Chapter 7 batteries (PM test)
What temperature is the cold cranking amp capacity of a lead acid-based on?
0°F
What electrolyte specific gravity measured at 80°F should indicate that a lead acid battery is fully charged?
1.265
When load testing a lead acid battery, which of the following would be the recommended load to be drawn by the carbon pile?
1/2 of the CCA rating for 15 seconds
Which of the following represents the correct mixture of proportion required of the electrolyte in a lead acid battery?
36% Sulfuric acid, 64% distilled water
When load testing a fully charged, lead acid battery at 0°F at 1/2 the rated CCA for 15 seconds, what is the lowest acceptable voltage during the test?
8.5 volts
When low testing a fully charged, let us in battery at 80°F at 1/2 the rated CCA for 15 seconds, what is the lowest acceptable or did you during the test?
9.6 volts
Who invented the first battery?
Alessandro Volta
Which of the following conditions can shorten the life of a heavy duty, wet cell, let acid battery? A. Over charging B. Undercharging C. Deep cycling D. All the above
All the above
Which of the following conditions could result in an undercharged batteries? A. Loose belt B. Defective diode trio C. Residual magnetism in the rotor D. All the above
All the above
Which of the following would be a consequence of reversing the polarity of a battery bank on truck electrical system? A. Battery explosion B. Damage to the truck electronics C. Damage to the alternator D. All the above
All the above
What is the primary method of rating current truck lead acid batteries?
Ampere hour rating
What solution is recommended to neutralize and clean corrosion from battery posts and terminals?
Baking soda and water
When using a midtronics type capacitance tester to evaluate battery performance, which of the following data must be input?
CCA
What is the chemical active matter on the anode plates of wet cell , lead acid batteries?
Calcium
Which of the following methods is the correct approach to cranking a hard to start, truck diesel engine using wet cell batteries?
Crank for 30 seconds, rest for 2 minutes
Which of the following is a advantage of any maintenance free lead acid battery compared with a similarly sized and rated standard battery? A. higher CCA B. Sustains overcharging without failing C. Longer inactivated shelf life D. All the above
D. All the above
Which of the following terms best describes the rapid charge and complete discharge cycling of a battery?
Deep cycling
On current trucks with data bus driven electronics, where is recommended you should place a ground clamp from the battery charger or when boosting?
Directly on the battery ground post
When replacing a battery, which is the recommended sequence to use in disconnecting and reconnecting the cables?
Disconnect the ground cable first and reconnect it last
Which of the following statements about a standard lead acid batteries true when compared with a maintenance free battery? A. Better ability to handle deep cycling B. Lower reserve capacity C. Faster discharge rate D. All the above
Faster discharge rate
When preparing to load test a lead acid battery, the technician first check the integral Hydro meter are and sees that it is dark. What should be done next?
Fully charge the battery before attempting to test it
During a work cell battery charge cycle, what do the water molecules in the electrolyte reduced to?
Hydrogen and oxygen
When there are multiple 12 V batteries in a bank, how much they be connected and a truck with a chassis voltage of 12 V?
In parallel
When using a portable generator to fast charge a set of discharge batteries on a truck, which of the following would be best practice to get the unit started?
Make sure all electrical accessories are turned off
Technician a says that adding pure sulfuric acid to a discharge lead acid battery is recommended means of reducing the time required to charge it. Technician B says that it is acceptable to add tapwater to top the electrolyte in a lead acid battery. who is correct?
Neither A nor B
Technician a says that so faded battery is less likely to freeze an extreme cold temperatures. Technician B says that a sulfated battery often measures an abnormally high voltage across it's terminals immediately after charging. Who is correct?
Neither a or B
Technician a says that it is acceptable to load test a sealed lead acid battery providing the temperature is not below 32°F. Technician B says that BCI recommends that carbon pile testing should be performed by loading the battery at 1/2 of the specified CCA rating. Who is correct?
Neither a or b
What is a common result of deep cycling a lead acid battery?
Plate buckling
Which of the following defines a galvanic device?
Produces voltage by chemical action
What is the main advantage of modern battery conductance test instruments?
Reduces the incidence of misdiagnose batteries
When testing specific gravity of a lead acid battery, which of the following produces a reading that is not influenced by the actual temperature of the electrolyte? A. Built in hydrometer B. Glass bulb hydrometer C. Plastic floated type hydrometer D. Refractometer
Refractometer
If the integral charge indicator in a lead acid battery is clear in color, what should you do?
Replace the battery
Which of the following battery cables would have the largest sectional diameter? A. SAE metric 80mm B. SAE metric 60mm C. SAE 2/0 or 00 D. SAE 1/0 or 0
SAE 1/0 or 0
Technician a says the exclusive vibration can shorten the life of a lead acid battery by shaking the active material from the plates. Technician B says that what cell truck batteries are designed to sustain high levels of vibration and they seldom causes premature failures. Who is correct?
Technician A only
Technician a says that what so battery gassing produces an explosive mixture of hydrogen and oxygen and that great care should be taken anytime a battery is being charged. Technician B says that gassing occurs only during battery discharge cycles on maintenance free batteries. Who is correct?
Technician b
Technician a says that used batteries can disposed of in the garbage providing the electrolyte is remove the first. Technician B says the battery vendors are usually required by law to receive as many batteries for recycling as they sell. Who is correct?
Technician b only
If you suspect that a lead acid battery has frozen, after bringing it to room temperature, what should you do first?
Trickle charge and observe response
Assuming that the electrolyte mixture is correct, which of the following specific gravity readings would indicate that a lead acid battery was completely dead?
1.150
Using the 84 factor method of correlating specific gravity to voltage, what should a SG rating in one cell of 1.250 convert to?
2.090 volts
What is SAE metric battery cable of 100 mm equivalent to?
4/0 or0000
When inspecting a lead acid battery with an integral Hydro meter, you can see the color that is yellow through the sight glass. What does this tell you?
Battery is fully charged
Tech a says that a defective voltage regulator can result in over charging the batteries. Tech b says that when batteries are overcharged, they can boil off electrolyte. Who is correct?
Both A&B
What type of battery is used to where a isolated battery is required
Gelled electrolyte
Which of the following is the battery manufactures recommended method of removing the surface charge from recently charged lead acid battery?
Load at 300 amps for 15 seconds
Which of the following battery type scan best sustain repeated deep cycling?
Maintenance free lead acid
The term used to describe the weight of a volume of a liquid versus the weight of an equal volume of pure water is:
Specific gravity
What is the chemical active matter on the cathode plates of wet cell lead acid batteries?
Sponge lead
What is the role played by a battery described as an isolated battery in a truck electrical system?
Used primarily when engine is off
What is used as an electrolyte in a vehicle lead acid battery?
Water and hydrochloric acid solution