Automotive Batteries Questions and Answers

Answer: A

An undersized battery is worked beyond its design and fails early, and cranking suffers when it is cold. The starter genuinely does draw only what it needs, which makes the second option a true statement leading to a false conclusion. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

Answer: B

Physical fit is the first problem, and a much larger battery may never reach full charge on short journeys. The starter draws what it needs regardless. A modest increase is usually harmless and sometimes beneficial. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

Answer: C

A clamp meter reads the field around a cable, which allows a starter current of hundreds of amps to be measured safely. Volt drop along a cable is a genuine alternative technique used with a known cable, which makes the second option a real method. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

Answer: D

A small petrol engine draws roughly 150 to 200 amps while cranking, and a large diesel considerably more. Five hundred amps is genuinely representative of a big diesel, which makes the last option a correct figure for the wrong engine. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

Answer: A

Excessive current with slow cranking means something is binding, whether within the starter or the engine itself. A poor connection or flat battery gives low current with slow cranking, which is the opposite pattern and equally diagnostic. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

Answer: B

If the current is low and cranking is slow, something is limiting the current: a bad connection, a poor earth or a flat battery. Friction raises current rather than lowering it, which makes the last two options describe the opposite condition. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.