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A cumulatively compounded long shunt motor isdriving a load at rated torque and rated speed.If the series field is shunted by a resistance equalto the resistance of the series field keeping the torque constant,
  • a)
    the armature current increases
  • b)
    the motor speed increases
  • c)
    the armature current decreases
  • d)
    the motor speed decreases
Correct answer is option 'A'. Can you explain this answer?
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A cumulatively compounded long shunt motor isdriving a load at rated t...
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A cumulatively compounded long shunt motor isdriving a load at rated t...
Explanation:
In a cumulatively compounded long shunt motor, the series field and shunt field are connected in parallel across the armature. The series field winding is designed to provide a weaker field as compared to the shunt field winding. This arrangement allows the motor to operate at rated torque and speed.

When the series field is shunted by a resistance equal to the resistance of the series field, the shunt field current increases. This increase in shunt field current strengthens the shunt field winding, resulting in a stronger magnetic field around the armature.

The effect of a stronger shunt field is to increase the back EMF generated by the motor. The back EMF opposes the supply voltage, causing a decrease in armature current. However, since the resistance of the series field is equal to the shunt field resistance, the increase in shunt field current compensates for the decrease in armature current, keeping the torque constant.

Answer:
Therefore, the correct answer is option 'A' - the armature current increases.
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A cumulatively compounded long shunt motor isdriving a load at rated torque and rated speed.If the series field is shunted by a resistance equalto the resistance of the series field keeping the torque constant,a)the armature current increasesb)the motor speed increasesc)the armature current decreasesd)the motor speed decreasesCorrect answer is option 'A'. Can you explain this answer?
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A cumulatively compounded long shunt motor isdriving a load at rated torque and rated speed.If the series field is shunted by a resistance equalto the resistance of the series field keeping the torque constant,a)the armature current increasesb)the motor speed increasesc)the armature current decreasesd)the motor speed decreasesCorrect 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 A cumulatively compounded long shunt motor isdriving a load at rated torque and rated speed.If the series field is shunted by a resistance equalto the resistance of the series field keeping the torque constant,a)the armature current increasesb)the motor speed increasesc)the armature current decreasesd)the motor speed decreasesCorrect 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 A cumulatively compounded long shunt motor isdriving a load at rated torque and rated speed.If the series field is shunted by a resistance equalto the resistance of the series field keeping the torque constant,a)the armature current increasesb)the motor speed increasesc)the armature current decreasesd)the motor speed decreasesCorrect answer is option 'A'. Can you explain this answer?.
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