Question 1                                                                                          (25 marks)

  • What are the advantages and disadvantages of electric traction?
  • Derive the Relationship Between Principal Quantities in Trapezoidal Diagram.
  • A train runs between two stations 1.6 km apart at an average speed of 36 km/h. If the maximum speed is to be limited to 72 km/h, acceleration to 2.7 km/h/s, coasting retardation to 0.18 km/h/s and braking retardation to 3.2 km/h/s, compute the duration of acceleration, coasting and braking periods. Assume a simplified speed/time curve.

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Question 2                                                                                         (25 marks)

  • Compare between series and shunt d.c motors
  • Explain the theory of operation and construction of DC generator
  • Determine developed torque and shaft torque of 220-V, 4-pole series motor with 800 conductors wave-connected supplying a load of 8.2 kW by taking 45 A from the mains. The flux per pole is 25 mWb and its armature circuit resistance is 0.6 Ω.

 

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Question 3                                                                                         (25 marks)

  • Mention Merits and demerits of Coal-fired Thermal Power Stations
  • Explain with the aid of schematic diagram the main components of coal-fired thermal station
  • Explain with the aid of schematic diagram the main components of Nuclear Power Stations
  • Mention Merits and demerits of Nuclear Power Stations

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Question 4                                                                                        (25 marks)

  • Mention the types of batteries? Which type is used in PV systems?
  • What are types of battery charging methods
  • A 48 Volt DC system has AC loads of 6 tube lights 40 watts working for a period of 5 hours, 5 fans 60 watts for 4 hours, freeze 100 watts, water pump 200 watt for 5 hours. Calculate the Average daily energy? If deep cycle batteries are used with DOD 80%, calculate the required battery capacity?