EDAIC Multiple Choice Questions with simplified explanations. FREE UPLOADS BY WWW.TARGETEDAIC.COM (34)

The section, EDAIC Multiple Choice Questions with simplified explanations, covers a different topic each day with the intent that candidates can prepare one small topic each day, making steady progress in their exam preparation.

Question: Regarding electric damage to body tissues

1. 50 Hz frequency is chosen for mains supply as it is least damaging
2. Currents more than > 1 kHz are most damaging
3. A current of 50mA causes a tingling sensation
4. Current as low as 50 microamperes at 50 Hz can cause ventricular fibrillation
5. The shorter the duration, the lower the current required before damage is done

Answers:

1. false
2. false
3. false
4. true
5. false

Explanation:

• Alternating current at 50 Hz is the most dangerous, it is chosen as it is the most economical frequency. T
• Frequencies > 1 kHz, have dramatically decreased damaging potential. Frequencies in the MHz range are used for their heating properties (diathermy).
• Effects produced by 50 HzAC current
  • 1 mA Tingling sensation
  • 15 mA Muscle tetany, pain and asphyxia
  • 75 mA Ventricular fibrillation
• Direct current through the heart can cause VF at as low as 50-microampere current strength (microshock).
• The shorter the duration of current, the higher the current required before damage is done

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The ‘EDAIC Multiple Choice Questions with simplified explanations’ section covers a different topic each day with the intent that candidates can prepare one small topic each day, making steady progress in their exam preparation.