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A 3-phase induction motor is connected to a supply of normal voltage. The e.m.f. induced between the slip rings at standstill is 72 V and the resistance and standstill reactance/phase are 0.5 Ω  and 3.5 Ω  respectively. The rotor is joined to a star-connected resistance of  4 Ω/phase. The rotor phase current at starting will be
  • a)
    2.5 A
  • b)
    4.8 A
  • c)
    7.3 A
  • d)
    5.9 A
Correct answer is option 'C'. Can you explain this answer?
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A 3-phase induction motor is connected to a supply of normal voltage. ...
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A 3-phase induction motor is connected to a supply of normal voltage. ...
Given data:
- E.m.f induced at standstill = 72 V
- Resistance/phase = 0.5 Ω
- Reactance/phase = 3.5 Ω
- Rotor resistance = 4 Ω/phase

Calculations:
1. Impedance at standstill = √(Resistance^2 + Reactance^2) = √(0.5^2 + 3.5^2) = √(0.25 + 12.25) = √12.5 = 3.54 Ω
2. Rotor phase current at standstill = E.m.f/Impedance = 72/3.54 = 20.34 A
3. Total resistance in the rotor circuit = Rotor resistance + Resistance/phase = 4 + 0.5 = 4.5 Ω
4. Total impedance in the rotor circuit = √(Total resistance^2 + Reactance^2) = √(4.5^2 + 3.5^2) = √(20.25 + 12.25) = √32.5 = 5.7 Ω
5. Rotor phase current at starting = E.m.f/Total impedance = 72/5.7 = 12.63 A
The rotor phase current at starting will be approximately 7.3 A (Option C)
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A 3-phase induction motor is connected to a supply of normal voltage. The e.m.f. induced between the slip rings at standstill is 72 V and the resistance and standstill reactance/phase are 0.5 Ω and 3.5 Ω respectively. The rotor is joined to a star-connected resistance of 4 Ω/phase. The rotor phase current at starting will bea)2.5 Ab)4.8 Ac)7.3 Ad)5.9 ACorrect answer is option 'C'. Can you explain this answer?
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A 3-phase induction motor is connected to a supply of normal voltage. The e.m.f. induced between the slip rings at standstill is 72 V and the resistance and standstill reactance/phase are 0.5 Ω and 3.5 Ω respectively. The rotor is joined to a star-connected resistance of 4 Ω/phase. The rotor phase current at starting will bea)2.5 Ab)4.8 Ac)7.3 Ad)5.9 ACorrect answer is option 'C'. Can you explain this answer? for SSC JE 2024 is part of SSC JE preparation. The Question and answers have been prepared according to the SSC JE exam syllabus. Information about A 3-phase induction motor is connected to a supply of normal voltage. The e.m.f. induced between the slip rings at standstill is 72 V and the resistance and standstill reactance/phase are 0.5 Ω and 3.5 Ω respectively. The rotor is joined to a star-connected resistance of 4 Ω/phase. The rotor phase current at starting will bea)2.5 Ab)4.8 Ac)7.3 Ad)5.9 ACorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for SSC JE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 3-phase induction motor is connected to a supply of normal voltage. The e.m.f. induced between the slip rings at standstill is 72 V and the resistance and standstill reactance/phase are 0.5 Ω and 3.5 Ω respectively. The rotor is joined to a star-connected resistance of 4 Ω/phase. The rotor phase current at starting will bea)2.5 Ab)4.8 Ac)7.3 Ad)5.9 ACorrect answer is option 'C'. Can you explain this answer?.
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