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A DC machine is operating as a generator and supplying 8 kW at terminal voltage of 300 V. After a while, it is used as a motor with terminal voltage and armature current remaining same. If the flux per pole is increased by 25% when shifting from generator to motor, what was the change in the speed while doing so, given that the armature resistance is 0.5 Ω ?
  • a)
    Decreases by 26.8%
  • b)
    Increases by 26.8%
  • c)
    Decreases by 13.4%
  • d)
    Increases by 13.4%
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A DC machine is operating as a generator and supplying 8 kW at termina...
When working as generator, armature current, 
= 26.67A
Eg = 300 + (26.67 × 0.5)
= 313.33 V
As motor, Em = V – IaRa
= 300 – (26.67 × 0.5)
= 286.67 V
Now, E α Nϕ
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A DC machine is operating as a generator and supplying 8 kW at terminal voltage of 300 V. After a while, it is used as a motor with terminal voltage and armature current remaining same. If the flux per pole is increased by 25% when shifting from generator to motor, what was the change in the speed while doing so, given that the armature resistance is 0.5 Ω ?a)Decreases by 26.8%b)Increases by 26.8%c)Decreases by 13.4%d)Increases by 13.4%Correct answer is option 'A'. Can you explain this answer?
Question Description
A DC machine is operating as a generator and supplying 8 kW at terminal voltage of 300 V. After a while, it is used as a motor with terminal voltage and armature current remaining same. If the flux per pole is increased by 25% when shifting from generator to motor, what was the change in the speed while doing so, given that the armature resistance is 0.5 Ω ?a)Decreases by 26.8%b)Increases by 26.8%c)Decreases by 13.4%d)Increases by 13.4%Correct 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 machine is operating as a generator and supplying 8 kW at terminal voltage of 300 V. After a while, it is used as a motor with terminal voltage and armature current remaining same. If the flux per pole is increased by 25% when shifting from generator to motor, what was the change in the speed while doing so, given that the armature resistance is 0.5 Ω ?a)Decreases by 26.8%b)Increases by 26.8%c)Decreases by 13.4%d)Increases by 13.4%Correct 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 machine is operating as a generator and supplying 8 kW at terminal voltage of 300 V. After a while, it is used as a motor with terminal voltage and armature current remaining same. If the flux per pole is increased by 25% when shifting from generator to motor, what was the change in the speed while doing so, given that the armature resistance is 0.5 Ω ?a)Decreases by 26.8%b)Increases by 26.8%c)Decreases by 13.4%d)Increases by 13.4%Correct answer is option 'A'. Can you explain this answer?.
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