Mechanical interview questions


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Mechanical interview questions

  1. 1. TECHNICAL QUESTIONS – MECHANICAL ENGINEERING1. What is the material of Crank Shaft?2. Energy stored in the spring when it is fully compressed without any deformation? Ans. Resilience or proof resilience3. Lower spindle speed in lathe is necessary for?4. What is the equation governing kinematic links and pairs?5. Pick out the wrong statement a.Joule cycle consists of 2 constant volume processes and 2 adiabatic processes b.Otto cycle consists of 2 constant volume processes and 2 adiabatic processes c.Ericsson cycle consists of 2 constant volume processes and 2 adiabatic processes d.None of the above6. The angle between face of the tool and plane parallel to the base of the tool is?7. Bevel gears are used for transmitting torque between? a.Intersecting & coplanar shafts b.Non-intersecting & non-coplanar shafts c.Non-parallel & non-coplanar shafts d.None of the above8. Expansion process in Otto cycle lasts? a.from TDC to BDC b.30 degrees before TDC till 50 degrees before BDC c.30 degrees after TDC till 50 degrees after BDC d.none of the above9. Which type of thread is more effectve for power transmission in one direction? a. square b. acme c. buttress10. The state of a liquid during evaporation? a. vapour b. steam c. water vapour11. For same compression ratio which of the following cycles is more efficient? a. otto b. diesel12. Throttle valve is used in steam engines to a.control pressure of steam b.control volume of steam c.control temperature of steam d.none of the above13. 24 & 2 in M24X2 represent which of the following two parameters respectively?14. Unit of Entropy ? Ans: J/kg K or kJ/kg K.15. A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m. What is the resistance force given by sand?16. Ratio of specific heats of air?17. A body weighs 3 kg in air. If it is submerged in a liquid, it weighs 2.5 kg. What is the specific gravity of the liquid.?
  2. 2. TECHNICAL QUESTIONS – MECHANICAL ENGINEERING18. Two cars travell in same direction at 40 km/hr at a regular distance. A car comes in a opposite direction in 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between them?19. Composition of bronze? Ans; Copper & zinc20. Compostion of stainless steel? Ans: iron & chromium & nickel & carbon.21. CI is manifactured in which process? Ans: cupola process.22. What percentage of carbon is preset in pig iron? Ans: 4.5 to 6%.23. Water is available at 10m height. What is the pressure available? Ans:pressure=density*g*height; p=1000*9.81*10; p=98100N/m2.24. What will happen if the speed of the centrifugal pump doubles.25. The unit eV is widely used in ? Ans: Nuclear and atomic physics.26. What will happen to the resistance, when the diameter of the conductor is doubled?27. The power comsumed by a electrical device is 1000W at 250V, What is the resistance in the device? Ans:Power=Voltage*current;Current=Power/Voltage,Current, I=1000/250=4amps, V=IR, Therefore R=250/4=62.5 ohms.28. Why DC current is not used in transformer.29. On what principle the sonar/ radar works?30. Bending moment diagram for the UDL is in what shape?31. Function of the distributor in petrol vehicles? Ans: Spark timing.32. Which is not present in CI engines? Ans: carburrettor.33. What will happen if one cylinder recieves more amount of fuel spray from injectors than other injectors34. Purpose of draft tube in hydraulic turbines? Ans: The purpose of a draft tube is toconvert some of the kinetic energy of the flow from the runner (the rotating part of the turbine) intopressure energy and thereby increase the efficiency ofthe hydro power turbine.35. What is the effect or reheater in the gas turbine? Ans: The advantage of reheater is significantly increased thrust; the disadvantage is it has very high fuel consumption and inefficiency.36. Problems in involving with fricition coefficient.37. Factor of safety = Yeild stress/Working stress.38. Which is the example of non parallel power transmission?
  3. 3. TECHNICAL QUESTIONS – MECHANICAL ENGINEERING Ans: Universal coupling.39. For perpendicular shafts worm gear is used.40. A planet gear with 25 teeth is meshed with a sun gear of 100 teeth. Both are connected using a arm. How many rotations are needed for planet gear to complete one rotation around the sun gear?41. What is equivalent spring constant for spring in parallel?42. How are tungsten and sintered composite materials are machined? Ans: Electro Discharge Machining, EDM.43. Critical stress at which material will start to flow ? (a)yield (b)ultimate tensile stress (c) proof stress (d) none o the above.44. Maximum degree of freedom in space? Ans. 645. Bearing which will take axial and radial loads? (a) thrust bearing (b) deep groove (c) taper roller46. volume of water per cubic metre of air. (a)specific volume (b) specific gravity (c) vapour pressure (d) none of above47. fluid is flowing through a frustum of cone. what is the nature of graph of velocity Vs. c/s area. {flow = velocity X c/s area} (a) parabola (b) hyperbola (c) y=mx+c (d) x=x.48. Fluid in a pipe having no change in profile with change in length of pipe ...explain type of flow.? a)Laminar b)Turbulent c)fully developed profile (ans) d)steady flow.49. Whic are correct I) Navier Stokes Eq. is of momentum conservation eq.
