what is the manufacturing process for impellers of closed, semiopen and open type?

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Why the work per kg of air flow in axial flow compressor is less compared to centrifugal compressor for same pressure ratio ?

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Why do we use compressor in pumps for pumping water through borewells? Submersible pump is enough then why do we go for this method?

4 Answers  

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what should be sensor sensitivity of accelerometer in vibration? And what is the main difference between accelerometer and proximity sensors and others?

0 Answers   Reliance,

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Is it possible for something to explode in space like in the movies?

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how much safty of chiller?

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How to calculate the condensate values of boiler?

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What is the material used ball screw rod

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the avg piston speed of an internal combution engine increases as cylinder dimension decreases justify?

0 Answers   L&T,

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Is pipe round because it provides the least area to volume ratio?

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types of stainless steel.why does this called stainless.what is passivation related to SS? What is sensitisation in stainless? Examples of diffrent type of steel e.g. austenatic,martensite,ferritic etc. 304,303,316. How to get rid of carbide formation in SS and stablization in SS.(347 etc.)Different type of heat treatments. Iron carbon diagram. Nelson chart with respect to corosion. Diffrent type of corosion and causes. Carbon equvalent number. Welding related questions.(requirement of post and pre heating in welding). welding of SS. If you have pre experience in maintenance then Material and welding related questions will be there. Then various types equipment in plant (a) static (b) rotatic in pumps and compressor,turbines funda of balance drum and balance disc, balancing line. Impulse wheel, wheel chamber pressure and its effect on turbone health if this increases. Thermal expansion of turbines and with respect to how foundation bolting are designed. Fixing of lower casing before dismantling. Most important shaft alignment and balancing of rotating equipment,classification of static and rotatic equpment used in process plants. Materials for diffrent services as refinery plants fertilizer plants, cement plants, sulphur plants, crude oil with higher sulphur services, then third important thing is codes, standards and recommended practices of diffrent organisation like ASTM,ASME,API,TEMA,BIS,IS,ISO,NPFA,OISD etc. diffrent type of work permit systems fire and safety point of view.

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. how will effect of water injection on turbine load and corresponding MW output(not water washing)

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