Why Hydrogen is used in generator cooling? What happens when we fire the boiler with 100% oxygen? What are the consequences when scales are deposited in water wall tubes? Write down the combustion products in a boiler? I. Why sodium tri-phosphate is added in boiler water? II. What is the function of barring gear? III. What is the function of soot blower? IV. How to control NOX emission from the furnace? V. Why regenerative feed water heating is used in Thermal power plant? VI. What are the various fans that are used in Super Thermal Power Plant? VII. Name the types of turbine governing? VIII. Why vacuum pump is used in condenser? IX. Upon what parameters do condenser vacuum depends? X. Difference between Wet and Dry Bottom furnace? XI. How hot reheat line temperature is maintained? XII. What are the types of Circuit Breakers? XIII. Why 20% excess air is used in combustion in the furnace? XIV. Why Convective-Radiative zone superheater is used as the final superheater? XV. Why CBD (Continuous Blow down) is done in boiler drum? XVI. What are the functions of isolator? XVII. What type of cycle is Rankine cycle and why is it called Modified Rankine cycle? XVIII. What types of blades are used in steam turbines? Why? XIX. Functions of NH3 dozing? XX. How axial thrust is balanced in HP turbine? Why double flow steam turbines are preferred? XXI. Various voltage levels in super thermal plant? XXII. Why orifice is used as a starting point of water wall tube panels? XXIII. What are the uses of DG & DC battery banks? 1. For the given equation 2x+y=40; how many sets of (x, y) are possible for x, y >0 and x? y. Ans:13 2. For a given equilateral triangle of side 3 units. What is the length of the perpendicular? 3. A father sees that his shadow and his sons shadow met at a point in the ground when they were standing in a line before a lamp-post. If the length of the post, father and boy were 1.8 meters, 1.2 meters and .9 meters respectively. The distance between the lamp-post and the father is 5 meters. How far is the boy standing away from the lamp-post? 4. Two poles of 3 meter and 4 meter respectively are fixed 5 meters apart. Find the height of the point of intersection of the lines joining the top of each pole to the others ground point from the ground. 5. 3 given straight line equations were given and a point (a, a2) were given. Calculate the range of ‘a’ for which it will lie within the boundary enclosed by the three straight lines? 6. Ten years ago the sum of 8 members in a family is 231. 3 years after a member who aged 60 years died and at the same day a baby was born. Again after 3 years another member who aged 60 years died and again a new baby was born. What is the average age of the family at present? Ans: 24 years
