Interview Technical Questions

Here are 100+ Technical Questions from Mechanical Engineering for Placements or PSUs interviews.

1. Why we do not use the same technology to start both SI/CI engine?

2. Which one is more efficient? A four-stroke engine or a two-stroke and why?
Ans: The Four-Stroke engine is more efficient primarily Because of the presence of valves which precisely control the flow of charge into the chamber and exit the exhaust gases with proper timing which is hard to achieve by ports in a 2 stroke engine.

4. Why there is no differential in a train. What happens when a train takes a turn?

5. A cantilever beam is loaded at a point on its ends what will be the effect in shear force?

6. Why vehicle does not move when its gear is applied though parked in the slope area?

7. What is the shear force in fluid-particle?

8. How gear ratio helps in power variation?

9. What is the angle of twist in drilling?

10. What is the difference between the impact force and sudden force?

11. How to calculate turbine efficiency?

12. Why centrifugal pump casing is called involutes casing?

13. What will happen if a reciprocating compressor runs the exactly in opposite direction?

14. What is the effect of clearance volume in the performance of air- compressor?

15. What are the advantages and disadvantages of the critical speed of the turbine?

16. What will happen if the oil is mixed with boiler feed water?

17. What is the difference between fans and blowers?

18. What are the protections required to protect the turbine?

19. what is the critical temperature?

20. Air is a bad conductor of heat. Why it becomes hot in summer?

21. How many stages are there in the compressor and in gas turbines?

22. Which is more efficient? A rear-engine Volvo Bus or a Front-engine Volvo Bus? (Engine Capacity is the same for both) why?

23. What is the difference between stress and pressure?

24. What is Boiler HP?

25. What is Auto Dosing?

26. What happens when too much oil is injected in the working cylinder?

27. How many manholes should be there on the boiler? Why?

28. What is used to check the amount & quality of fuel in two-stroke IC engine?

29. Work done in the throttling process is given by which formula?

30. The function of the strainer in the IC engine is?

31. What is the difference between the air pre-heater & air blower?

32. Why the compression ratio of the diesel engine should be high?

33. A vertical plate and a horizontal plate are suspended in an open room. Both are heated to the same temperature. Which one will cool first? Why?

34. What is the color of flame if the boiler is running?

35. Which is the best lubricant-air, oil or water?

36. Tell the octane number in Indian petrol?

37. Difference between enthalpy & entropy?

38. What is the difference between a safety valve and a relief valve?

39. Explain cooling and its types?

40. What is the working principle of air compressor?

41. What is cryogenics and what are its fundamentals?

42. What is the difference between a shaper machine and a planner machine?

43. Why stress relieving of stainless steel is not proffered?

44. What are the advantages of PID controllers compared with those of a PLC?

45. Which two continents are mirror images of each other?

46. Where half nut is used?

47. What is the need for drafting?

48. A turbocharger is driven by.............? and what its speed

49. Why turbocharger used in DG....?

50. The stage below saturation is called?

51. Why is a condenser used in a Rankin cycle?

52. What is a servo motor?

53. Can we use light-duty vehicle axles into the heavy-duty machinery axle? If no then why?

54. Stress-strain diagram for fluid?

55. Where manning formula used?

56. What is the level of documentation for an ISO 9001 certified company?

57. What is backplate in centrifugal pumps and its purpose?

58. Why tires are manufactured in black color?

59. Whether ductile material can fail in a brittle manner? When?

60. On what property can you distinguish material as brittle or ductile?

61. Name fuels used in nuclear power plants?

62. On what thermodynamic cycle nuclear power plant works?

63. How can you increase the efficiency of powerplant without changing in the effort?

64. What is the purpose of the governor in a Diesel engine?

65. Why petrol engines have more power than diesel engines of the same capacity?

66. What is the difference between Torque and Power (layman Idea)?

67. What will be the induced stress in the bar?

68. What is the Difference between Rated Speed and Economic Speed?

69. How to convert from HP to BHP or CC to Bhp please explain?

70. How material no. 2062 will mild steel of density 7.85? What are the other codes?

71. Why petrol engine gives more power than the diesel engine even though the diesel engine has a high compression ratio?

72. What is mean by Resistance welding?

73. Compare Brayton and Otto cycle.

74. Why we have to know the specific frequency of any equipment? does anybody know about specific frequency?

75. What is pulverization?

76. What is the function of an isolator?

77. Why the back wheel of the tractor is bigger than the front wheel?

78. Flow will increase or decrease or remain same?

79. Why Mechanical seal used in Pumps?

80. The ratio of Emissive to absorption power of heat by a body is equal to heat emitted by a perfect black body. Who said the statement?

