Question
Why is a choke placed between the power supply and the bus line?
Answer
B — To stop the power supply's voltage regulator from correcting (cancelling) the AC information voltage
Source
KNX Basic Course Documentation — 11 — p. 52
All proposed choices (exam context)
- A.To increase the bus voltage from 24 V to 30 V
- B.To stop the power supply's voltage regulator from correcting (cancelling) the AC information voltage✓
- C.To convert the 30 V DC into AC for the devices
- D.To protect the devices against short circuits
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