A logic control system in an automobile generates an audible alarm when any one, two, or three of the following three conditions occur: 1. The ignition is off but the ignition key has not been removed from the switch and a door is opened.
2. The headlamp switch is on with the ignition off and the key removed from the switch.
3. The ignition is on with the engine running but the driver's seatbelt has not been fastened.
Detection circuits generate HIGH inputs to a 3- input logic gate when any of these conditions occurs. The logic gate responds to the high input(s) by generating a HIGH output that triggers the alarm. The 3- input logic gate is most likely a(n):
A) OR gate.
B) NOR gate.
C) Inversion device.
D) AND gate.

Question

A logic control system in an automobile generates an audible alarm when any one, two, or three of the following three conditions occur: 1. The ignition is off but the ignition key has not been removed from the switch and a door is opened.
 2. The headlamp switch is on with the ignition off and the key removed from the switch.
 3. The ignition is on with the engine running but the driver's seatbelt has not been fastened.
 Detection circuits generate HIGH inputs to a 3- input logic gate when any of these conditions occurs. The logic gate responds to the high input(s) by generating a HIGH output that triggers the alarm. The 3- input logic gate is most likely a(n):
A) OR gate.
B) NOR gate.
C) Inversion device.
D) AND gate.

Quizplus · Accepted Answer

The logic gate needed is an OR gate because the alarm needs to go off when any one of the conditions is met, not all at the same time. An OR gate outputs HIGH when any of its inputs are HIGH, matching the requirement for triggering the alarm under any of the specified conditions.

A Logic Control System in an Automobile Generates an Audible