81. What is colour of flame if the of Halide Torch detects a refrigerant leakage?

82. How can we remove paint from (painted over)plastic or nylon objects without damaging the object?

83. How to calculate or arrive the capacity of a mechanical press?

84. The property of a metal that is determined by the indentation on a metal surface

85. The amount of thickness of the metal sheet that can be welded by ultrasonic welding is?

86. The amount of carbon present in Cast Iron?

87. Numeric control is used for?

88. The amount of moisture that is to be present in wood to be called dry wood is?

89. The pattern material used in Investment casting Process is?

90. What is the use of offset follower in cam? Why and where we have to use this type of follower?

91. What is the use of offset follower in cam? Why and where we have to use this type of follower?

92. State the difference between Forging & Fabrication?

93. What is flange rating?

94. What amount of heat energy loss in ESP?

95. What happen when diesel is injected in petrol engine?

96. What do you mean by property of system?

97. Why joule-Brayton cycle is not suitable for a reciprocating engine?

98. How does “turbulence” differ from swirl?

99. Is octane number beyond 100 is possible?

100. Explain the effect of fuel structure on knocking.

101. Discuss the advantages and disadvantages of LPG as a fuel in S.I. Engine?

102. What is the impact of using throttling device instead of expander in vapour compression cycle?

103. What is moisture choking? Which refrigerants are more prone to it?

104. What is Montreal protocol and why CFCs are being phased out?

105. Why reverse Joule Brayton is used in aircraft refrigeration system?

106. Explain how solar-energy can used in refrigeration system?

107. Is wet bulb temperature a thermodynamic property?

108. What is the utility of comfort chart?

109. How would you decide whether a reciprocating compressor or centrifugal compression is to be used in a refrigerating system?

110. Why smoking is not allowed in the air-conditioned enclosure?

111. Why desert coolers become ineffective in raining season?

112. Why package units are being preferred over central air conditioning system?

113. What is MAPI.

114. What is capital budgetary?

115. What is group technology layout?

116. What is leveling & smoothing in production technology?

117. What is the difference between method study & work measurement?

118. How oil is produced? What is the size of well?

119. Pumps used in drilling procedure and why? Why not centrifugal pump? What if we want high head and high discharge?

120. Use of CNG, LNG, LPG etc.

121. What is FPPPA charge?

122. What is Whilling Charge? 

123. What is preventive maintenances?

Additional Technical Questions

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Technical Questions For Interview Mechanical Subject wise

Type of technical questions asked will be from basics. Most of the time your favorite subjects will be asked and they start from there.

Strength of Materials

• What do you mean by uniform strength in a beam?

• What is the difference between pure shear and simple (normal) shear?

• Is it possible that a decrease in the area gives a decrease in stress?

• Whether shear stresses are always parallel to shear forces?

• By which experiment, you find the toughness of a material.

• Distinguish between direct stress & bending stress.

• What do you mean by Torsional rigidity & lateral rigidity?

• Define “slenderness ratio”. How it is used in a long and short column?

Theory of Machines

• What is Keneddy theorem?

• What is the defect in Davis steering gear?

• Do we need a screw with an efficiency less than 50%?

• What is a backlash?

• What is the damping ratio?

• If $\frac{\omega}{\omega _n} > \sqrt{2}$ whether it will be advisable to provide dampers?

• Define Resonance.

• Define critical speed or whirling speed or whipping speed.

• What is a machine? Giving example, Differentiate between a machine & structure.

• What is the mechanical advantage?

Machine Design

• What are rolling contact bearings?

• What are the antifriction bearings?

• What is the stress coThermodynamicsncentration factor?

• What is the bolt of uniform strength?

• What is the difference in Static Load carrying capacity & Dynamic Load carrying capacity?

• Why we are not using the unit joule for torque instead of N-m.

• What is Low cycle fatigue failure and High cycle fatigue failure? What are the considerations of these while designing a machine?

• What is the mechanical advantage?

• How trains take turns though there is no differential gear?

• Do you know the epicyclical gearbox? What is the practical application of the epicyclical gearbox?

• What is the tooth profile? Which one is better?

Thermodynamics

• What is the availability function for a closed system?

• If it is possible that entropy of a system can decrease during a given process?

• What is a dead state in thermodynamics?

• What is exergy?

• What happens to the triple point line when projected to the P-T plane?

• What is the compressibility factor and what is its value for Vander walls gases.

• What are the initial conditions for the formation of shock waves?

• What do you understand by choking in nozzle flows?

• Is it possible that pressure and velocity decrease simultaneously?

• Distinguish between “Available energy” & Availability?

• What is a pure substance?

• What is a critical point? What is the value f critical temperature, pressure & volume of water?

• What is the sublimation curve, fusion curve & vaporization curve?

• What is Rayleigh Line & Fanno Line?

• What is normal shock & when it occurs?

• What is High-Grade Energy & Low-Grade Energy?

Heat & Mass Transfer

• What is Newton’s Law of cooling?

• What is Recuperator & Regenerators?

• Whether fin can actually reduce heat transfer? is it possible? When?

• What is the difference between Biot no. & Nusselt no?

• Which one is greater, thermal boundary layer or hydrodynamic boundary layer?

• What is film temperature in forced convection flow?

• What is a fully developed region and where it is applicable?

• What is the critical radius of insulation, explain clearly in terms of thermal resistance and heat transfer rate?

•  In what case do you recommend Fin?

• What is the difference between free convection & forced convection in what parameter forced & free convection depend?

Fluid Mechanics and Fluid Machinery

• What is the difference between impulse & reaction turbines?

• Explain unit speed, unit discharge unit power & specific speed.

