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If the DC machine is held constant at 3000 rpm. The DC voltage is 250V. If the field is held constant with 250V. Is this machine generator or motor?
- a)Motor
- b)Generator
- c)None of the mentioned
- d)Any of the mentioned
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
If the DC machine is held constant at 3000 rpm. The DC voltage is 250V...
From the speed and emf relation, E = 250*2950/3000
= 245.8 V
This is less than the terminal voltage. Hence it is a motor.
= 245.8 V
This is less than the terminal voltage. Hence it is a motor.
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Community Answer
If the DC machine is held constant at 3000 rpm. The DC voltage is 250V...
Motor or Generator?
To determine whether the DC machine is operating as a motor or a generator, we need to consider the relationship between the electrical input and the mechanical output.
Operating Conditions
- Constant speed: 3000 rpm
- DC voltage: 250V
- Field voltage: 250V
Motor Operation
In motor operation, electrical energy is converted into mechanical energy to drive a load. The machine acts as a motor when the electrical input is used to rotate the shaft at a constant speed.
Generator Operation
In generator operation, mechanical energy is converted into electrical energy. The machine acts as a generator when a mechanical force or prime mover rotates the shaft, generating electrical power.
Analysis
- The constant speed of 3000 rpm suggests that the machine is operating with a fixed mechanical output.
- The DC voltage of 250V indicates that electrical power is being supplied to the machine.
- The field voltage of 250V implies that the field current is held constant, ensuring a fixed magnetic field strength.
Conclusion
Based on the given operating conditions, we can conclude that the machine is operating as a motor. The constant speed and supplied electrical power indicate that the machine is using electrical energy to produce mechanical work.
Therefore, the correct answer is option 'A' - Motor.
To determine whether the DC machine is operating as a motor or a generator, we need to consider the relationship between the electrical input and the mechanical output.
Operating Conditions
- Constant speed: 3000 rpm
- DC voltage: 250V
- Field voltage: 250V
Motor Operation
In motor operation, electrical energy is converted into mechanical energy to drive a load. The machine acts as a motor when the electrical input is used to rotate the shaft at a constant speed.
Generator Operation
In generator operation, mechanical energy is converted into electrical energy. The machine acts as a generator when a mechanical force or prime mover rotates the shaft, generating electrical power.
Analysis
- The constant speed of 3000 rpm suggests that the machine is operating with a fixed mechanical output.
- The DC voltage of 250V indicates that electrical power is being supplied to the machine.
- The field voltage of 250V implies that the field current is held constant, ensuring a fixed magnetic field strength.
Conclusion
Based on the given operating conditions, we can conclude that the machine is operating as a motor. The constant speed and supplied electrical power indicate that the machine is using electrical energy to produce mechanical work.
Therefore, the correct answer is option 'A' - Motor.
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If the DC machine is held constant at 3000 rpm. The DC voltage is 250V. If the field is held constant with 250V. Is this machine generator or motor?a)Motorb)Generatorc)None of the mentionedd)Any of the mentionedCorrect answer is option 'A'. Can you explain this answer?
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