do you look for in a boss? •Tell me about a time when you helped resolve a dispute between others? •What position do you prefer on a team working on a project? •Describe your work ethic? •What has been your biggest professional disappointment? •Tell me about the most fun you have had on the job? •Do you have any questions for me? •Do you consider yourself successful? •What do co-workers say about you? •Do you know anyone who works for us? •What kind of salary do you need? •Are you a team player? •How long would you expect to work for us if hired? •Have you ever had to fire anyone? How did you feel about that? •What is your philosophy towards work? •If you had enough money to retire right now, would you? •Have you ever been asked to leave a position? •Explain how you would be an asset to this organization? •What irritates you about co-workers? •What kind of person would you refuse to work with?

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Interview

 GROUP DISCUSSION

 DYNAMICS OF GROUP DISCUSSION

  

 In order to put up a decent performance in a Group Discussion, knowledge about the personality traits that the job fields look for is desirable. So let us get into this right now.

1. Teamwork and Team Player: Teamwork is the ability to work together towards a common vision, is the ability to direct individual accomplishments towards organizational objectives. It is the fuel that allows common people to attain uncommon results.

 2. Logic and Clarity of Thought:Your Logic plays an important role while expressing your opinions ideas in a Group Discussion.

3. Leadership:"The pessimist complains about the wind, the optimist expects the wind to change but a leader adjusts his sails". A Group Discussion where participants get emotionally charged and the Group Discussion gets chaotic.

Here a leader is the one who acts correctly and makes the Discussion where participants discuss the topic assertively by touching on all its nuances and try to reach the objective.

• A leader, no matter how hard-fought the issue, never gets personal. He never says or executes anything that may come back to haunt him on another issue
• A leader does his homework. He is very well aware of the fact that he can't lead without knowing what he is talking about
• A leader uses his abilities and power to persuade, not to intimidate

4. Assertiveness:Enjoying your rights, expressing your feelings, asking for what you want, stating your views - with integrity, honesty, directness, respect for others is the definition that is relevant to you and your circumstances in the Group Discussion.
An assertive person will be able to handle the following situations in a Group Discussion.

• an aggressive person doesn't listen to your views/needs, so you need to make them listen
• an unassertive person doesn't express his views, so you need to encourage them to express their views

·         a passive-aggressive person avoids any real dialogue, so you need to engage them in the discussion.

5. Think outside the Box: Thinking outside the box means to think creatively, unimpeded by orthodox or conventional constraints. Thinking outside the box requires different attributes that include:

• Willingness to take new perspectives.
• Openness to do different things and to do things differently.
• Focusing on the value of finding new ideas and acting on them.
• Striving to create value in new ways.
• Listening to others.

6. Flexibility: "Who says golf can't be played with Apples?"..If this is your attitude then you are the one for the game. Absence of this quality makes you a friend to no person in the Group Discussion. Besides emphasizing on your idea you must be open to all the other possible ideas as well. In brief you should consider all the possible dimensions of the issue. Never ever start your Group Discussion with a stance or a conclusion.

7. Initiative: Bear in mind that you have to initiate a group discussion only if you are well versed with the topic of the Group Discussion. There's no point in fumbling or giving up on your initialized idea as quickly as someone makes a statement contradicting your opinion. If you initialize a Group Discussion and fails to survive on your idea at regular intervals, then you are in serious trouble. As the saying goes, "CONTENT IS KING", you must be proficient in the topic of the Group Discussion.

Remember, that the act of "Initiation" creates the first impression of your abilities.

8. Persuasiveness: You should act like a shepherd who always tries to persuade the sheep that their interests and his own are the same. You must possess the ability to analyze and persuade others to see the problem not only from your point of view but also should be able to persuade them to analyze it from multiple perspectives, of course without contradicting straight away their ideas and opinions.

9. Communication Ability: This is the key skill in order to exhibit all the qualities that we discussed till now. Communication skills doesn't mean public speaking, which according to me is an art of diluting two-minute idea with two-hour vocabulary.

