Safety and Comfort Electronics Questions and Answers

Answer: A

An airbag inflates within about thirty milliseconds of the impact being recognised. The last option adds the pretensioner, which fires at the same moment, making it a correct and fuller version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

Answer: B

A gas generator drives a piston or rotates the reel, pulling the belt tight before the occupant moves. The last option describes exactly that, which makes it a correct and more detailed version. The inertia reel locks but removes no slack. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

Answer: C

A torsion bar twists above a set load so the belt gives progressively rather than breaking ribs. The last option describes exactly that mechanism, which makes it a correct and more detailed version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. 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: D

A central accelerometer plus satellite sensors decide whether the impact warrants deployment. The last option describes exactly that arrangement, which makes it a correct and more detailed version. Pressure sensors genuinely are used for side impact. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

Answer: A

Crushing the door raises the pressure in the sealed cavity almost instantly. The last option explains exactly why it is faster than acceleration sensing, which makes it a correct and more instructive version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

Answer: B

A side airbag has perhaps five milliseconds where a frontal bag has thirty. The last option explains exactly that constraint, which makes it a correct and more concrete version of the same answer. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

Answer: C

A squib is a bridge wire that heats and ignites the gas generating charge. The last option describes exactly that device, which makes it a correct and more detailed version of the same answer. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

Answer: D

A few milliamps through the bridge wire is enough to fire it. The last option explains exactly that mechanism, which makes it a correct and more instructive version. Only approved equipment is used. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

Answer: A

A capacitor keeps the system able to fire for a minute or more after isolation. The last option describes exactly that, which makes it a correct and more precise version. The period varies by manufacturer. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

Answer: B

Face down, an accidental deployment launches the module across the workshop. The last option explains exactly why face up is correct, which makes it a correct and more instructive version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.