CH.12 ASE

1.Technician A says that the demand for advanced battery technology in commercial vehicles is growing. Technician B says that, not only do the increasingly popular hybrid electric vehicles require advanced batteries, heavy-duty commercial vehicles also have a greater need for electrical storage capacity to run accessories. Who is correct?

2.Technician A says that nickel-metal hydride (NiMH) is one type of battery used in commercial vehicles. Technician B says that lithium and lead acid batteries are also used in commercial vehicles. Who is correct?

3.Technician A says that Li-ion cells maintain a constant voltage for over 90% of their discharge curve as compared to conventional lead-acid batteries maintaining voltage until only 60% discharged. Technician B says that once charged, Li-ion batteries self-discharge at very low rate. Who is correct?

4.Technician A says that one disadvantage of current Li-ion battery technology is cost. Technician B says that Li-ion batteries cost four times more than conventional lead-acid batteries for each kilowatt of power produced per hour. Who is correct?

5.Technician A says that a VRLA battery has the highest cranking amps-even at low temperature. Technician B says that a VRLA battery has triple the life of traditional lead-acid batteries. Who is correct?

6.Technician A says that no vents are used on AGM batteries. Technician B says that AGM batteries will be damaged if charged at greater than 13.2 volts. Who is correct?

7.Technician A says that a smart charger is a battery charger in which microprocessors control charging rates and times. Technician B says that AGM state of charge can be tested with a battery hydrometer. Who is correct?

8.Technician A says that ultra capacitors supplement increases to starter torque and speed. Technician B says that ultra capacitors are currently used to assist batteries for the first 3.5 seconds during cranking, during which time they can supply an additional 1,000 amps of current to supplement the starter batteries. Who is correct?

9.Technician A says that battery management systems (BMS) are designed to protect the cells or the battery from damage. Technician B says that battery management systems (BMS) are designed to prolong the life of the battery. Who is correct?

10.Technician A says that battery balancers attempt to adjust battery voltage to compensate for unequal charges in multiple batteries. Technician B says that equalizers are found in many commercial applications using 24-volt charging systems, including transit and tour buses, private coaches, and off-highway equipment. Who is correct?