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If the DC machine is held constant at 3000 rpm. The DC voltage is 250V and speed is 2950. 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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Verified 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.
Most Upvoted Answer
If the DC machine is held constant at 3000 rpm. The DC voltage is 250V...
Actually generator only produce a.c. current and that doesn't not work at dc
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Community Answer
If the DC machine is held constant at 3000 rpm. The DC voltage is 250V...
Explanation:
To determine whether the DC machine is a motor or a generator, we need to analyze the relationship between the input and output variables. In this case, the input variables are the DC voltage and the field voltage, while the output variable is the rotational speed of the machine.
Input Variables:
- DC Voltage: 250V
- Field Voltage: 250V
Output Variable:
- Rotational Speed: 3000 rpm
Motor Operation:
In a DC motor, the input voltage (DC voltage) is used to create a magnetic field through the field windings. The interaction between this magnetic field and the armature windings produces a torque that causes the rotor to rotate. The rotational speed of the motor is directly proportional to the applied voltage. Therefore, if the input voltage is held constant at 250V and the machine is rotating at 3000 rpm, it indicates that the machine is functioning as a motor.
Generator Operation:
In a DC generator, the rotational motion of the rotor creates a changing magnetic field, which induces a voltage in the armature windings. This generated voltage is then outputted as the generator's output voltage. The rotational speed of the generator is also directly proportional to the output voltage. In this case, if the input voltage (field voltage) is held constant at 250V and the machine is rotating at 3000 rpm, it suggests that the machine is not generating an output voltage. Therefore, it is not operating as a generator.
Conclusion:
Based on the given information, the DC machine is operating as a motor. Since the input variables (DC voltage and field voltage) remain constant, and the output variable (rotational speed) is non-zero, it confirms that the machine is functioning as a motor. Hence, the correct answer is option 'A' - Motor.
To determine whether the DC machine is a motor or a generator, we need to analyze the relationship between the input and output variables. In this case, the input variables are the DC voltage and the field voltage, while the output variable is the rotational speed of the machine.
Input Variables:
- DC Voltage: 250V
- Field Voltage: 250V
Output Variable:
- Rotational Speed: 3000 rpm
Motor Operation:
In a DC motor, the input voltage (DC voltage) is used to create a magnetic field through the field windings. The interaction between this magnetic field and the armature windings produces a torque that causes the rotor to rotate. The rotational speed of the motor is directly proportional to the applied voltage. Therefore, if the input voltage is held constant at 250V and the machine is rotating at 3000 rpm, it indicates that the machine is functioning as a motor.
Generator Operation:
In a DC generator, the rotational motion of the rotor creates a changing magnetic field, which induces a voltage in the armature windings. This generated voltage is then outputted as the generator's output voltage. The rotational speed of the generator is also directly proportional to the output voltage. In this case, if the input voltage (field voltage) is held constant at 250V and the machine is rotating at 3000 rpm, it suggests that the machine is not generating an output voltage. Therefore, it is not operating as a generator.
Conclusion:
Based on the given information, the DC machine is operating as a motor. Since the input variables (DC voltage and field voltage) remain constant, and the output variable (rotational speed) is non-zero, it confirms that the machine is functioning as a motor. Hence, 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 and speed is 2950. 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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If the DC machine is held constant at 3000 rpm. The DC voltage is 250V and speed is 2950. 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? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about If the DC machine is held constant at 3000 rpm. The DC voltage is 250V and speed is 2950. 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? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If the DC machine is held constant at 3000 rpm. The DC voltage is 250V and speed is 2950. 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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