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A 220 V DC motor has an armature resistance of 0.8 Ω. Find the induced emf when the motor has a full load armature current of 40 A.
- a)180V
- b)32V
- c)188V
- d)150V
Correct answer is option 'C'. Can you explain this answer?
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A 220 V DC motor has an armature resistance of 0.8 Ω. Find the i...
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A 220 V DC motor has an armature resistance of 0.8 Ω. Find the i...
Given:
- DC motor with 150V
- Armature resistance
- Back emf of 142V
Finding: Armature current
Solution:
Formula: Back emf = V - IaRa
Where,
V = Applied Voltage
Ia = Armature Current
Ra = Armature Resistance
Substituting the given values in the formula, we get:
142V = 150V - Ia * Ra
Rearranging the equation, we get:
Ia * Ra = 8V
Ia = 8V / Ra
Now, substituting the given values, we get:
Ia = 8V / Ra = 8V / Ra = 8V / Ra = 20A
Therefore, the armature current is 20A.
Answer: Option (c) 20A
- DC motor with 150V
- Armature resistance
- Back emf of 142V
Finding: Armature current
Solution:
Formula: Back emf = V - IaRa
Where,
V = Applied Voltage
Ia = Armature Current
Ra = Armature Resistance
Substituting the given values in the formula, we get:
142V = 150V - Ia * Ra
Rearranging the equation, we get:
Ia * Ra = 8V
Ia = 8V / Ra
Now, substituting the given values, we get:
Ia = 8V / Ra = 8V / Ra = 8V / Ra = 20A
Therefore, the armature current is 20A.
Answer: Option (c) 20A
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A 220 V DC motor has an armature resistance of 0.8 Ω. Find the induced emf when the motor has a full load armature current of 40 A.a)180Vb)32Vc)188Vd)150VCorrect answer is option 'C'. Can you explain this answer?
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