JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV Year ELECTRICAL AND HYBRID VEHICLES Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
(25 Marks)
Give the classification of various electric vehicles.
Answer
Electric vehicles are primarily classified into Battery Electric Vehicles (BEVs), Hybrid Electric Vehicles (HEVs), Plug-in Hybrid Electric Vehicles (PHEVs), and Fuel Cell Electric Vehicles (FCEVs).
What are the standard features of an EV?
Answer
Standard features of an EV include an electric motor for propulsion, a high-voltage battery pack for energy storage, an onboard charger, a power electronics controller (inverter), and a regenerative braking system.
Write the different train topologies used in EVs.
Answer
Sign in to view the complete answer paper.
Give the basic concept of hybrid traction.
Answer
Sign in to view the complete answer paper.
What is a drive train? Give its need in EVs.
Answer
Sign in to view the complete answer paper.
Explain drive system efficiency.
Answer
Sign in to view the complete answer paper.
What is sizing the propulsion motor?
Answer
Sign in to view the complete answer paper.
What are different modes of charging batteries?
Answer
Sign in to view the complete answer paper.
List various energy management strategies.
Answer
Sign in to view the complete answer paper.
What are the major issues in energy management of EHVs?
Answer
Sign in to view the complete answer paper.
PART - B
(50 Marks)
Give the conditions needed for choosing a pure EV when compared with hybrid vehicles including the impact of climate changes?
Answer
Sign in to view the complete answer paper.
Based on power source configuration explain the EV drive train alternatives.
Answer
Sign in to view the complete answer paper.
State and explain the dynamic equation of vehicle motion.
Answer
Sign in to view the complete answer paper.
Give different architectures of hybrid electric drive trains and explain the series hybrid electric drive train.
Answer
Sign in to view the complete answer paper.
Explain constant power speed operation mode to an electric motor.
Answer
Sign in to view the complete answer paper.
Discuss about the typical value of Induction Motors used in HVE applications.
Answer
Sign in to view the complete answer paper.
Explain in detail about the controlling of permanent magnet motor drives.
Answer
Sign in to view the complete answer paper.
Discuss the working and control of Switched Reluctance motors.
Answer
Sign in to view the complete answer paper.
Discuss the suitability of DC and AC machines for electric and hybrid electric vehicle applications.
Answer
Sign in to view the complete answer paper.
Write a short note on v/f controlled induction motor drive with in field weakening mode and constant torque mode.
Answer
Sign in to view the complete answer paper.
A 12V battery pack is connected to series RL load with L=110mh. The battery pack has rated capacity of 120Ah. At t=0 switch is closed and the battery begins to discharge. Calculate and plot the battery discharge current i(t), if the steady state discharge is C/5. Neglect voltage drop, also calculate the SoC assuming that t=0, the battery is charged to rated capacity. Calculate the time according to 70% DoD, assume t>>100ms.
Answer
Sign in to view the complete answer paper.
Explain the working principle of a fuel-cell and its analysis.
Answer
Sign in to view the complete answer paper.
What is the need for gear system in ICE? Explain with relevant characteristic curves.
Answer
Sign in to view the complete answer paper.
Elaborate energy management system and issues of energy management strategies of EHV.
Answer
Sign in to view the complete answer paper.
Explain the procedure for design of a Hybrid Electric Vehicle (HEV).
Answer
Sign in to view the complete answer paper.