JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV ELECTRIC AND HYBRID VEHICLES Previous Question Paper (July - 2023 - R16)
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
What factors determine the performance of a conventional vehicle?
Answer
The performance of a conventional vehicle is primarily determined by the engine power output, which dictates acceleration and top speed, and the vehicle mass, which influences power-to-weight ratio and inertia. Additionally, performance is governed by aerodynamic drag, rolling resistance, and the transmission efficiency, which collectively determine how effectively engine power is converted into tractive effort at the wheels.
Differentiate EV and HEV.
Answer
An Electric Vehicle (EV) relies exclusively on an electric motor powered by a rechargeable battery pack to provide propulsion. It has no internal combustion engine and produces zero tailpipe emissions, requiring external charging from an electrical grid.
A Hybrid Electric Vehicle (HEV) combines an internal combustion engine with an electric motor and a smaller battery pack. It uses the engine and regenerative braking to charge the battery, meaning it does not need to be plugged into an external power source. The system intelligently switches between or combines both power sources to optimize fuel efficiency.
What is one benefit of using electric power during low load driving conditions in terms of fuel consumption and emissions?
Answer
Sign in to view the complete answer paper.
How does regenerative braking contribute to improved fuel efficiency in hybrid electric vehicles?
Answer
Sign in to view the complete answer paper.
Provide one advantage and one limitation of using induction motor drives in hybrid and electric vehicles.
Answer
Sign in to view the complete answer paper.
What is its typical value for Induction Motors used in HEV applications?
Answer
Sign in to view the complete answer paper.
What are factors affecting the performance of batteries used in EVs?
Answer
Sign in to view the complete answer paper.
Give the advantages and disadvantages of super capacitors as an energy storage device in electric vehicle?
Answer
Sign in to view the complete answer paper.
What is the purpose of energy management strategies in hybrid and electric vehicles?
Answer
Sign in to view the complete answer paper.
List the factors influence the choice of energy management strategy in a vehicle?
Answer
Sign in to view the complete answer paper.
Part B
Explain about the vehicle power source characteristics.
Answer
Sign in to view the complete answer paper.
Explain the mathematical models to describe the vehicle performance.
Answer
Sign in to view the complete answer paper.
Explain about the vehicle transmission characteristics.
Answer
Sign in to view the complete answer paper.
How do vehicle dynamics models contribute to predicting and improving the performance of a conventional vehicle?
Answer
Sign in to view the complete answer paper.
List out the key milestones in the development of electric vehicles since the 19th century?
Answer
Sign in to view the complete answer paper.
Under what condition a pure EV can be chosen as a best option compared to hybrid vehicles considering the impact on climate change?
Answer
Sign in to view the complete answer paper.
How did the introduction of rechargeable batteries and advancements in electric motor technology contribute to the emergence of electric vehicles?
Answer
Sign in to view the complete answer paper.
Explain the various power flow control modes for a series hybrid vehicle?
Answer
Sign in to view the complete answer paper.
With the help of a neat block diagram, explain different subsystems of electric drive train.
Answer
Sign in to view the complete answer paper.
Explain about Traction Motor characteristics in Electric vehicles?
Answer
Sign in to view the complete answer paper.
Explain the impact of modern drive trains on energy supplies?
Answer
Sign in to view the complete answer paper.
Discuss the configuration and control of Switched reluctance motor.
Answer
Sign in to view the complete answer paper.
Explain the terms specific energy and energy density as applied to batteries?
Answer
Sign in to view the complete answer paper.
What superior characteristics of super capacitors make it more suitable for electric vehicle applications?
Answer
Sign in to view the complete answer paper.
How is it possible to use the fly wheel as an energy storage device for electric vehicles?
Answer
Sign in to view the complete answer paper.
How does energy storage contribute to improving the performance and efficiency of hybrid and electric vehicles?
Answer
Sign in to view the complete answer paper.
Classify Energy Management Systems and explain about the Different types of Energy Management Systems?
Answer
Sign in to view the complete answer paper.
List four examples of rule-based strategies that can be applied to energy management in hybrid vehicles.
Answer
Sign in to view the complete answer paper.
Discuss the issues of energy management strategies.
Answer
Sign in to view the complete answer paper.