• Explain NPSH, in which parameter it depends on.

• What is the jet ratio?

• What is the Deriaz turbine?

• Which turbine is good for the tidal power plant?

• What is the Navier-stroke equation?

• What are the significance of Non-Dimensional Numbers (Mach, Weber number)

Internal Combustion Engine

• What is the use of Carburetor in SI Engine, There is a trend towards increases of the injection system in Automobiles, Explain.

• Why Supercharging is not popular with SI Engines?

• What is the performance number?

• Explain Knocking in SI Engine & Mention, the factors that tend to reduce Knocking?

• Explain the difference between Knocking in SI Engine & CI Engine?

• How does “Turbulence” differ from “Swirl”?

• Name some Antiknock additive and explain the mechanism by which they reduce the knock?

Power Plant Engineering

• What is the slip ratio in the thermal power plant?

• In the Pendant superheater whether parallel flow or counter flow heat exchange between steam and flue gases.

• What happens to mass flow in the case of supersaturated flow?

• Why is the clearance provided in the reciprocating compressor?

• Explain turbojet & Rocket Engine.

• What’s the advantage of the compounding of the steam turbines?

• What’s are boiler mounting & accessory.

• Draw the sketch of the pulse jet engine. What are its main advantage & disadvantage?

• Explain the working principle of a scramjet engine, what is an advantage over the ramjet?

• What is the advantage of nuclear power plants over thermal power plants?

• What is the fast breeder reactor?

• What is the circulation ratio and what is its range in power plant?

• One 2-row Curtis turbine is equivalent to how many reaction turbines for the same value of blade velocity and angle of the nozzle?

• What are thermal neutrons?

• What is the breeding ratio?

• What is the application of jet and rocket technology? Which is used in missiles?

Refrigeration and Air-conditioning (RAC)

• What is the utility of a comfort chart?

• What is wet compression?

• To maximize COP what should be the condition of vapour at suction to compression?

• What is the range of NBP (normal boiling point) in the case of most refrigerants?

• Why the COP of CO2 gas is less and still why it is used in transport refrigeration?

• What are the most crucial parts of reciprocating compressors?

• How compressors are selected based on the type of refrigerant?

• What is the correlation between wet-bulb temperatures an adiabatic saturation temperature?

• Why the isothermal compressor is Desirable?

• What is a desirable property of ideal refrigerant?

• Define effective temperature & what is the optimum design condition for comfort for summer A/C?

Production Engineering

• Why arc is slowly extinguished in the case of arc welding?

• Which inert gas is commonly used for a thin workpiece and which inert gas for thick workpiece?

• What is friction welding?

• What is the difference between brazing & braze welding?

• Why hole basis system is adopted in manufacturing?

• What is the 3- 2-1 principle?

• Where diamond pin locator is used?

• How presses are rated?

• What is spring back?

• What is the difference between the fillet and corner radius?

• What are the overhead costs?

• Why depreciation is to be taken into account in industrial management?

• Why the breakeven point is important in any industry?

• What is the sine bar?

• What is the marginal cost and marginal revenue?

• What is shear and where it is provided in case of punching and blanking?

• What is the angle of bite?

• What is the extrusion ratio?

• What is gutter and where it is used?

• Which process is used for making nuclear reactor fuel rods?

• What is the difference between Amorphous and crystalline solids?

• What are the various methods of inspection of casting for internal & external defects?

• Why are allowances provided for in the production of patterns? What do they depend on?

• What is the difference between soldering & brazing?

• What is meant by solid-state welding explain?

• What is cold welding?

• Describe the principle behind resistance welding processes.

• What function should a lubricant perform in the manufacturing process?

• Explain the difference between punching & blanking.

• Explain the difference between discontinuous chips and segment chips.

• Explain the different types of tool wear.

• What is the difference between oblique & orthogonal cutting?

• What is the main difference between jig and fixture?

• What is AOQ?

• What is LTPD?

• What is Producer risk?

• What is Consumer’s risk?

• What is JIT approaches?

• What is group technology? What are its main advantages?

• Define the term “production & productivity.

• What is the significance of ISO 9000 series & 1400 series?

• What is artificial intelligence?

• Which welding process does not require any filler material?

• What is tack weld?

• Which process used for cutting thicker plates?

• Where drooping characteristics of power source is required in arc welding?

Material Science

• What is quazi-crystal?

• What do you understand by free cutting steel? What elements are usually added to make a steel free cutting, & how they make the steel free cutting?

• Explain the various methods of hardening of steel?

• What do you understand by the term “Arrest point” in connecting with the heat treatment of plain carbon steel?

• What influence does grain size have on the mechanical properties of metals?

• Describe the difference between brittle and ductile fracture.

• What is the difference between natural & artificial aging?

Additional Technical Questions

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If you find these study material useful, do share it with other students.

