Question No. 1 Which heating value is indicated by a calorimeter and why? Answer: Gross heating value because steam is condensed and heat of vapour formed is recovered. Question No. 2 When does Emergency Seal Oil Pump automatically start? Answer: When its pressure switch senses Main Seal Oil Pump discharge pressure reduced to 78 PSI….
Question No. 1 What is operating pressure? Answer: The amount of pressure nearest the point of performing work at the output end of a pneumatic system. The system operating pressure is used to specify the capability of valves and actuators. Question No. 2 What is the effect of inter cooling in gas turbines? Answer: It…
Question No. 1 Which furnace burns low ash fusion coal and retains most of the coal ash in the slag? Answer: Cyclone furnace. Question No. 2 How the thickness of thermal boundary layer and thickness of hydrodynamic boundary layer related? Answer: Ratio of their thickness = (Prandtl number) – (1/3). Question No. 3 What is…
Question No. 1 What is a Newtonian fluid? Answer: A Newtonian fluid possesses a linear stress strain relationship curve and it passes through the origin. The fluid properties of a Newtonian fluid do not change when any force acts upon it. Question No. 2 What are the causes of failure of superheater tubes? Answer: Superheater…
Question No. 1 Why manholes in vessels are usually elliptical in shape? Answer: Elliptical shape has minimum area of opening and thus plate is weakened the least. Further it is very convenient to insert and take out the cover plate from elliptical opening. Question No. 2 Which Pump is more Efficient Centrifugal Pump or Reciprocating…
Question No. 1 Why the electric motor of a fan with backward curved blades is never got overloaded under any condition? Answer: The maximum power is consumed at about 70% of maximum flow in case of fan with backward blades. For higher flow, power consumption gets lower. Question No. 2 Why the work per kg…
Question No. 1 What is the difference between streamline body and bluff body? Answer: In streamline body the shape is such that separation in flow occurs past the near most part of the body so that wake formed is small and thus friction drag is much greater than pressure drag. In bluff body the flow…
Question No. 1 What are the uses of Graphite electrode in various fields? Answer: Graphite electrode is used in EDM and in battery cells. It is also used in electric arc furnaces to melt the steel. Question No. 2 Difference between TIG & MIG welding Answer: TIG – Tungsten inert gas welding-non consumable electrode MIG…
Question No. 1 What is the composition of Cast iron Grade 35? Answer: Carbon=2.90 – 3.10%, Manganese=0.60 – 1.00%, Silicon=1.50 – 1.90%, Sulphur=0.10%, Phosphorus=0.15%, Chromium=0.30%, Molybdenum=0.30%, Cupper=0.25% Question No. 2 What are the super alloys? Answer: Super alloys are an alloy that exhibits excellent mechanical strength and creep resistance at high temperatures, having good surface…
Question No. 1 What is the difference between Shear and Tensile strength? Answer: Tensile Strength for a Bolt is determined by applying a Force along it long axis. Shear Strength for a Bolt is determined by applying a Force across its diameter, as it would be loaded in a lug joint. Tensile strength is strength…