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Introduction to battery-management systems- COURSERA WEEK 04 FINAL QUIZ

 Introduction to battery-management systems- COURSERA WEEK 04  FINAL QUIZ 1 . Question 1 W hich of the followi ng detection mechanisms could protect a battery pack from overcurre nt? Select all that apply. 1 point Contactor Thermal fuse Electronic protection Resettable fuse 2 . Question 2 Suppose that a small passenger vehicle expends energy at a rate of 220Wh/mile while driving. If this vehicle's battery pack is charged at a 6.6kW rate, what is the rate of range added to the battery in "miles (of range) per hour"? Round your answer to the nearest "mph". 1 point 3 . Question 3 Suppose that a positive-electrode material has \theta_{0\%}^{\rm pos}=0.99 θ 0 % p o s ​ = 0 . 9 9 and \theta_{100\%}^{\rm pos}=0.49 θ 1 0 0 % p o s ​ = 0 . 4 9 . If \theta_k^{\rm pos}=0.59 θ k p o s ​ = 0 . 5 9 , what is the present cell state-of-charge (in percent)? Round to the nearest percent. 1 point 4 . Question 4 Suppose that a lithium-ion cell having total charge capacity Q=10 Q =...

Introduction to battery-management systems- COURSERA WEEK 03 QUIZ -1.3.7 ANSWERS

 Introduction to battery-management systems- COURSERA WEEK 03 QUIZ -1.3.7 ANSWERS

Practice quiz for lesson 1.3.7

Question 1

Consider a battery having V_b=100V. What is the minimum value of isolation resistance (in k\Omega) for the battery pack to be considered safe?

1 / 1 point
50
Correct

Yes. The minimum isolation resistance must be 500V_b=50,000.

Question 2

Consider a battery having V_b=200V. We measure V_1=50V and V_2=150V. If we insert a known resistance R_0=200k\Omega on the negative-terminal side of the battery, then we measure V_1'=48.3V. If, instead, we insert a known resistance R_0=200k\Omega on the positive-terminal side of the battery, then we measure V_2'=145V.

What is the isolation resistance of this battery pack (in \Omega)? Round your answer to the nearest \Omega.

1 / 1 point
9195
Correct

Yes. The possible isolation fault is on the negative-terminal side since V_1<V_2. We solve for isolation resistance using the equation on slide 5 and arrive at this answer. Since this resistance is less than 500V_b, we determine that there is an isolation fault.

Question 3

Consider a battery having V_b=150V. We measure V_1=80V and V_2=70V. If we insert a known resistance R_0=100k\Omega on the negative-terminal side of the battery, then we measure V_1'=40V. If, instead, we insert a known resistance R_0=100k\Omega on the positive-terminal side of the battery, then we measure V_2'=35V.

What is the isolation resistance of this battery pack (in \Omega)? Round your answer to the nearest \Omega.

1 / 1 point
187500
Correct

Yes. The possible isolation fault is on the positive-terminal side since V_1>V_2. We solve for isolation resistance using the equation on slide 7 and arrive at this answer. Since this resistance is greater than 500V_b, we determine that there is not an isolation fault.

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