Engineering B.E. (Electrical Engineering) Sem 8 May 2019 2019 Electric And Hybrid Electric Vehicle Technology Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 Question No. 1 is compulsory
2. Q2 Solve any three questions out of remaining five questions
3. Q3 Assume suitable additional data if necessary
4. Q4 Figure on right indicates full marks
5. Q1 a. Explain historical background of EV and HEV technology involvement 5 marks
   • b. State and explain the dynamic equation of vehicle motion 5
   • c. Derive closed loop transfer function of current controlled PI controller 5
   • d. Comment on the suitability of DC and AC machines for electric and 5
6. Q2 a. battery pack is connected to series RL load with L=100mH.The battery pack has rated capacity of 120Ah. At t=0 switch is closed and the battery begins to discharge 10 marks
   • a) Calculate and plot battery discharge current i(t), if the steady state discharge is C/5.Neglect voltage drop
   • b) Calculate and plot SoC, assuming that t=0, the battery is charged to rated capacity
   • c) Calculate the time according to 70% DoD, assume t>>100ms
   • b. and explain the ideal traction power plant characteristic and 10 power source characteristics used in electric and hybrid
7. Q3 a. Enlist the different architectures of hybrid electric drive train and explain the series hybrid electric drive train 10 marks
   • b. Describe in detail all modes of operation for series-parallel hybrid 10
8. Q4 a. Explain the two-quadrant operation of chopper DC motor drive with suitable waveforms for electric vehicle 10 marks
   • b. Adc separately excited motor is powered by a dc to dc converter from. 10 a 600 volts dc source. The armature resistance is 0.05 Q. The back emf constant of the motor is 1.527 V/A rad/sec. The average armature current is 250 amps. The field current is 2.5 amps. The armature current is continuous and has negligible ripple. If the duty cycle of the converter is 60%, determine (a) the input power from the source, (b) the equivalent input resistance of the dc-dc converter drive, (c) the motor speed, and (d) the developed torque
9. Q5 a. What are different modes of charging batteries? Compare them in 10 marks
   • b. Explain fuel cell and flywheel as energy source elements in 10
10. Q6 a. Draw and explain the typical CAN system of a hybrid electric vehicle. 10 marks
    • b. Classify and explain the basic principle of Rule based energy 10 management system. Elaborate on any one of the Rule based energy

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