Related Posts (PSUs Interviews Experience) :

• IOCL INTERVIEWS Experience (2018)

• ONGC Interview Experience (Drilling)

• BHEL INTERVIEWS Experience

• NPCIL Interview Experience

• ISRO Interview Experiences

• ESE 2019 AIR 14 INTERVIEW Experience

IOCL INTERVIEW EXPERIENCE | 2019

#1 My IOCL Interview experience
Rank-416
Panel-delhi-2
3M+1F
F1-to aap Himachal se he.
As I have mentioned Himachal as my address,
Me- no ma'am, I am from Jhansi Himachal se mera Mtech chal rha he
M1- where in himachal
Me-told them
M1- so you've completed your Mtech
Me- told them
F1- so tell me something about yourself
Me- tell them about myself including my training and project
M2- so tell me about your project
Me- told them
M3- so how did you measure the efficiency of your wind turbine
Me- sir I have copied the concept from a group of Harvard researchers, they claimed that the
angle of attack in a humb back whale flipper can be 40% more steeper before the actual stall
takes place hence increases the lift force and decreases the drag force therefore the overall
efficiency of the turbine increases.
M3- ok tell me about your industrial training
Me- sir meri industrial training ek observatory type training thi jisme hame different instruments
or machines jo Indian railways me instmaal Hoti he vo observe krni thi, mjhe ek separate
machine or di gyi thi observation k liye jo ki turbosupercharger thi
M2- so what is a turbosupercharger
Me- it is used to Increase the volumetric efficiency and power output of the engine by increasing
the mass flow rate
M1- ek or koi use he iska batao kya he
Me- sir shayd yahi do he volumetric efficiency of power output increase krna or to mjhe pata nhi
M3- ok draw the diesel cycle on board with and without the use of supercharger
Me- sir cycle me to pata nhi kese Banega supercharger but i'll try, draw the Diesel cycle
M3- explain all the processes
Me- explained
M3- ok ab isme batao supercharger Kahn pr lagega
Me- sir exactly to mjhe pata nhi lekn heat addition k aas paas hi lagega,
Increases the cut off ratio bcoz I think it increases the power output but it was wrong
M3- achha Jese agr hmne heated air supply ki engine me to kya effect hoga power input me
Me- sir power input kam lagega heat krne k liye sir ko kiuki air pehle se hi heated he
M1- yahi to me pooch raha tha tumse ki ek or kya use he supercharger ka
Me- sir me vo pakad nhi paya tha ki aap kya Janna chah rhe the
M1- acha acha koi nhi Abhi to aa gya na
M2- tell me about different types of pumps and where they are used
Me- sir pump do type k hotey he ek to rotodynamic or doosra positive displacement,
rotodynamic aapke tb use hotey he jab pressure difference kam or volumetric flow rate zada
chahiye ho or positive displacement aapke tab use hotey he jab pressure difference zada or
volumetric flow rate kam chahiye ho, or positive displacement pump aapke viscous fluid k liye
use hotey he and rotodynamic kam viscous fluid k liye
M2- tell me about different parts of a rotodynamic pump
Me- drew them and named them all
M1- achha cavitation kya hota he
Me- told them
M1- Kahn se hota he metal erode
Me- at the eye or inlet of pump
M1- nhi kahin or hota he vo batao
Me- impeller blades me
M1- yes correct, ab agar cavitation Ko rokna he to kya krengy
Me- inlet pipe ki length Ko kam kr dengy
M1- nhi kch or batao hme pipe ki length utni hi rkhni he
Me- pressure losses kam krne ki koshish krengy inlet pipe me, smooth Bana dengy inlet pipe Ko
jisse uska friction factor kam ho jaye
M3- or kya kr sakte he
Me- sir Jese friction loss hmara (fLV^2/2*g*D) k equal hota he to hm ya to velocity Ko kam kr
sakte he ya pipe k Dia Ko increase kr sakte he taaki friction losses kam ho or impeller eye pr
zada se zada pressure ho
M1- hm pipe ka Dia or length change nhi kr sakte existing system he ye sb na to reservoir pump
k paas ja sakta he or na hi pump reservoir k paas keval operating conditions hi change ho sakti
he ab batao kese rokengy cavitation Ko.
Me- sir velocity hi kam kr sakte he fir bs
M1- nhi impeller constant speed se ghoom rha he
Me- to fir nhi pata sir or kch
M1- arre volumetric flow rate kam kr dengy
Me- to sir vo velocity se hi to related he, mene bataya to tha aapko
M3- yes yes you were correct
M1- achha agr cavitation hoga to kya problem ho jayegi
Me- sir pump me bubbles form hone lagengy jisse ki turbulence aa jayegi
M1- or kya problem Hoti he jo cavitation Ki vajah se aati he
Me- don't know sir bus turbulence or bubbles ka pata he jisse ki metal erode hone lagta he
pressure waves ki vajah se
M2- achha to tmne industrial training me or kya seekha
Me- sir kiuki meri training Indian railways me thi to usme mene different locomotives jo Indian
railways me use Hoti he unke codes k baare me seekha Jese agr code WDG he to G denotes for
goods locomotive
Agr WDP to P denotes for passenger locomotive
M2- achha wheels jo bante he railways me vo kisse bante he
Me- forging se
M2- casting se nhi bante
Me- casting se hi bante he lekn unhe forging se banaana chahiye
F1- achha to aangey padhne ka kch Mann he
Me- nahi ma'am ab bus job mil jaye to settle hona he
M1- or jo Mtech kr rahe ho vo
Me- sir vo mene join hi isiliye ki thi ki gate ki preparation kr saku kiuki ghr me nhi ho paata he
M3- achha ok you can leave
Me- thank you sir
M3- and best of luck for your future
All over the panel is very friendly, interview time of every candidate is around 15 minutes

