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| SYSTEMS PREPARATION QUESTIONS 2007 - 16 |
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| V. Ryan © 2007-2017 |
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| The drawing shows one of the passenger doors to a
train. The passenger doors will only open when the train is stationary at
the platform. A sensor circuit controls the opening and closing of doors
which open automatically when a passenger approaches. |
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| 1. Name a suitable sensor for this procedure. |
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| 2. The incomplete circuit for the operation of
the doors is seen below. Complete the circuit by adding the components
required to represent your sensor. |
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| ANSWERS |
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| Name of suitable sensor: LIGHT DEPENDENT RESISTOR |
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| Completed circuit: |
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| 3. Describe on safety feature the door control system
should have. |
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| ANSWER |
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| As the doors close it is possible that a passenger
could be trapped. A pressure sensor could be added to each door so that if
the door closed on a passenger a circuit would detect this and open the
doors immediately. |
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