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A bus with a capacity of 100 kilobits per second carries 60 kilobits per second of traffic. The bus loading is

  • A.167 per cent
  • B.6 per cent
  • C.60 per cent
  • D.40 per cent

Answer: C

Correct answer: 60 per cent

Bus loading is traffic over capacity:

\[ \frac{60}{100} \times 100 = 60\% \]

The distractor 40 per cent is the margin remaining rather than the loading. Sixty per cent is high for an avionics bus: designers commonly aim nearer 50 to leave room for later functions and to keep worst-case latency comfortably bounded. A bus already at this level constrains what can be added to the aircraft afterwards.

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