Question No. 1 What are two essential conditions of perfect gas? Answer: It satisfies equation of state and its specific heats are constant. Question No. 2 Enthalpy and entropy are functions of one single parameter. Which is that? Answer: Temperature. Question No. 3 What is DTSI Technology? Answer: DTSI stands for Digital Twin Spark Plug…
Question No. 1 State all the laws of Thermodynamics? Answer: Generally thermodynamics contains four laws; (A) Zeroth law: deals with thermal equilibrium and establishes a concept of temperature. (B) First law: throws light on concept of internal energy. (C) Second law: indicates the limit of converting heat into work and introduces the principle of increase of entropy. (D) Third law: defines the absolute…
Question No. 1 In which part of the steam turbine does stress corrosion cracking (SCC) occur? Answer: In the wet stages of the low-pressure turbine. Question No. 2 In which zone of steam turbines has temperature-creep rupture been observed? Answer: Damage due to creep is encountered in high temperature (exceeding 455°C) zones. That is, it…
Question No. 1 How is a fly-ball governor used with a hydraulic control? Answer: As the turbine speeds up, the weights are moved outward by centrifugal force, causing linkage to open a pilot valve that admits and releases oil on either side of a piston or on one side of a spring-loaded piston. The movement…
Question No. 1 Why an increase in area is required to produce an increase of velocity in case of supersonic flow? Answer: Increase in area for increase in velocity for supersonic flow is required because the density decreases faster than velocity increases at supersonic speeds and to maintain continuity of mass, area must increase. Question…
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…