Electronics (Leaving Cert Engineering): Quizzes
📚Quizzes
Practise the questions
13 questions from this quiz
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Practise the questions
13 questions from this quiz
What is the primary function of sensors and switches in engineering systems?
What is the primary function of sensors and switches in engineering systems?
Interface between physical world & electronics
What mechanism do mechanical switches use to operate?
What mechanism do mechanical switches use to operate?
Cam and plunger
In a normally closed (NC) mechanical switch, what happens when the cam trips the plunger?
In a normally closed (NC) mechanical switch, what happens when the cam trips the plunger?
Switch moves from closed to open
Why are normally closed mechanical switches preferred for safety-critical applications?
Why are normally closed mechanical switches preferred for safety-critical applications?
They provide fail-to-safe operation
What is a key disadvantage of mechanical switches?
What is a key disadvantage of mechanical switches?
Limited lifespan due to wear
How do photoelectric sensors detect objects?
How do photoelectric sensors detect objects?
By detecting changes in light intensity
What is an advantage of slotted housing photoelectric sensors?
What is an advantage of slotted housing photoelectric sensors?
No alignment required
How do proximity sensors detect the presence of targets?
How do proximity sensors detect the presence of targets?
By emitting electromagnetic fields
What is the typical maximum sensing distance for proximity sensors?
What is the typical maximum sensing distance for proximity sensors?
50mm or less
What activates the contacts in a reed switch?
What activates the contacts in a reed switch?
Magnetic field application
Why are reed switches suitable for hazardous environments?
Why are reed switches suitable for hazardous environments?
They are intrinsically safe
What is a major advantage of Hall sensors over mechanical switches?
What is a major advantage of Hall sensors over mechanical switches?
Virtually infinite lifetime
What should engineers prioritise first when selecting sensors for an application?
What should engineers prioritise first when selecting sensors for an application?
Reliability requirements