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Mechanical Engineering Practice Questions
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Mechanical Engineering Practice Questions
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1. The piston of an oilengine - of area 0.0045 m3moves downward 75 mm - drawing in 0.00028 m3 of freshair from the atmosphere. Thepressure in the cylinder isuniform during the process at80 kPa - while the atmosphericpressure is 101.325 kPa. Findthe displacement work doneby the air finally in thecylinder.
2. In orthogonal turning of alow carbon steel bar ofdiameter 150 mm withuncoated carbide tool - thecutting velocity is 90 m/min.The feed is 0.24 mm/rev andthe depth of cut is 2 mm. Thechip thickness obtained is0.48 mm. If the orthogonalrake angle is zero - and theprincipal cutting edge angle is90o - the shear angle indegrees is
3. Tool signature comprisedof
4. Which one of the followingconfigurations has the highestfin effectiveness?
5. The principle of materialremoval in Electrochemicalmachining is
6. A perpetual motionmachine of the first kind i.e. amachine which producespower without consuming anyenergy is
7. An optical gauge workson the principle of
8. Rankine cycle efficiencyfor a power plant is 29%. Thecarnot cycle efficiency will be
9. A ring gauge is used tomeasure
10. The flatness of a machinebed can be measured using
11. Which one of thefollowing instruments iswidely used to check andcalibrate geometric features ofmachine tools during theirassembly?
12. All the threadcharacteristics can bemeasured precisely with
13. Friction at the tool-chipinterface can be reduced by
14. For a four bar linkage intoggle position - the value ofmechanical advantage is
15. Response is defined asthe measure of a system isfidelity to purpose. Theresponse of measuringinstrument may be consideredto the following cases.
16. An involute pinion andgear are in mesh. If both havethe same size of addendum - then there will be aninterference between the
17. The transmission angle ismaximum when the crankangle with the fixed link is
18. 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
19. A 100 W electric bulb wasswitched on in a 2.5 m × 3 m× 3 m size thermally insulatedroom having a temperature of20°C. The room temperatureat the end of 24 h will be
20. In order to have aninterference fit - it is essentialthat the lower limit of theshaft should be
21. A furnace is made of ared brick wall of thickness 0.5m and conductivity 0.7 W/mk.For the same heat loss andtemperature drop - this can bereplaced by a layer ofdiatomite earth of conductivity0.14 W/mk and thickness
22. A flywheel fitted in asteam engine has a mass of800 kg. Its radius of gyrationis 360 mm. The startingtorque of engine is 580 N-m.Find the kinetic energy offlywheel after 12 seconds?
23. A ball - falling verticallystrikes a 30° frictionlessinclined plane and reboundshorizontally. The coefficient ofrestitution will be
24. In case of Investmentcasting
25. Two identical ballbearings P and Q areoperating at loads 30 kN and45 kN respectively. The ratioof the life of bearing P to thelife of bearing Q is

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