If meter A requires 100 mA to give full-scale deflection, meter B requires 50 mA to give scale deflection and meter C requires 80 mA to give full-scale deflection, then the

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LPSC (ISRO) Technical Assistant (Electronics): Official Paper 2016 (Held On 07 Aug 2016)
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1. Meter A is more sensitive
2. All meter are equally sensitive
3. Meter B is more sensitive
4. Meter C is more sensitive

Option 3 : Meter B is more sensitive
Free
ST 1: Basic Electrical Engineering
3615
20 Questions 20 Marks 20 Mins

Detailed Solution

Concept:

In ammeters, the sensitivity

$$S = \frac{1}{{{I_{fsd}}}}$$

Ifsd is the full-scale deflection in amps

It is expressed in ohm/volt

Calculation:

For Meter A

Ifsd = 100 mA

$$S_A = \frac{1}{{{I_{fsd}}}}=\frac{1}{100 \ mA}$$

SA = 10

For Meter B

Ifsd = 50 mA

$$S_B = \frac{1}{{{I_{fsd}}}}=\frac{1}{50 \ mA}$$

SB = 20

Hence, Meter B is more sensitive.
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