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Mechanical Engineering Practice Questions
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Mechanical Engineering Practice Questions
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1. The stroke and bore of afour stroke spark ingitionengine are 250 mm and 200mm respectively. Theclearance volume is 0.001 m3.If the specific heat ratio g =1.4 - the air-standard cycleefficiency of the engine is
2. The degree of perfectionused in instruments themethod and the observations - is known as
3. Rankine cycle efficiencyfor a power plant is 29%. Thecarnot cycle efficiency will be
4. If moment M is appliedat the free end of centileverthen the moment produced atthe fixed end will be
5. In a pipe pitot tubearrangement the staticstagnation head is 20 m andstatic head is 5m. If thediameter of pipe is 400 mm.Find the velocity of flow ofwater in pipe
6. Which thermometer isindependent of the substanceor material used inconstructions?
7. Involute function of agear is defined as
8. In an air standard ottocycle - the pressure in thecylinder at 30% and 70% ofthe compression stroke are1.3 bar and 2.6 barrespectively. Assuming thatcompression follows the lawPV1.3 = constant - what willbe the air standard efficiencyof cycle
9. If a closed system isundergoing an irreversibleprocess - the entropy of thesystem
10. For non sysmetric shapesuitable casting method is
11. A photoelectric device inwhich the resistance of themetal changes - directlyproportional to the lightstriking on it is known as
12. Grating are used inconnection with
13. Which of the following ismaximum capacity bearing?
14. Tool signature comprisedof
15. The static error band ofan instrument does notinclude
16. The manufacturingprocess in which metalchange its state from liquid tosolid.
17. The number of strainreadings (using strain gauges)needed on a plane surface todetermine th principal strainsand their directions is
18. 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
19. 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
20. In electo dischargemachining (EDM) - If thethermal conductivity of tool ishigh and the specific heat ofworkpiece is low - then the toolwear rate and the materialremoval rate are expected tobe - respectively -
21. The flatness of a machinebed can be measured using
22. A process - in which theworking substance neitherreceives nor gives out heat toits surroundings during itsexpansion or contraction - iscalled
23. 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?
24. Hexa methylenetetramine is added to theresin sand as a
25. A ball - falling verticallystrikes a 30° frictionlessinclined plane and reboundshorizontally. The coefficient ofrestitution will be

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