TECHNICAL QUESTIONS MECHANICAL ENGINEERING 1. What is the material of Crank Shaf
ID: 2086605 • Letter: T
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TECHNICAL QUESTIONS MECHANICAL ENGINEERING 1. What is the material of Crank Shaft? 2. Energy stored in the spring when it is fully compressed without any deformation? or proof resilience Ans. Resilience Lower spindle speed in lathe is necessary for? What is the equation governing kinematic links and pairs? Pick out the wrong statement a.Joule cycle consists of 2 constant volume proc b.Otto cycle consists of 2 constant volume processes and 2 adiabatic processes c.Ericsson cycle consists of 2 constant volume processes and 2 adiabatic processes d.None of the above 3. 4. 5. esses and 2 adiabatic processes 6. The angle between face of the tool and plane parallel to the base of the tool is? 7. Bevel gears are used for transmitting torque between? a.Intersecting & coplanar shafts b.Non-intersecting & non-coplanar shafts c.Non-parallel& non-coplanar shafts d.None of the above Expansion process in Otto cycle lasts? a.from TDC to BDC b.30 degrees before TDC ll 50 degrees before BDC c.30 degrees after TDC till 50 degrees after BDC d.none of the above 8. 9. Which type of thread is more effectve for power transmission in one direction? 10. The state of a liquid during evaporation? 11. For same compression ratio which of the following cycles is more efficient? a. square b. acme c. buttress a. vapour b. steam c. water vapour a. otto b. diesel 12. Throttle valve is used in steam engines to a.control pressure of steam b.control volume of steam c.control temperature of steam d.none of the above 13. 24 & 2 in M24X2 represent which of the following two parameters respectively? 14. Unit of Entropy? Ans: J/kg K or kJ/kg K. 15. A mass of 100kg is falling from a height of 1 m and penetrates the sand into for 1 m What is the resistance force given by sand? 16. Ratio of specific heats of air? 17. A body weighs 3 kg in air. If it is submerged in a liquid, t weighs 2.5 kg. What is the specific gravity of the liquid. http://www.mindsover.comExplanation / Answer
1) Crankshaft is made from steel, mostly medium carbon steel alloys are used in manufacturing them. These alloys are composed of iron and also have small % of carbon in it.
3)there are lower speeds because it influences the chip formation and this in turn decides the surface finish of the product. therefore various spindle speeds are available in lathes. The spindle speed must be lowered in some cases according to the method of operation.
5) The first statement is wrong as joule cycle consists of two adiabatic process and two isobaric processes.
6) The angle is called rack angle.
7) Bevel gears are used to transmit torque between intersecting and coplanar shafts.
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