  4. 4. TECHNICAL QUESTIONS – MECHANICAL ENGINEERING II)bernoulis eq. is for viscous flow III) REYNOLD no. >3000 always for turbulent flow. a)I and II correct b)I and II not correct c)II and III correct d)II and III not correct50. Which can’t be removed during alloying from Fe alloys ? a) Co b) N c) Si d) As51. There are two ropes burning non uniformly (rate) and clock half an hour each. which can’t be clocked ? a) 1 Hr. b) 45 min c)15 min d)none52. Time dependent increase in length at steady temperature is called ? a) superplasticity b) creep c) fatigue d) none53. . Vicosity change with increasing temperature? a) decreases b) increases c) same d) first decreases and then increases.54. Direction of friction in bicycle tyres a) along motion b) opp. motion c) Front opp. motion and vice versa d) rear opp. motion and vice versa55. Specific gravity of a fluid ? a) density of fluid at 0`c / density of water at o`c. b) density of fluid at 0`c / density of water at T`c. c) density of fluid at T`c / density of water at o`c. d) density of fluid at T`c / density of water at T`c.56. Lateral strain / longitudinal strain ? a) Poission,s Ratio b) Bulk Modulus
  5. 5. TECHNICAL QUESTIONS – MECHANICAL ENGINEERING c) Modulus Of Elasticity d) None57. 10 coins & 1 defected coin and 2 weighs Find min weighs req. to detect faulty coin a) 2 b)3 c)4 d)558. A cantilever beam loaded at free end find reinforcement place ? a) AT neutral axis b) above neutral axis c) below neutral axis d) above and below neutral axis59. A ball dropped from H height and moves 80% of height each time.Total dist. Covered? a) 4H b) 5H c) 7H d) 9H60. punching a sheet of D dia and T thickness and S ultimate tensile stress a) 3.14 DTS b) 3.14TS X D^2 c) 6.28 DTS d)6.28 TS x D^261. . Microstructure after quenching a) Mertensite b) pearlite62. In V belt drive contact is made on? a) bottom b) sides c)bottom and sides63. Section modulus of hollow shaft? Ans: PI/32*(D4-d4)/D.64. Down milling is also called Climb milling.65. Drilling is an example of Oblique cutting.66. Section view of ’C’ washer?67. Deflection of simple supported beam carrying UDL 5/384*Wl4/EI?68. Flexible coupling is used because?69. Washer is used to provide bearing area?70. Initial tension is considered in?a)tension springs b)Compression springs c)Both.71. Kelvin plank law deals with? a) Conservation of work into heat b) conservation of heat into work72. Soldering alloy consists of Tin and lead.73. Why chromium is used in steel alloys? Ans: Prevent corrosion.74. High cutting speed is obtained while machining? a) HSS b) carbide c) CBN
  6. 6. TECHNICAL QUESTIONS – MECHANICAL ENGINEERING75. Metal forming is an example of chipless machining.76. Top rake angle is provided for Easy removal of chip.77. Alloying is done for increased strength and application.78. Transformer is used welding? a)to convert AC to AC b)AC to DC c) DC to AC79. Spheroidal cast iron is getting from Grey cast iron by adding Mg.80. In throttling process Enthalpy constant.81. 70 cc of engine means swept volume.82. Geneva mechanism is used for Intermittent motion.83. In NC system for profile machining? a)point to point b) contour motion c)paraxial motion.84. In centreless grinding, the grinding wheel and the regulating wheels rotate in the same direction.85. Centridal distance of a semi circle 4*r/3*pi.86. Highest packing factor: FCC.87. Which chart takes care of control attributes : Pchart, C chart, R chart88. Fixture is used for holding the workpiece without disturbing the tool path.89. Code for circular interpolation G 02.90. Order of transmission in a car: EFCPD-Engine Flywheel Clutch Propeller shaft Differential91. Reverse gear has less speed because? a).More speed is not necessary in reverse gear b).Steering is difficult in the reverse direction c).less space availability d).Design simplification92. Use of annealing : to relieve stresses.