A 200-V, DC motor has an armature resistance of 0.5 Ω. It is drawing an armature current of 20 A driving a certain load. Calculate the induced EMF in the motor under this condition.

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SSC JE Electrical 05 Jun 2024 Shift 3 Official Paper - 1
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  1. 190 V
  2. 199.3 V
  3. 203.7 V
  4. 175.8 V

Answer (Detailed Solution Below)

Option 1 : 190 V
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Detailed Solution

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We have,

V = 200 volts

Ra = 0.5 Ω

Ia = 20 A

From Equation of DC Motor:

V = E + IaRa

200 = E + 20 × 0.5

⇒ E = 200 - 10 = 190 volts

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