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Mechanical Engineering Practice Questions
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Mechanical Engineering Practice Questions
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1. A perpetual motionmachine of the first kind i.e. amachine which producespower without consuming anyenergy is
2. In abrasive jet machining - as the distance between thenozzle tip and the worksurface increases - thematerial removal rate
3. A phenomenon ismodelled using n dimensionalvariables with k primarydimensions. The number ofnon-dimensional variable is
4. There are two points Pand Q on a planar rigid body.The relative velocity betweenthe two points
5. Inspite of large heattransfer coefficients in boilingliquids - fins are usedadvantageously when theentire surface is exposed to
6. Inside and outsidediameters of a thin tube are tobe measured. Only one of thefollowing tool is to be selected.Which one would you choose
7. An optical gauge workson the principle of
8. Inspite of large heattransfer coefficients in boilingliquids - fins are usedadvantageously when theentire surface is exposed to
9. 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?
10. The ratio of specific heatsof a gas at constant pressureand at constant volume
11. A hole is specified as0.050 0.000 40 mm. Themating shaft has a clearancefit with minimum clearance of0.01mm. The tolerance on theshaft is 0.04 mm. Themaximum clearance in mmbetween the hole and theshaft is
12. Which of the followingtransducer is preferred formeasurements involvingsound?
13. The principle of materialremoval in Electrochemicalmachining is
14. Equal volume of all gases - at the same temperature andpressure - contain equalnumber of molecules. This isaccording to
15. 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
16. Which of the followingstatements is incorrect?
17. For a typical sample ofambient air (at 35°C - 75%relative humidity andstandard atmosphericpressure) - the amount ofmoisture in kg per kg of dryair will be approximately?
18. 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
19. If the principal strussesand maximum shearingstresses are of equalnumerical values at a point ina stressed body - the state ofstress can be termed as:
20. With reference to airstandard Otto and Dieselcycles - which of the followingstatements are true?
21. 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
22. In the assembly of pulley - key and shaft
23. Equal volume of all gases - at the same temperature andpressure - contain equalnumber of molecules. This isaccording to
24. The maximum allowablecompressive stresscorresponding to lateralbuckling in a discretelylaterally supportedsymmetrical I-beam - does notdepend upon
25. A Carnot refrigerationsystem requires 1.5 kW perton of refrigeration tomaintain a region at -“ 30°C.The COP of system will be

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