B. Tech Degree II Semester Examination in Polymer Science and
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1 BT PSRT 9 14 PTF 123 MECHANICAL ENGINEERING PART - A (Answer any FIVE questions) 9) (5 x 5 = 25) What are the general classification of engineering materials? Give three examples for each group. What are the functions of boiler mountings and boiler accessories? Give three examples for each group. What is the function of a dynamometer? Give the names of two dynamometers. Why flywheel is used in an engine? What energy is stored in the flywheel. If mass of flywheel is 'm', radius of gyration is 'k' and angular speed is 'w', write the equation of energy stored in the flywheel. Define calorific value of fuel. Differentiate HCV &LCV. Give five properties of moulding sand. Explain any two of them. Name five methods of power transmission. Explain advantages and disadvantages of any two methods. PART - B (Answer any FIVE questions) (5 x 15 = 75).71 Name any six general properties of engineering with two examples each. Define mechanical properties and explain. ( i) Strength (ii) Toughness (iii) Hardness (iv) Ductility What is meant by composite material? Give three examples for composite material. The following are the observations during the test Amount of gas burnt Gas pressure Barometer reading Temperature of gas supplied Amount of water circulated Rise in water temperature Water condensed and collected Determine HCV and LCV of gas at NIP. on Boy's calorimeter. 2 litres 4 cms of water above atmosphere mm of Hg - 2 C Kg C - 2 grams. ( C and 76 mm of Hg). (12) (3) (15) IV. (a) Explain with neat sketch the functions of a simple carburetor. (b) Compare the merits and demerits of four stroke and two stroke engine. (8) (7) Name the different ignition system used in IC engine. Explain with neat sketch working of battery/coil ignition system. Compare petrol engine and diesel engine. (1) (Turn Over)
2 BT - PSRT H PTF 124 ELECTRICAL ENGINEERING AND ELECTRONICS PART A (Answer ANY FIVE questions) (All questions carry EQUAL marks) (5x 5 25) Explain the principle of operation of generating ac voltage. Define, power, power factor, form factor. Derive the relation between line voltage and phase voltage in the case of star connected ac system. Derive the expression for induced voltage in a transformer. Derive the emf equation of dc generator. Explain the starting methods of synchronous motors. Explain the VI characteristics of SCR. PART B (Answer ANY FIVE questions) (5 x 15 = 75) II. (a) Derive the relation between r.m.s value and maximum value of an ac quantity. (8) (b) 25-a-.cil- 1 iti4f Qoo 16 Cot Calculate the voltage drop across each of the components. Draw vector diagram also. (7) What are different losses in a transformer. Derive the condition for maximum efficiency of a transformer. (c) A 1 KVA 2 winding transformer has an iron loss of 1 KW and a cu loss on normal output current of 1.5 KW. Calculate the KVA loading at which the efficiency is maximum and its efficiency at upf load. (Turn Over)
3 Classify the dc generators based on the excitation, (7) A shunt generator delivers 45 A at 23 V and the resistances of the shunt field and armature are 5 Q and.3 Orespectively, Calculate the generated emf. (8) V. (a) What is the significance of back emf in a dc motor? Explain with necessary characteristic curves the reason why a dc series motor is not to be started on no load. List the applications of dc series and compound motors, VI, (a) Explain the principle of operation of three phase induction motors, (b) Cy a single phase induction motor is not self starting? (8) VII. A 2 V dc shunt motor takes 4 A at no load when running at 7 rpm. The field resistance is 1 Q. The resistance of armature at stand still gave a drop of 6 volts across armature terminals when 1 A were passed through it. Calculate (i) speed on load (ii) torque in Nam (iii) efficiency. The normal input of the motor is 8 KW, (15) VIP. (a) Explain the working zener diode voltage regulator. (b) Explain with waveform the working of full wave rectifier with capacitor filter. IX. (a) Explain different types of transistor biasing. (b) Explain the working of transistor as an amplifier. (7) ***
4 BT PSRT II 9 16 PTF 125 MACHINE DRAWING II Draw the elevation and end view of a square headed bolt of size M24. The length of the bolt is 6 mm and thread length is 36 mm. Draw the locking arrangement of an ordinary nut using a lock nut. OR Draw neat-dimensioned sketches of the following types of foundation bolts. Type C foundation bolt for el 24 ii) Rag foundation bolt ( = 3) (2) (1) III Draw the following views of a gib and cotter joint for a rod size 32 x 32 mm. 1) Top half sectional elevation Bottom half sectional plan End view from right OR IV Draw top half sectional elevation and end view of a flanged coupling (protected type) for a shaft size of 3 mm. Use standard proportions. (3) (3) parts of a horizontal type cross head is given in the figure. Assemble them and draw the following views. Elevation right half in section Plan left half in section (4) (Turn over)
5 1. n x3 SNUG HOLE R 2 5 I. 3 Ft R 2 3x 3 sqvg GROO,C Nit\ UMW Mangtargi fl 2x1,41 2 x 24 R 8 Co 12 M I Item Description Qty:. Grooved nut Bolt Bearing - (Rectangular) 1 Bearingq1iatt round) Shoe -117' Set screw. 4 Piston rod end End cap ITEM LIST Material. S; Orass Brass C.I. M.S Steel C.S. Grub Screw 2 M.S.
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