05 Marks (c) Sketch and explain Lancashire Boiler.
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1 Model question paper No.1 1. Answer any FIVE full questions choosing at least two questions from part A & two questions from part B 2. Use of steam tables is permitted 1. (a) Discuss briefly the different sources of energy. (b) Steam at 10 bar and dryness 0.98 receives 140 kj/kg at the same pressure. What is the final state of the steam? (c) Sketch and explain Lancashire Boiler. 2. (a) What is a Steam turbine? Explain the principle of operation of Impulse turbine? (b) Explain the working principle of closed cycle gas turbine. (c) Sketch and briefly explain Francis turbine. 3. (a) Explain with neat sketches and p-v diagram, the working principle of 4-Stroke petrol engine. (b) A 4-Stroke petrol engine of 100mm bore and 150mm stroke consumes 1kg of fuel per hour. The mean effective pressure is 7 bar and it s indicated thermal efficiency is 30%. The calorific value of the fuel is kj/kg. Find the crankshaft speed. 4. (a) What is Refrigeration? List the properties of an ideal Refrigerant. (b) Explain the principle and working of Vapour Compression Refrigeration with a neat sketch. (c) Define Air conditioning and explain the principle of Air conditioning. 5. (a) Explain the principle of working of Centre Lathe and show the major parts of the Lathe with a neat sketch. (b) Sketch and explain Radial drilling machine. 6. (a) List the types of Milling machines. Explain the principle and working of Horizontal milling machine. (b) Write the specifications of Universal milling machine. (c) Sketch and explain Centreless Grinding. 7. (a) Explain the differences between Soldering, Brazing and Welding methods. (b) What are the mechanical properties of a Lubricant? Explain. (c) Sketch and explain Splash Lubricator. 8. (a) How are belt drives classified? Explain any two types in detail. (b) Derive an expression for the length of the belt in an open drive system. (c) Two gear wheels having 80 teeth and 30 teeth mesh with each other. If the smaller gear wheel runs at 480 rpm. Find the speed of the larger wheel.
2 Model question paper No.2 PART A a) Discuss the advantages of Non-conventional energy sources over conventional energy sources.. b) Find the enthalpy of 1 kg of steam at 12 bar, when steam is 1) dry saturated 2) 22% wet 3) superheated to 250 C. Assume specific heat of the superheated steam as 2.25KJ/Kg K c) Explain with a neat sketch the construction and working of Babcock and Wilcox boiler a) Sketch and explain the working of reaction steam turbine with the help of pressure and velocity profile diagram b) Explain with the working of closed cycle gas turbine with a suitable schematic diagram. c) How are water turbines classified? Explain with sketch the working of Kaplan turbine a) Classify IC engines b) Differentiate between four stroke and two stroke IC engines c) Explain the construction and working of a four stroke petrol engine a) Explain with a neat sketch the working of vapour compression refrigerator b) ) With a neat sketch explain the working of a typical room air conditioner PART B a) With a schematic diagram show how a centre lathe is specified b) With a suitable sketch explain taper turning operation by swiveling of compound rest method c) How are counter sinking and counter boring operation done on a drilling machine? Explain with suitable sketches a) Explain the principle of milling b) Draw a schematic sketch of horizontal milling machine and label its parts. c) With suitable sketches explain the operation of surface grinding a) Distinguish between soldering, brazing and welding b) Describe drop feed lubricator with suitable sketch c) How bearings are classified? Sketch and explain Bushed bearing a) Derive an expression for the length of belt for crossed belt drive b) What is stepped pulley? Indicate its use c) Distinguish between (1) Simple and compound gear train (2) Velocity ratio and gear ratio 10 marks
