Hello Learners, In this Post, you will find **NPTEL Electric Vehicles Assignment 4 Week 4 Answers 2023**. All the Answers are provided below to help the students as a reference don’t straight away look for the solutions.

**NPTEL Electric Vehicles Assignment 4 Answers👇 **

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COURSE NAME | ANSWER |

NPTEL Electric Vehicles Assignment 1 Answers | Click Here |

NPTEL Electric Vehicles Assignment 2 Answers | Click Here |

NPTEL Electric Vehicles Assignment 3 Answers | Click Here |

NPTEL Electric Vehicles Assignment 4 Answers | Click Here |

## NPTEL Electric Vehicles Assignment 4 Answers 2023:

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**For Question 1 to 4 –**

Consider an EV with the following details. Tire rolling friction coefficient = 0.01, Ratio of Gear ratio to the radius of the tyres = 15, acceleration due to gravity = 9.8 m/s2 . Equivalent mass for rotational mass can be taken as 5% of total mass. The wheel is connected to a three phase induction motor with a gear. The maximum torque of the motor is 200 Nm. The maximum percentage grade of the vehicle is 25.

EV starts from rest and operates in constant torque region. Aerodynamic force is neglected. Rated speed of the motor is 5639 rpm.

#### Q.1. Tractive effort is

- 2000N
- 1000N
**3000N**- 1500N

#### Q.2. Mass of EV is

#### Q.3. Acceleration is

**2.2 m/s2**- 1.8 m/s2
- 1.2 m/s2
- 2.6 m/s2

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#### Q.4. Power rating of the motor

**For Questions 5 to10 –**

Consider an EV with the following details. Total mass = 1200 kg, front area = 2 m2, aerodynamic drag coefficient = 0.25 and tire rolling friction coefficient = 0.02, air density = 1.25 kg/m3 , acceleration due to gravity = 10 m/s2 . Equivalent mass for rotational mass can be taken as 6% of total mass. The wheel is connected to a three phase induction motor with a gear. Gear efficiency is 0.9. Induction motor is operating in constant torque region. The vehicle starts from rest and linearly reaches velocity of 80 km/hr in 10 seconds.

#### Q.5.** **Tractive effort at 10 sec is

#### Q.6. Power at the wheels is

- 7144 W
- 64.4 kW
- 6429.6 W
- 71.5 kW

#### Q.7. Power at the motor shaft is

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#### Q.8. Percentage grade of the vehicle is

- 26.2
- 27.8
- 26.36
- 24.77

#### Q.9. Speed of the motor at 3 seconds is

#### Q.10. Tractive effort at 5 seconds is

- 2942.5 N
- 3218.13 N
- 3102.3 N
- 3058.3 N

**NPTEL Electric Vehicles Assignment 4 Answers Join Group👇 **

**Disclaimer**: This answer is provided by us only for discussion purpose if any answer will be getting wrong don’t blame us. If any doubt or suggestions regarding any question kindly comment. The solution is provided by **Brokenprogrammers**. This tutorial is only for Discussion and Learning purpose.

#### About NPTEL Electric Vehicles Course:

This course will be a first level course on electric vehicle. Students will be able tounderstand the operation of battery driven electric vehicle. The course will start withintroduction section which will enable the students to understand the focus areas thatcome under the umbrella of electric vehicles. Then the course will start covering this focusareas one by one such as vehicle dynamics, Motors, Power Electronics, Batteries,Charging etc. The most important part of this course will be that each topic will beanalyzed and demonstrated through Matlab Simulink, so that the grip of the subject willbe strong and the knowledge acquired will be useable in real time applications.

##### Course Layout:

**Week 1**: Introduction to Electric Vehicle**Week 2**: Vehicle Dynamics: Modelling and Simulation**Week 3**: Fundamental of Drives and DC Machine Modeling**Week 4**: DC Machine Drives and Control of EV Using DC Machine

**CRITERIA TO GET A CERTIFICATE**:

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.

Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

**YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.**

If you have not registered for exam kindly register Through https://examform.nptel.ac.in/