10. Conceptualization: Conceptualization is the use of particulars that has come into the discussion to bring to light within the mind a generalizable idea. The act of conceptualization is the act of thinking quickly about the ideas exchanged and seeing beyond existing ideas and applying them to summarize the group discussion.

At the end of the discussion, you could probably summarize in a few sentences that presents the overall perspective. You may not be able to do it in every group discussion, but you must have the ability to do this when the situation demands.

 Intervention

                        When the Group Discussion goes on each participant with 

his/her subject knowledge tries to speak in order to express the opinion. Since every participant is ready to play his/her role, with good subject knowledge of that particular topic and intensive listening skills, he/she can start the point meddling/ throwing the opinion in the middle of the discussion in order to track the discussion. But the person who wants to intervene must be confident with more and patience. When each participant intervenes there will exist the following roles namely,

            Shaper, Initiator, coordinator, Motivator, Felicitator, Informer, Illustrator, Passive Participant, Talking terror and so on.

 

Summarizing

             

Summarize the discussion is an important as initiating it. It is unlikely that one will get the chance of doing the both. So, if you could not initiate the discussion, make sure that you summarize it. In the summary make use of your notes and acknowledge other’s opinions before coming to the conclusion. A would hardly get enough time to summarize, do not venture upon making it an elaborative one. Keep it short and simple.

  Modulation of voice

          

  It is essential to refine the quality of one’s voice and learn to adjust or vary its tone or pitch (that is, voice modulation). As voice modulation gives variety to oral delivery, it can improve expression during oral presentations, speeches, debates, conferences, group discussions and meetings. An impressive voice may be a God given gift but voice quality can be improved by proper voice training and regular practice.

            We should first analyse the quality of our own voice. Then, we should identify the weak points of our voice, ( for example, it is too low, or too harsh). These weakness can be improved upon with the help of friends, classmates, teachers, and by cultivating sensitivity to sounds and voices, getting proper ear-training, practicing voice modulation according to meaning and intention of the message and learning to vocalize one’s feelings.   

 Body language

More than your words, your gesture will show your confidence. Do not speak only with your mouth but make use of your hands also. Remain active throughout the discussion. If not accomplished by proper body language, your words may not produce the required weight. Keeping a positive attitude will give you an upper hand over other participants.  

 Relevance

            GD is a relevantly exercise where opinions and views of each member of the group are important for developing consensus and reaching to a conclusion. So, you have to ask for opinions, give opinions, balance points of view, or express agreements and disagreements which are relevant to the topic.

1.      Asking for Opinions: You may ask one person to give his or her opinion on any point or your request might be direct at a group of people in general.

2.      Giving Opinions: During GD you may have to give your opinions about the subject being discussed.

3.      Supporting Your Opinions: In order to make your views acceptable to the other group members, you need to support them with facts, examples, illustrations, or arguments.

4.      Balancing Points of View: In order to be reasonable and rational, GD participants may have to balance points of view by trying to look at both sides of a given opinion.

5.      Agreeing and Disagreeing: Agreeing and disagreeing are the two aspects of interaction in a GD.

 Fluency and Coherence

            Fluency is the most important characteristic of the effective speech. Let us try to understand this term and the skills needed in order to achieve fluency in GD. Fluency is the natural flow of words without any unnecessary pauses and repetition. This natural flow of words or smoothness of expression can come from the ability to compose and speak meaningful utterances by using appropriate vocabulary and grammar skills. Fluent and expressive speech normally depends on the range of vocabulary appropriately used, as poor vocabulary will cause lack of fluency. Fluency also depends on the appropriate use of macro- skills of grammar and pronunciation such as subject –verb agreement, tense formation, clause linkage, use of transitional words, basic intonation patterns, rhythm, and so an. Moreover, one should be confident of the content of one’s speech in order to be fluent. In order to improve self expression and achieve the desired clarity and fluency, articulation, pronunciation, voice quality, accent, and intonation need to be improved.

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