Utilization of Electrical Engineering (EX-603 (A)) - Important Questions

State and explain the laws of illumination: inverse square law and Lambert's cosine law.

An illumination of 25 lux is to be produced on the floor of a room 12 m x 9 m. 18 lamps are required to produce this illumination in the room, if 50% of the emitted light falls on the floor and maintenance factor is 0.8 with utilization factor 0.6. Find the candle power of each lamp.

Two lamps are 20 m apart and are fitted with a 50 CP lamp each at a height of 5 m above the ground. Calculate the illumination on the ground (i) under each lamp and (ii) midway between the two lamps.

Explain different methods of energy efficient lighting.

Write down the classification of welding methods based on processes.

Name the different types of electric heating methods and describe in detail any one of them.

Write the advantages of electrical heating. An electric toaster consists of two resistance elements each of 100 ohms. Calculate the power drawn from 250 V AC single phase supply when the elements are connected in (i) series and (ii) parallel.

A golden layer is to be deposited on a piece of metal weighing 50 grams. If 3 Ampere current is flowing and electrochemical equivalent of gold is 0.065, find the weight of gold deposited in 30 minutes.

For a trapezoidal speed-time curve, derive the expression for maximum (crest) speed.

An electric train has an average speed of 42 km/h on a level track between stops 1400 m apart. It is accelerated at 1.7 km/h/s and is braked at 3.3 km/h/s. Draw the speed-time curve and compute its run parameters.

Explain the factors affecting energy consumption / specific energy consumption in propelling the train.

Name the different types of electrical braking and explain regenerative braking in detail.

Explain what do you mean by Individual drive and Group drive? Discuss their relative merits and demerits.

Explain electric vehicle and its components.

Write short notes on any two of the following: (a) Configuration and performance of electric vehicles (b) Transmission requirements for electric vehicles (c) Energy management in hybrid electric vehicles.