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Mechanical Engineering Practice Questions
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Mechanical Engineering Practice Questions
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1. In a stressed body - anelementary cube of material istaken at a point with its facesperpendicular to X and Yreference axes. Tensilestresses equal to 15 kN/cm2and 9 kN/cm2 are observed ontheses respective faces. Theyare also accompanied byshear equal to 4 kN/cm2. Themagnitude of the principalstresses at the point are
2. A circular disc ofdiameter -žd-Ÿ is slowly rotatedin a liquid of large viscosity mat a small distance h from afixed surface. The minimumtorque required to maintainan angular velocity w will be
3. The number of strainreadings (using strain gauges)needed on a plane surface todetermine th principal strainsand their directions is
4. A circular solid disc ofuniform thickness 20 mm - radius 200 mm and mass 20kg - is used as a flywheel. If itrotates at 600 rpm - the kineticenergy of the flywheel - inJoules is
5. A fathometer works on thefoundary work comprises ofprinciple of
6. A phenomenon ismodelled using n dimensionalvariables with k primarydimensions. The number ofnon-dimensional variable is
7. If cohesion betweenmolecules of a fluid is greaterthan adhesion between fluidand glass - then the free levelof fluid in a dipped glass tubewill be
8. The buckling load in asteel column is
9. For non sysmetric shapesuitable casting method is
10. Rankine cycle efficiencyfor a power plant is 29%. Thecarnot cycle efficiency will be
11. The most efficient rivetedjoint possible is one whichwould be as strong in tension - shear and bearing as theoriginal plates to be joined butthis can never be achievedbecause
12. For a Newtonian fluid
13. A ball is moving withvelocity 2 m/s towards aheavy wall moving towardsthe ball with speed 1 m/s.Assuming collision to beelastic - velocity of ballimmediately after the collisionwill be
14. A ball impinges directlyupon another similar ball atrest and itself comes to restdue to impact. Duringcollision - half of the kineticenergy gets dissipated. Thecoefficient of restitution willbe
15. Flux used in cupola duringmelting of cast Iron is
16. A link OP is 0.5 m longatmosphere which is at 25°Cand rotate about point O. Ithas a slider at permit B.Centripetal acceleration of Prelative to O is 8 m/sec2. Thesliding velocity of sliderrelative to P is 2 m/ sec. Themagnitude of Corioliscomponent of acceleration is
17. Which of the followingstatements is incorrect?
18. A single point cuttingtool with 12o rake angle isused to machine a steel workpiece. The depth of cut - thatis - uncut thickness is 0.81mm. The chip thicknessunder orthogonal machiningcondition is 1.8 mm. Theshear angle is - approximately -
19. In current carryingconductors - if the radius ofthe conductor is less than thecritical radius - then additionof electrical insulation isdesirable - as
20. Tool signature
21. Which one of thefollowing types of bearings isemployed is shafts of gearboxes of automobiles
22. Response is defined asduring melting of cast Iron is
23. Pressure in Pascals at adepth of 1 m below the freesurface of a body of water willbe equal to
24. A hydraulic turbinedevelops 1000 kW power for ahead of 40 m. If the head isreduced to 20 m - the powerdeveloped (in kW) is
25. Reduction in friction angledecreases cutting force R.Reduction in friction angleincreases chip thickness S.Reduction in friction angledecreases chip thickness

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