Starting Systems Questions and Answers

Answer: C

A belt driven machine on the accessory drive both cranks the engine and generates, usually at forty eight volts. Crankshaft mounted integrated machines genuinely exist and are the other main architecture, which makes the last option a real alternative. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

Answer: D

Restarts are almost imperceptible and braking energy is recovered into the battery. Belt grip limits the cold cranking torque, so a conventional starter is often retained for the coldest starts. The twelve volt battery remains. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

Answer: A

A cold engine needs more torque than a belt can transmit, so many vehicles keep a conventional starter for the first start of the day. The machine generates throughout its speed range. Belt tensioning is critical to the design. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

Answer: B

The tight and slack sides swap between motoring and generating, so a tensioner is needed on each span. A single tensioner would allow slip in one mode. It is one of the distinctive features of the installation. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

Answer: C

If the small terminal sees battery voltage during cranking, the switch, relay and inhibitors have all done their job. The main terminal is live permanently, which makes the last option a correct statement that proves nothing. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

Answer: D

The control circuit runs through the switch, the relay, the inhibitor and the immobiliser, and any one of them can break it. A poor earth genuinely can prevent the solenoid operating, which makes the last option a real part of that circuit. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

Answer: A

An immobiliser checks a transponder in the key and blocks fuel, ignition or cranking until it is satisfied. Alarms genuinely include immobilisation on many systems, which makes the second option partly true. A steering lock is mechanical. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

Answer: B

Most immobilisers disable fuel and ignition, so the engine turns but will not run, and the security lamp flashes. Starting and stalling after a couple of seconds is a genuine symptom on some systems, which makes the last option real. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The order in which the effects act is what decides the outcome, so it is worth establishing first. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

Answer: C

Voltage drop tests on both sides and a check for solenoid feed take a few minutes and prevent an unnecessary replacement. A bench test is genuinely conclusive, which makes the last option a valid step that follows rather than replaces the circuit checks. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

Answer: D

Field and armature currents are identical in a series machine, so torque rises with the square of current and peaks at stall. That is exactly the characteristic needed to break an engine away from rest, so the reason explains the choice. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.