GD topic- why Indians are so much obsessed with English and should hindi be made our
common language
GT topic- suppose the Government appointed you all as a team to change the education pattern
in India how will you all design a new curriculum as the existing one has many deficiencies

#2 IOCL ME
4 JULY DELHI 2019
INTERVIEW: 5M 1F(HR) , 15-20 mint

Q- Where are u from?
Q- College and place?
Q- College me sb kaisa tha, koi dikkat? Prefer kroge?
Q- Papa ko kitne saal hue retire hue?
Q- If given good mtech clg would u go for it? Why not(I answered bcz I have to settle)
Q- College k baad ek saal k gap me kyu ni kuch kiya fir?
Q- Which PSUs u got call? Which u will Prefer nd why?
Q- training kaha se ki, ( I hv done from reliance thermal PP)
Q- Waha to bht achi job lgegi Waha kyu ni gye?
Q- Any disadvantage in PSUs?
Q- Y PSUs?
Q- How u r hardworking?
Q- about strengths?
Q- about hobbies?
Q- any problem with remote locations?
Technical:
Asks mainly from the subjects I have written in the biodata form( mine thermo, FM, MS)
Q- What is alpha, gamma in iron carbon diagram?
Q- their difference ?
Q- eutectic, eutectoid point?
Q- their temperature range?
Q- Which is denser out off ferrite and austenite? Nd Y?
Q- about pearlite?
Explained with diagram on board.
Q- What to do if more viscous fluid is to be used in centrifugal pump?( they give hint to reach
upto the answer)
Ans- more power needed, so we have to reduce discharge
Q- How u will reduce discharge?
Ans- By partially closing delivery valve
Q- What will happen if delivery valve completely closed?
Q- what will b the Theroritical power consumption at the moment?
A- zero
Q- Affinity law of pump?
A- H directely proportion to Dsquare, Q directely proportion to D, P directly proportional to D
cube.
Panel was supportive.

GD- Is it necessary to implement 33% women reservations in Parliament.
GT- there r 6000 low profit petrol pumps in U.P, make a plan to revive them.
Two observers - 1M 1F. Both note down about each candidate seriously.


#3 IOCL Interview
GD:- 1. Children participating in the reality shows
         2. Impact of violence of Bollywood movies in real life
         We choose the 2nd one.
GT:- plan a city form IOCL in a remote location keeping sustainable development in mind and
eco-friendly environment.

Panel members 1F +4M PI :-
Q1.Tell something about u with ur family background.
Q2. What's gate marks and rank.
Q3. Why not private companies why psu?
Q4. Have u got selected for campus interviews in ur college ( yes sir ) why left that company ?
Q5. If have 2 options job in TATA and in PSU which will u choose and why ?
Q6. What is deaerator and where it is kept above below or at the ground ?
Q7. Which is more efficient gas turbine or steam turbine and why ?
Q8. Difference between open and closed cycle gas turbine?
Q9. Have you ever done welding ?(no sir ) what is difference between single groove and double
groove welding?
Q10. How detonation or knocking happens in CI engine?
Q11. What may be the probable reason for knocking in CI engine since ignition temperature
remain constant ?
Q12. What is the governer and where it is placed in steam powerplant?


#4 IOCL Interview Experience
Date: 2-7-2019
Venue: MUMBAI
GD topic: "Is the world moving towards the end of globalization"
GT topic: "Prepare a plan to eradicate illiteracy from rural and remote areas in India"

Interview Panel: 4M + 1F
Q1: How do your friend call you?
Q2: Introduce yourself
Q3: Tell about your goals in life
Q4: What are the things you are good at?
Q5: How can you be beneficial for the company?
Q6: Looking at my surname they asked, you people are mostly into business, then why do you
want to go for a job?
Q7: Why Iocl?
Q8: Have you applied for any other PSU?
Q9: What do IOCL do? Tell about Some products of IOCL
Q10: Can you find any petrochemical product here infront of you?
Q11: 1-2 technical question related to discipline and further discussion on them.
Overall interview was good and the panel was very supportive.


#5 IOCL Interview Experience
Date 28/06/19
Gd topic : Problem of forced migration and what should be done by govt and people to not let
people die because of it
GT topic: Suggest a solution to let small shopkeepers compete with global companies

Interview Panel: 4M + 1F
1.Kuch apne baare mein bataiye
2.one question about hobby
3. what is your favorite subject
I said basic thermodynamics
4 Questions on Second law of thermodynamics, First law, entropy, enthalpy, Latent heat and its
value for water during fusion and vaporization, Phase and its types were asked
5 Apke jeevan mein Sabse khusi ka moment bataiye
6.Iocl ke baare mein kya acha laga
I told about its awards, the work they are doing in renewable energy, their profit and turnover
7.No of refineries in iocl, what can you contribute there as mechanical engineer
8 Question on Radiator used in car and type of coolant used in it
9.What is heat exchanger and the problem occurred in it during usage
10. There are four qualities honesty, hardwork, talent and positive attitude which you will
consider most suitable and why?
I said positive attitude can give clarity in mind during adverse situation and with wrong attitude it
is difficult to cope up with even situations with small adversity. I have also given my example.

