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Mechanical Engineering Practice Questions
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Mechanical Engineering Practice Questions
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1. For the givenstatements: I. Mating spurgear teeth is an example ofhigher pair. II. A revolute jointis an example of lower pair.Indicate the correct answer.
2. A Mohr-Ÿs circle reducesto a point when the body issubjected to
3. 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
4. There are two points Pand Q on a planar rigid body.The relative velocity betweenthe two points
5. In the assembly of pulley - key and shaft
6. Brayton cycle can not beused in reciprocating enginesfor same adiabaticcompression ratio and workoutput because
7. Ratio of moment of inertiaof a circular body about its xaxis to that about y-axis is
8. In a belt-drive if thepulley diameter is doubledkeeping the tension and beltwidth constant - then it will benecessary to
9. In a Pelton wheel - thebucket peripheral speed is10m/s - the water jet velocityis 25 m/s and volumetric flowrate of the jet is 0.1 m3 /s. Ifthe jet defletion angle is 120°and the flow is ideal - thepower developed is
10. A plate fin of length L =1.5 cm and thickness 2 mmhas efficiency (if k = 210 W/mk - h = 285 W/m2k)
11. A link OP is 0.5 m longand 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
12. The quality of ameasuring instrument whichcharacteristics the ability torespond to small change ofthe quantity measured iscalled
13. Three fins of equallength and diameter but madeof aluminium - brass and castiron are heated to 200°C atone end. If the fins dissipateheat to the surrounding air at25°C - the temperature at thefree end will be least in case of
14. A 20 cm-dia - 1.2 m longcylinder loses heat from itsperipheral surface byconvection. Surfacetemperature of the cylinder isconstant at 100°C and thefluid temperature is constantat 20°C. The averageconvection heat transfercoefficient over the surface ofthe cylinder is 25 W/m2 K.The heat transfer rate is
15. Which of the following is apositive locking device?
16. Friction at the tool-chipinterface can be reduced by
17. 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
18. In current carryingconductors - if the radius ofthe conductor is less than thecritical radius - then additionof electrical insulation isdesirable - as
19. Loose Piece pattern are
20. There are two points Pand Q on a planar rigid body.The relative velocity betweenthe two points
21. Reduction in friction angledecreases cutting force R.Reduction in friction angleincreases chip thickness S.Reduction in friction angledecreases chip thickness
22. In a four-bar linkage - Sdenotes the shortest linklength - L is the longest linklength - P and Q are thelengths of other two links. Atleast one of the three movinglinks will rotate by 360° if
23. A single point cutting toolused to get
24. For brittle materials likebrass - the rake angle providedis
25. Continous chips areformed while machining of

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