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Mechanical Engineering Practice Questions
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Mechanical Engineering Practice Questions
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1. Hot oil is cooled from 80to 50°C in an oil cooler whichuses air as the coolant. Theair temperature rises from 30to 40°C. The designer uses aLMTD value of 26°C. The typeof heat exchange is
2. A metric thread of pitch 2mm and thread angle 60º isinspected for its pitchdiameter using 3 -“ wiremethod. The diameter of thebest size wire in mm is
3. An involute pinion andgear are in mesh. If both havethe same size of addendum - then there will be aninterference between the
4. Biot number signifies theratio of
5. Fatigue strength of a rodsubjected to cyclic axial forceis less than that of a rotatingbeam of same dimensionsubjected to steady lateralforce. What is reason behindthis?
6. A hydraulic turbinedevelops 1000 kW power for ahead of 40 m. If the head isreduced to 20 m - the powerdeveloped (in kW) is
7. Main function of cuttingfluid is to
8. 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
9. The flatness of a machinebed can be measured using
10. One kilogram of water atroom temperature is broughtinto contact with a hightemperature thermalreservoir. The entropy changeof the universe is
11. Volume of a cube of sidetool is perpendicular to thedirection of tool travel inl and volume of a sphere ofredius r are equal. Both thecube and the sphere are solid - and composed of the samemeterial. They are being cast.The ratio of the solidificationtime of the cube to that of thesphere is
12. A solid disc of radius rrolls without slipping on ahorizontal floor with angularvelocity w and angularacceleration a. The magnitudeof the acceleration of the pointof contact on the disc is
13. 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.
14. Emissivity of a body isequal to absorptivity if thebody is
15. In a counterflow heatexchanger - cold fluid enters at30°C and leaves at 50°C - whereas the hold fluid entersat 150°C and leaves at 130°C.The mean temperaturedifference for this case is
16. A perpetual motionmachine of the first kind i.e. amachine which producespower without consuming anyenergy is
17. Which one of thefollowing instruments iswidely used to check andcalibrate geometric features ofmachine tools during theirassembly?
18. There are two points Pand Q on a planar rigid body.The relative velocity betweenthe two points
19. The heat transfer Q - thework done W and the changein internal energy DU are allzero in the case of
20. Friction at the tool-chipinterface can be reduced by
21. A fluid flowing over a flatplate has the following properties. Dynamic viscosity:25 × 10-“6 kg/ms Specific heat:2.0 kJ/kg K Thermalconductivity: 0.05 W/mk Thehydrodynamic boundary layerthickness is measured to be0.5 mm. The thickness ofthermal boundary layer wouldbe
22. In current carryingconductors - if the radius ofthe conductor is less than thecritical radius - then additionof electrical insulation isdesirable - as
23. In a belt-drive if the pulleydiameter is doubled keepingthe tension and belt widthconstant - then it will benecessary to
24. Which of the following is apositive locking device?
25. For an opaque surface - the absorptivity

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