#6 IOCL Interview(mechanical)
Date - 26th June 2019
Rank-1006
*HR QUESTIONS*
Q. Why do you want to join PSU or govt organisation?
Q. What were you doing for two years ?
Q. What are your two strengths?
Q. In what areas do you think you can improve?
Q. What do you do other than studies?
Q. Tell us more about yourself. Something more.
Q. If there is a boss/colleague and you don't like him. What will you do in that situation?
*TECHNICAL QUESTIONS*
Q. What is your favourite subject?
Q. How does IC engine work?
Q. What is turbocharger? How does it work?
Q. What are the elements of steel? Define alloying elements. Which metal shoul be added to
improve corrosion resistance?
Q.which bearing is used in centrifugal pump?
Q. What is the function of bearing? what is bearing? Types of bearing?
Q. How will you choose for a particular application?
Q. What types of lubrication is used in journal bearing?
Q. What is ductility?
Q. What are advancement in IC engine?


#7 Iocl Interview- 01/07/2019
Delhi-2, rank 845
GT- as a board directors how to improve Indian institute ranking in world
Gd- why anyone wants to speak and hear English why not Hindi like as Chinese in China .
Interview- 
introduce yourself.
1. Stainless steel?
2. Fn of chromium and nickel in stainless steel.
3. Centrifugal pump delivery pressure?
4. Division of iocl
5. Refineries of iocl
6. Main issue of the country at this time
7.about iocl
8.lpg filling device ,as my training from lpg bottling plant.
9. Cylinder joining by which welding ?.


#8 IOCL Interview   01/07/2019
Venue:- IiPm Gurgaon
AIR 416 mechanical
GD topics
1. Can e-learning substitute classroom learning in the future.
2. Retirement age for the politician
GT topic : Water conservation solution to water cricis

Interview questions
1. Tell us about yourself
2. What you know about IOCL
3. Explain your b.tech project
4. Summer training me kya sikha
5. Explain gas turbine and steam turbine.
6. Why we see more steam power plant than GT power plant
7. If you install centrifugal pump in your home to supply water to 2nd floor, but water is not
pumping... What could be the reasons?
8. What are the components of centrifugal pump?
9. How many IOCL refineries are there in country?
10. How much % of crude oil india import?

#9 IOCL Interview date :01-07-2019
Rank 309

5 people in panel ( 4M + 1F)
1) Gate rank
2) wht u were doing in 2 years gap
3) last year gate rank
4) INTRODUCE YOURSELF
5) WHAT IS YOUR AIM
6 ) ON WHICH MEGAPROJECTS IOCL WORKING
7) PETROCHEMICAL BRAND OF IOCL
8) PRODUCTS SELL BY IOCL
9) WHAT IS KRISHAK SEVA KENDRA
10) 2-3 GOOD AND BAD THINGS YOU OBSERVED IN PETROL PUMP
11) hobby
12) india's biggest football player
13) who is top scorer of football in 2018-19 and 2017-18
Then they asked favourite subject
14) why we dont use 2 stroke in cars
15) which is more efficient ci or si and why
16) why there are two silencers in cars like audi, mercedes

#10 IOCL Interview Gate rank- 207
Delhi-2 27/06/19
GD- are eclasses better than classes?
GT- you are IOCL csr head and you have given a budget of 700 crore how will you manage it in 2
years?
Interview: 3 members (2M+1F)
1.introduce yourself.
2.what was you previous job role?
3. Why left the job?
4. Why psu(as I told to get a psu left previous job)
5. Asked some questions on my subjects what I read in btech(mechatronics and Modb).
6. Asked my extracurricular activities in btech.
7.asked me about centrifugal pump, working and it's components.
8. Function of casing its shape.
9.stress starin curve
10. Ductility
11. What is motor how it works?


#11 IOCL Interview AIR 32 
Date 27.06.19 Delhi 
GD: 1. Is making law sufficient to stop violence against women
        2. Is modern science making society undemocratic.
        We chose 1st
GT: Assume delhi is left with 10000L of water. Design a plan to cope up with water scarcity
problem at Delhi

Interview 3 (M) members panel
1.Introduce urself
2. Why u want to join Iocl.
3.Th4n jokingly asked apne ye to bta diya ki aap iocl kyu join krna chaahte, yr bhi bataao ki aap
apni existing company kyu chhorna chaahte. Vo bhi Psu h.
I jokingly replied. Kuch paane k liye kuchh khona bhi parta h.
4. You worked previously at Haldia West Bengal. Do u know about IOCL presence at Haldia?
5. If u will get posted at haldia what will be ur roles u think u can take up.
6. Since my experience was from maintenance,
What is maintenncr, fifferent types, different among them, ehat is autonaumous maint
What is condition based maintenance and preventive maintenece. How they differ
What is casting.
What challanges u faced.
How u increased uptime of plant
How can you replace preventive maintenance in modern way since it takes lot of man, money
and time.
What factors you see while doing casting.
How casting and metal cutting are different?
U said no problem in relocating and then said will not join CPCL. Explain.
Ok final question
Where do u see urself in 5 years if selected in refinery.
Very friendly panel.
Both Hindi and English can be used.

