Question

question 12 (1 point)
which dangerous chemicals do we need to be aware of when working with a lead - acid battery. choose all that apply.
a nickel
b hydrogen
c sulphur
d lead
e lithium
question 13 (1 point)
taking a conductor and making it into a coil lessens and weakens the magnetic field of the conductor.
true
false
question 14 (1 point)
an alternator is putting out 13.8 volts, this would likely indicate that the voltage regulator is working correctly.
true
false
question 15 (1 point)
select the answer that describes the operation of the alternator.
a the alternator is turned via the starter. it creates a/c voltage and rectifies it into d/c voltage.
b the alternator takes the power from the battery and turns the engine over to initiate the starting sequence.
c the alternator is turned via a belt by the crankshaft. it creates a/c voltage and rectifies it into d/c voltage while the engine is running
d the alternator is turned via a belt by the crankshaft. it creates d/c voltage and rectifies it into a/c voltage while the engine is running

Explanation:

• Question 12: Lead - acid batteries contain lead (from the lead plates) and can produce hydrogen gas (during charging, due to electrolysis of water in the electrolyte). Nickel is in nickel - based batteries, sulfur is not a major dangerous chemical in lead - acid batteries in the context of typical hazards, and lithium is in lithium - ion batteries.
• Question 13: When a conductor is made into a coil (solenoid), the magnetic field is strengthened. The formula for the magnetic field inside a solenoid \(B=\mu_0nI\) (where \(n\) is the number of turns per unit length and \(I\) is the current) shows that multiple loops (coil) enhance the magnetic field.
• Question 14: A properly working voltage regulator in a vehicle's charging system (with a lead - acid battery) typically keeps the alternator output in the range of 13.5 - 14.5 volts. So, 13.8 volts is within the normal range.
• Question 15: The alternator is driven by a belt connected to the crankshaft (not the starter). It generates AC voltage (due to electromagnetic induction in a rotating magnetic field - coil arrangement) and then rectifies it to DC voltage (using diodes) while the engine is running.

Answer:

• Question 12: B. Hydrogen, D. Lead
• Question 13: False
• Question 14: True
• Question 15: C. The alternator is turned via a belt by the crankshaft, it creates A/C voltage and rectifies it into D/C voltage while the engine is running