Ignition Systems Questions and Answers

Answer: A

With a fixed crankshaft sensor there is nothing to adjust; the timing is calculated from the map. Software calibration genuinely is possible with the right equipment, which makes the last option real for a tuner rather than a technician. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

Answer: B

High tension leads carry tens of thousands of volts and their insulation must resist tracking. The cap and the plug insulator genuinely perform the same function in their own places, which makes both alternatives true of different components. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

Answer: C

Resistive cores suppress radio interference, and spiral wound inductive cores do the same with lower resistance. Copper cored leads would radiate interference badly. The spiral type is genuinely used, which makes the last option a real construction. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

Answer: D

Each spark is a broadband radio transmitter and would ruin reception and disturb electronics. Resistors in the leads, plugs and rotor all contribute. Legal limits on emissions apply to vehicles. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

Answer: A

A lead is measured end to end and compared with the figure per metre. Insulation testing genuinely reveals tracking and is a real check, which makes the last option a valid additional test rather than a wrong one. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. The shared behaviour explains why these belong together and the differences explain why both exist.

Answer: B

In darkness the leakage is visible as a blue flicker, and a carbon track marks the path. Carbon inside a boot genuinely indicates arcing at the plug connection, which makes the last option a real observation with a slightly different meaning. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

Answer: C

Moisture and carbon follow the crack and the spark jumps to the wrong cylinder or to earth. Segment corrosion genuinely is a separate fault of the same component, which makes the last option a real observation. Misfire under load is typical. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

Answer: D

Moisture bridges the crack and the spark takes the easier path. Heavy load genuinely makes tracking more likely because the plug demands more voltage, which makes the last option a real aggravating factor. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

Answer: A

Heat range describes the path length from the insulator nose to the shell and therefore how hot the tip runs. A plug too hot causes pre-ignition, which makes the last option describe a consequence rather than the definition. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

Answer: B

A tip running too hot becomes a source of ignition before the spark arrives. Fouling is the consequence of too cold a plug, which makes the second option describe the opposite error accurately. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Most errors here come from carrying a result across from a neighbouring case where it does not hold. Framing the question as which quantity the change acts upon makes the answer follow without calculation.