#12 My IOCL experience
Rank :- 659
Venue:- Delhi 2
Gd Topic:
1)Is technological automation leads to unemployement.
2)should gender unequality be a barrier in entry in religious places

GT Topic:- Suggest ways to overcome cyber addiction in childrens
PI:-
1)Kha se ho..tell about bishnoi community as i m from bishnoi community
2)iocl divisions kitni h
3)CPCL join kr loge agar wo milta h to
4)draw rankine cycle
5)what else you study in power plant
6)what is yield stress and ultimate stress.

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SAIL Interview Experiences

SAIL Interview 28/07/2018

GD: Should who have minimum graduation qualification and good in speaking english and having knowledge of operating computers only allowed to government organization and psu and others are allowed to unorganized organization?

GT: Qualities of a good manager of PSU
8 qualities are given, we have to give ranking individually and then by discussing with the group.

Case study: Two page case is given having information about different TV broadcasting groups from different countries who want to take license in India, we have to choose a better one for India as per Supreme Court's verdict.

Personal Interview Panel - 4 M
No introduction,
Directly M1, Aap aur hum kuch bate karenge and we have the opportunity to interview you and you may also have.
1. Asked about hometown.
Then that sir was telling himself about Kolhapur to others.
2. You have not written any games, don't you play any game?
(I told about my hobbies traveling and swimming)
3. Have you covered entire Maharashtra?
(I told about some forts, then the same sir was explaining others about Shivaji Maharaj and his forts himself.)
4. Then some questions on extracurricular activities.
5. Tell about your family.
M2- 
6. Suppose you are leading some of the employees and one of them is not doing his duties properly. So you have 3 options fire him, consult him or tell the superiors. What will you do?
7. Do you know the working environment in a steel plant?
Sir1- 8. Do you know our plants are not in metro cities, then will you work in such area?
9. What are your favorite subjects?
(I told FM and Thermo)
10. What is the formula for flow?
11. What if we decrease the area?
12. Do you one number which is related to flying of planes?
13. Planes fly above or below 1 Mach?
14. At what Mach number jet plane fly?
(I said it is above 1 Mach but don't know exactly, they said it is 2 Mach)
15. Do you know about convergent-divergent nozzle?
16. What happen in it?
M3-
17. Do you understand hindi? Hindi me bat kar sakte hai?
18. Samzo aap train se travel kar rahe hai, lekin aapko seat nahi mili to niche baith ke travel karoge? Niche floor pe so jaoge?
M4-
19. Suppose, aap New Zealand and Papua New Guinea countries me ja rahe ho to kya tayari karoge?
Kis type ke kapde le jaoge?
M1- 20. As you know the working environment in steel plant is very harsh and you might be posted in mines also. Will you ready to work there?
It was around 17 minutes.

SAIL Interview : 23/07/2018

(4 member in interview panel)
1- Where you belong from?
2- where have you worked?
3- why you left ur previous job?
4- why SAIL
5- are you familiar with SAIL processes
6- what were the processes in ur previous organisation
7- ball bearing material Composition
8- how your previous experience will help you in SAIL
(I said team work, achieving targets, deadline management, supervision of people)
9- how team sprit works in an organisation
10 - why are you not going for post graduation
11- how are you going to adjust in south India?
12- why there is two year gap after 12th
13- what you like to do in ur free time
14- who is ur favorite criketer and why
15- have you applied for other PSU
16- what if you get selected in other PSU
(I said, I will join IOCL first)
17- what is Bessemer method
(total 15 to 20 min) 

 GD: (1.5 hour activity, total 4-panel members)
(9 candidates in a group, 5 min to think, 20 min to discuss, Preferably in English)
some people are saying that Public sector undertakings & Banks in India are running in losses and lots of fraud activities are going on,
So do you think govt should privatize or should close these organisations

GT: for national integration priortise the below given points and write down ur ranking then discuss among the group and again write down ur group ranking
(5 min for you then 10 min to discuss in group)
1- by writing the papers by boys & girls in school
2- 3 years compulsary army training for all who are able to do it
3- uniform civil code throughout the country
4- every day half an hour should be spended to read message of national leaders
5- by forcibly applying dictatorship for 20 years
6- Dissolution of states based on geopraphical area and language
7- provide reservation for intercasre marriage
8- censorship of media who promote religious debate
9- by sending youth of 18-20 age group in rural areas for 2 years
In last you have to come to a common consencus

Case study : (15 min to read, 2 min to put ur view, 10 min to discuss in the group)
There was a lengthy case of 2 pages to read then u have to suggest possible cause & remedies

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Related Posts (PSUs Interviews Experience) :

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Coal India MT Previous Year Solved Papers and Syllabus

