Mechanical Engineering Interview Questions

·         What is water hammering?

·         What are the available tests to check pH?

·         What is turbidity and what is the cause for it?

·         Differences between COD and BOD?

·         Differences between reactive silica and colloidal silica and their effects?

·         What happens to the turbine blades when silica is present in the dm water?

·         What is the limit for storing inergen cylinders inside the plant without any PESO approval?

·         What are the limits to consider a pipe line or a tube to be IBR?

·         What is the difference between a tube and pipe?

·         What are the advantages of using Natural Gas over HSD or LSHS?

·         What are the different valves that you encountered till now?

·         During HCl filling in the tank, HCl fumes will generate, what are the means to absorb these fumes?

·         Why PVC balls are used in DM water tank?

·         Which has a higher COP, Vapor compression or vapour absorption?

·         What is flocculation?

·         What are the effects if minerals are present in DM water?

·         What is the function of anthracite in a water treatment plant?

·         What is the effect of free chlorine on resins?

·         What are the different losses in a cooling tower and what is their percentage

·         What is the difference between Furnace oil and LSHS?

·         What is the function of Tatory stripper in Process Plant?

·         What are the checks to be performed before starting a motor?

·         What is the maximum NOx level permitted?

·         What are the factors that affect corrosion?

·         What are the factors that influence scaling?

·         What are the factors that influence fouling?

·         What are the various types of cooling water corrosion?

·         What are the ways and means to control corrosion?

·         Why clearance between impeller and back plate needs to be maintained, what happens if it increases or decreases and how is it measured?

·         What all are the types of level transmitters available?

·         What all are the types of flow transmitters available?

·         Bicarbonates of Ca & Mg are responsible for  _____________ and chlorides, sulphates & Nitrates of Ca & Mg are responsible for  ________________

·         What are the steps to be followed in gun cleaning activity?

·         What are the methods of Boiler preservation and when are they preferred?

·         What is the material used for cold insulation?

·         What are the steps followed in Laser alignment?

·         What is the equation for temperature and pressure compensation for flow calculation?

·         What is the low level alarm set point for Deaerator?

·         What is fuel gas minimum pressure control loop in boiler?

·         What is the minimum capacity of a hydrocarbon tank required for PESO approval?