Utilization Of Electrical Power

Q.1. Classify and explain different types of electric heating. [16]

Q.1. What is welding? Explain various types of electric welding. [16]

Q.2. (a) Discuss the law of illumination and its limitations. [8]

(b) Define following terms - (i) Illumination (ii) Brightness (iii) Mean horizontal candle power (iv) Mean spherical candle power (v) Lamp efficiency (vi) Maintenance factor (vii) Utilization factor (viii) Specific consumption. [8]

Q.2. (a) Give the comparison of Incandescent lamp, Fluorescent lamp, Mercury vapour lamp and Sodium vapour lamp. [10]

(b) What is flood lighting and where it is used? [6]

Q.3. (a) Explain basic principle of electrolysis and discuss its applications. [8]

(b) Explain the following terms used in electrolytic processes - (i) Current efficiency (ii) Energy efficiency (iii) Throwing power (iv) Electro chemical equivalent. [8]

Q.3. Give detailed description of equipments and processes used for various electroplating processes. [16]

Q.4. State the main requirement for an ideal traction system. Classify different traction systems and compare them. [16]

Q.4. (a) Discuss different types of current collection used by traction unit. [8]

(b) Describe substation equipment and layout. [8]

Q.5. (a) An electric locomotive is required to haul a train of 12 coaches each weighing 30 tonnes on the main line service requiring an initial acceleration of 0.8 kmphps up a gradient of 1 in 100. Estimate the adhesive weight and hence the number of driving axles the locomotive must have, if the permissible axle loading is 20 tonnes per axle. Assuming rotational inertia to be 4% for the coaches and 15% for the locomotive. Maximum coefficient of adhesion is 0.2 and the tractive resistance 5 kg/tonne. [8]

(b) What do you understand by speed-time curves? What is its use in practice? Draw the speed-time curves for urban and main line service. [8]

Q.5. (a) Discuss and distinguish between rheostatic and regenerative braking applied in electric traction. Give the advantages of regenerative braking. [8]

(b) Describe series-parallel starting and discuss the advantages of series-parallel starting. [8]