Download Free Coal India Limited MT Old Question Papers

Exam Pattern for Coal India

Papers	Sections	No. of Questions	Time (in minutes)
Paper 1	General Awareness	25	25
	Reasoning	25	25
	Numerical Ability	25	25
	English	25	25
Paper 2	Professional Knowledge	100	100
Total		200	200

Coal India Mechanical Question paper and Solution 2017

Download Question Paper-I, 2 

Download Solution of Paper-I 

(General Knowledge/Awareness, Reasoning, Numerical Ability and General English)

Download Solution of Paper-II  

(Coal India Management Trainee Last Year Papers – Mechanical)

Coal India Mechanical Question paper and Solution 2020

                         

Official Syllabus for the post of Mechanical (Paper 2): 

Engineering Mechanics: Free-body diagrams and equilibrium; trusses and frames; virtual work; kinematics and dynamics of particles and of rigid bodies in plane motion; impulse and momentum (linear and angular) and energy formulations, collisions.

Mechanics of Materials: Stress and strain, elastic constants, Poisson's ratio; Mohr’s circle for plane stress and plane strain; thin cylinders; shear force and bending moment diagrams; bending and shear stresses; deflection of beams; torsion of circular shafts; Euler’s theory of columns; energy methods; thermal stresses; strain gauges and rosettes; testing of materials with universal testing machine; testing of hardness and impact strength.

Theory of Machines: Displacement, velocity and acceleration analysis of plane mechanisms; dynamic analysis of linkages; cams; gears and gear trains; flywheels and governors; balancing of reciprocating and rotating masses; gyroscope. Vibrations: Free and forced vibration of single degree of freedom systems, effect of damping; vibration isolation; resonance; critical speeds of shafts.

Machine Design: Design for static and dynamic loading; failure theories; fatigue strength and the S-N diagram; principles of the design of machine elements such as bolted, riveted and welded joints; shafts, gears, rolling and sliding contact bearings, brakes and clutches, springs. 

Fluid Mechanics: Fluid properties; fluid statics, manometry, buoyancy, forces on submerged bodies, stability of floating bodies; control volume analysis of mass, momentum and energy; fluid acceleration; differential equations of continuity and momentum; Bernoulli’s equation; dimensional analysis; viscous flow of incompressible fluids, boundary layer, elementary turbulent flow, flow through pipes, head losses in pipes, bends and fittings. 

Heat-Transfer: Modes of heat transfer; one dimensional heat conduction, resistance concept and electrical analogy, heat transferthrough fins; unsteady heat conduction, lumped parameter system, Heisler's charts; thermal boundary layer, dimensionless parameters in free and forced convective heat transfer, heat transfer correlations for flow over flat plates and through pipes, effect of turbulence; heatexchanger performance, LMTD and NTU methods; radiative heat transfer, Stefan- Boltzmann law, Wien's displacement law, black and grey surfaces, view factors, radiation network analysis.

Thermodynamics: Thermodynamic systems and processes; properties of pure substances, behaviour of ideal and real gases; zeroth and first laws of thermodynamics, calculation of work and heat in various processes; second law of thermodynamics; thermodynamic property charts and tables, availability and irreversibility; thermodynamic relations. 

Applications: Power Engineering: Air and gas compressors; vapour and gas power cycles, concepts of regeneration and reheat. 

I.C. Engines: Air-standard Otto, Diesel and dual cycles. Refrigeration and airconditioning: Vapour and gas refrigeration and heat pump cycles; properties of moist air, psychrometric chart, basic psychrometric processes. 

Turbomachinery: Impulse and reaction principles, velocity diagrams, Pelton-wheel, Francis and Kaplan turbines. 

Engineering Materials: Structure and properties of engineering materials, phase diagrams, heat treatment, stress-strain diagrams for engineering materials. 

Casting, Forming and Joining Processes: Different types of castings, design of patterns, moulds and cores; solidification and cooling; riser and gating design. Plastic deformation and yield criteria; fundamentals of hot and cold working processes; load estimation for bulk (forging, rolling, extrusion, drawing) and sheet (shearing, deep drawing, bending) metal forming processes; principles of powder metallurgy. Principles of welding, brazing, soldering and adhesive bonding. 

Machining and Machine Tool Operations: Mechanics of machining; basic machine tools; single and multi-point cutting tools, tool geometry and materials, tool life and wear; economics of machining; principles of non-traditional machining processes; principles of work holding, design of jigs and fixtures. 

Metrology and Inspection: Limits, fits and tolerances; linear and angular measurements; comparators; gauge design; interferometry; form and finish measurement; alignment and testing methods; tolerance analysis in manufacturing and assembly.

Computer Integrated Manufacturing: Basic concepts of CAD/CAM and their integration tools. 

Production Planning and Control: Forecasting models, aggregate production planning, scheduling, materials requirement planning. 

Inventory Control: Deterministic models; safety stock inventory control systems. 

Operations Research: Linear programming, simplex method, transportation, assignment, network flow models, simple queuing models, PERT and CPM.

You can buy Books :
(1)  Mechanical Engineering Coal India Management Trainee Tier I & II Exam 2020 Guide

(2) Mechanical Engineering (Conventional and Objective Type) 5000+ Objective Questions with Hints - Kurmi

Related Posts: 

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