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Figure below shows an automobile alarm circuit used to detect certain undesirable conditions. The three switches are used to indicate the status of the door by the driver’s seat, the ignition and the head lights, respectively.

What is the output of the above logic circuit with these three switches (D, I and L) as inputs so that the alarm will be activated whenever either of the following condition exists:
The headlights are ON while the ignition is OFF.
The door is open while the ignition is ON.
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Figure below shows an automobile alarm circuit used to detect certain ...
Let us consider D for door, I for ignition and L for light. Then, conditions to activate the alarm are:
(i) The headlights are ON while the ignition is OFF
i.e. L = 1, I = 0 and D may be anything.
(ii) The door is open while the ignition is ON. i.e. D = 1 , I = 1, L may be anything.
Also, alarm will sound if logic circuit output is zero.
Therefore, output (V) for above condition is zero and for rest of the condition it is 1 which is shown in following truth table.

K-map for above truth table is shown below.

Thus, the output of the given logic circuit is
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Figure below shows an automobile alarm circuit used to detect certain undesirable conditions. The three switches are used to indicate the status of the door by the driver’s seat, the ignition and the head lights, respectively.What is the output of the above logic circuit with these three switches (D, I and L) as inputs so that the alarm will be activated whenever either of the following condition exists:The headlights are ON while the ignition is OFF.The door is open while the ignition is ON.a)b)c)d)Correct answer is option 'B'. Can you explain this answer?
Question Description
Figure below shows an automobile alarm circuit used to detect certain undesirable conditions. The three switches are used to indicate the status of the door by the driver’s seat, the ignition and the head lights, respectively.What is the output of the above logic circuit with these three switches (D, I and L) as inputs so that the alarm will be activated whenever either of the following condition exists:The headlights are ON while the ignition is OFF.The door is open while the ignition is ON.a)b)c)d)Correct answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Figure below shows an automobile alarm circuit used to detect certain undesirable conditions. The three switches are used to indicate the status of the door by the driver’s seat, the ignition and the head lights, respectively.What is the output of the above logic circuit with these three switches (D, I and L) as inputs so that the alarm will be activated whenever either of the following condition exists:The headlights are ON while the ignition is OFF.The door is open while the ignition is ON.a)b)c)d)Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Figure below shows an automobile alarm circuit used to detect certain undesirable conditions. The three switches are used to indicate the status of the door by the driver’s seat, the ignition and the head lights, respectively.What is the output of the above logic circuit with these three switches (D, I and L) as inputs so that the alarm will be activated whenever either of the following condition exists:The headlights are ON while the ignition is OFF.The door is open while the ignition is ON.a)b)c)d)Correct answer is option 'B'. Can you explain this answer?.
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