Question 1

While a li-ion battery is being discharged, which of the following is true?

Accepted Answer

A)  lithium ions move from the cathode to the anode 
B)  lithium ions move from the anode to the cathode 
C)  lithium ions are discharged into the ground circuit 
D)  a thermal runaway is likely 
A)  lithium ions move from the cathode to the anode 
B)  lithium ions move from the anode to the cathode 
C)  lithium ions are discharged into the ground circuit 
D)  a thermal runaway is likely

Question 2

Which of the following best describes the category of batteries that tends to be used in most current commercial electric vehicle powertrains?

Accepted Answer

A)  Alkaline 
B)  Lead acid 
C)  Lithium-ion (Li-on) 
D)  Nickel cadmium (Ni-cad) 
A)  Alkaline 
B)  Lead acid 
C)  Lithium-ion (Li-on) 
D)  Nickel cadmium (Ni-cad)

Question 3

What is the function of a typical battery disconnect unit (BDU)?

Accepted Answer

A)  power distribution 
B)  communications with chassis data bus 
C)  current sensing 
D)  all of the above 
A)  power distribution 
B)  communications with chassis data bus 
C)  current sensing 
D)  all of the above

Question 4

Technician A says that some CEVs use 6-phase AC traction motors. Technician B says that some CEVs use 9-phase AC traction motors Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 5

How many NMC strings would have to be placed in series to produce a bank voltage that exceeds 600 VDC?

Accepted Answer

A)  Seven 
B)  Five 
C)  Four 
D)  Three 
A)  Seven 
B)  Five 
C)  Four 
D)  Three

Question 6

Technician A says that UCs can store large amounts of electrical energy but discharge it more slowly than most types of batteries. Technician B says that some UCs will sustain up to a million charge and discharge cycles. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Exam 41: Electric Powertrains

While a li-ion battery is being discharged, which of the following is true?

Which of the following best describes the category of batteries that tends to be used in most current commercial electric vehicle powertrains?

What is the function of a typical battery disconnect unit (BDU)?

Technician A says that some CEVs use 6-phase AC traction motors. Technician B says that some CEVs use 9-phase AC traction motors Who is correct?

How many NMC strings would have to be placed in series to produce a bank voltage that exceeds 600 VDC?

Technician A says that UCs can store large amounts of electrical energy but discharge it more slowly than most types of batteries. Technician B says that some UCs will sustain up to a million charge and discharge cycles. Who is correct?

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