Day 49 of 365 · Beginner · Month 2: Order and data network

Review week 7: hysteresis

Eleven questions on the seventh week: hysteresis for heating and cooling, dead band and interlock, traffic-light colours, klaxon and acknowledging.

Review 12 min Week 7

What you learn today

This week made your controllers calm: no flicker, no fighting, clear signals. The quiz checks:

Hysteresis: two limits and a memory. Heating with slt, cooling with sgt, the and checks the off limit, the or the on limit.
Dead band: heating and cooling band with a gap, all limits computed from one target before the loop, plus an interlock.
Traffic light: select cascade from the most harmless to the worst case. Color exists on displays and on the LED, lamps get their colour from the spray can.
Alarms: klaxon with SoundAlert and Sound. names, warning light, acknowledging with a button and a memory register.

You pass from 60 %.

Tip

For hysteresis questions a small table helps: temperature in one column, state before and after in the next two.

11 questions. You pass from 60 % – the server does the grading.

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