3 Model question paper No.3 1. (a) Explain any two non-convention sources of energy (b) Explain briefly the different states of steam with the help of diagram (c) Explain with a neat sketch Lancashire boiler. 2. (a) How the steam turbines are classified? Write the differences between them. (b) Explain with sketch the closed cycle gas turbine (c) Write the important points in the selection of water turbines. Explain the working of impulse turbine. 3. (a) Name the thermodynamic cycle of diesel engine. Draw the PV diagram of the same indicating various process (b) Explain with sketch four stroke diesel engine (c) Given the following details of 4 stroke of diesel engine, find the indicated power, brake power, friction power. Bore diameter is 200mm, stroke 300mm. mean effective pressure 0.3 MPa, brake drum dia 1.2m, net brake load 300 N, speed 400rpm. 4. (a) What is a refrigerant? What are the properties of a refrigerant? Name commonly used refrigerants. (b) Define the following 1) ton of refrigeration, 2) COP, 3) Relative COP (c) with sketch explain the working principle of vapour compression refrigeration system 5. (a) How a lathe is specified? Write the line diagram indicating the major parts of a lathe. (b) Explain with sketch the taper turning by swiveling the compound rest ( c) Explain any five operations on drilling machine 6. (a) Write the principle of milling machine. How a universal milling machine is specified (b) Explain end milling and slot milling (c) Write a note on 1) Abrasives & 2) Centerless grinding 7. (a) Explain with sketch the Arc welding process (b) Write flame characteristics of oxy-acetylene welding (c) Write a short note on properties of lubricant and antifriction bearings 8. (a) What is the function of stepped cone pulley? Explain with simple sketch (b) Two pulleys of 50cm and 25cm are to be coupled by a belt drive, if the distance between their axis is 1.5m, find the length of the belt for open and crossed belt drives. (c) Write the different types of gears and gear trains with their applications.
4 Model question paper No.4 1. (a) Explain briefly ocean thermal energy conversion (b) With a neat sketch explain the working of Babcock and Wilcox boiler (c) Find the enthalpy of heat in one kg of steam at 0.9bar and 85% quality 2. (a) With a neat sketch explain the working of a open cycle gas turbine (b) Write a short note (1) Pelton wheel (2) Reaction turbines 3. (a) Explain the working of a 4-stroke petrol engine (b) A 4-stroke I C engine has a piston dia of 150mm & the average piston speed is 3.5 m/sec, if the m.e.p is mpa, find the Indicated power 4. (a) Explain the principle of working of a room air conditioner (b) Write a short on (1) properties of refrigerants (2) refrigerant 5. (a) Sketch and label the parts of a lathe. (b) Explain the working of radial drilling machine 6. (a) With a neat sketch explain the working of a centerless grinding operation (b) Differentiate between (1) Conventional milling & Gang milling (2) End milling and straddle milling 7. (a) Explain soldering. What flux is commonly used? Why the flux is necessary? (b) Differentiate between consumable and non-consumable electrodes (c) How the lubricants are classified? Explain splash lubricator 8. (a) Differentiate between speed cone, fast and loose pulleys. (b) Write a short note on (1) gear tooth profile (2) bevel gears (3) Gear trains 15 Marks
5 Model question paper No.5 1. (a) Classify different sources of energy and give examples. (b) With a neat sketch explain the working of Lancashire boiler (c) Find the enthalpy of 1kg of steam at 12bar, when steam is (1)dry saturated (2) 22% Wet (3) superheated to 250 ºC. assume Cp = 2.25Kj/kg ºK 2. (a) Sketch and explain the working of reaction steam turbine with the help of PV diagram (b) How is water turbines classified? Explain Kaplan turbine. 3. (a).explain the Classification of IC engines (b) Differentiate between four stroke and two stroke IC engines (b) Explain the construction and working principle of four stroke petrol engine 4. (a) Explain with a neat sketch the working of vapour compression refrigeration (b) With a neat sketch explain the working of room air conditioners 5. (a) With the neat sketch explain the construction of a lathe. (b) Give the specifications of a radial drilling machine (c) Explain the following operations 1) Reaming 2) Countersinking 6. (a) Draw a schematic sketch of a horizontal milling machine and briefly explain the function of its main parts. (b) Write the different types of bonding materials (c) Explain With a neat sketch the principle of operation of surface grinding 7. (a) Bring out the difference between soldering, brazing and welding. (b) With a neat sketch explain process of arc welding (c) State the advantages of pedestal bearing over bushed bearing 8. (a) Derive the relation to determine the length of belt in an open belt drive system (b) Explain the slip and creep of belt drive (c) A simple gear train consists of four gears having 40, 50, 60 and 80 teeth in mesh. If the drive is given to 80 teeth gear running at 600rpm, find the speed of the last gear teeth
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