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A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90º, the speed is likely to be
  • a)
    about 300 rpm
  • b)
    about 150 rpm
  • c)
    about 75 rpm
  • d)
    about zero
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A dc separately excited motor has a constant field current. The armatu...
Average output voltage is reduced to 50% if a = 90º. Hence speed is also reduced to 50%.
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A dc separately excited motor has a constant field current. The armatu...
When a = 0 (i.e., the firing angle of the semi-converter is 0), the armature voltage is maximum and the motor runs at its maximum speed of 600 rpm.

When a = 90 (i.e., the firing angle of the semi-converter is 90 degrees), the armature voltage is reduced due to the phase control of the semi-converter. This reduction in armature voltage will cause a decrease in the motor speed.

The exact speed at a = 90 cannot be determined without more information about the characteristics of the motor and the semi-converter. However, it can be inferred that the speed will be lower than 600 rpm.
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A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90º, the speed is likely to bea)about 300 rpmb)about 150 rpmc)about 75 rpmd)about zeroCorrect answer is option 'A'. Can you explain this answer?
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A dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90º, the speed is likely to bea)about 300 rpmb)about 150 rpmc)about 75 rpmd)about zeroCorrect 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 dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90º, the speed is likely to bea)about 300 rpmb)about 150 rpmc)about 75 rpmd)about zeroCorrect 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 dc separately excited motor has a constant field current. The armature is fed from a single phase supply through a semi-converter. When a = 0, speed is 600 rpm. If a = 90º, the speed is likely to bea)about 300 rpmb)about 150 rpmc)about 75 rpmd)about zeroCorrect answer is option 'A'. Can you explain this answer?.
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