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Flip to reveal answersName the four flow-diagram symbols.
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All 4 Flashcards — Flow diagrams
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Question
Name the four flow-diagram symbols.
Answer
A rounded box for start and stop, a parallelogram for input and output, a rectangle for a process, and a diamond for a decision.
Question
How many outputs may a decision have?
Answer
Exactly two, both labelled YES and NO. Three outcomes need two diamonds in sequence, not three lines out of one.
Question
Why must a control program loop back?
Answer
Otherwise it reads its sensor once and stops, leaving the output in whatever state it was in. The loop is what makes it monitoring.
Question
What is a dead band and how is it drawn?
Answer
A gap between the switch-on and switch-off thresholds, drawn as two decision diamonds with different values — 25 °C to open and 22 °C to close.
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Topic 7.4 hub
Electronic systems applied
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