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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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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)
- 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 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC 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 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?.
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 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC 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 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?.
Solutions 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? in English & in Hindi are available as part of our courses for SSC.
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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?, a detailed solution 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? has been provided alongside types of 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? theory, EduRev gives you an
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