If two ammeters A and B require 20 mA and 30 mA current, respectively, to give a full - scale - deflection, then:

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PGCIL DT Electrical 5 May 2023 Official Paper
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  1. sensitivity cannot be judged with the given information
  2. both are equally sensitive
  3. B is more sensitive
  4. A is more sensitive

Answer (Detailed Solution Below)

Option 4 : A is more sensitive
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Detailed Solution

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Concept:

For meters, the sensitivity 

Ifsd is the full-scale deflection in amps

It is expressed in ohm/volt

Calculation:

For Meter A

Ifsd = 20 mA 

For Meter B

Ifsd = 30 mA 

Hence, Meter A is more sensitive, which implies B is less sensitive than W1.

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