Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > In an induction motor, if the rotor resistanc... Start Learning for Free
In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque is
- a)Less than starting torque
- b)Equal to starting torque
- c)More than starting torque
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In an induction motor, if the rotor resistance is equal to standstill ...
At maximum torque, rotor resistance is equal to slip times of reactance.
At starting condition (s = 1), rotor resistance is equal to standstill reactance.
Most Upvoted Answer
In an induction motor, if the rotor resistance is equal to standstill ...
Introduction:
Induction motor is a type of AC motor where the rotor rotates at a speed less than the synchronous speed of the stator magnetic field. It operates on the principle of electromagnetic induction. The maximum torque that can be produced by the motor is an important parameter.
Explanation:
When the rotor resistance is equal to standstill reactance, it is called the maximum torque condition. At this condition, the slip of the motor is maximum, i.e., the rotor speed is minimum. The torque produced by the motor is maximum at this condition.
The starting torque of the motor is the torque produced by the motor when it is started from standstill. The starting torque is given by the equation T_s = (3V^2 / 2πf) * (R_2 / (R_1^2 + X_1^2))^2, where V is the supply voltage, f is the frequency, R_1 and X_1 are the stator resistance and reactance, and R_2 is the rotor resistance.
When the rotor resistance is equal to standstill reactance, i.e., R_2 = X_2, the starting torque of the motor is maximum. At this condition, the rotor current is maximum, and the torque produced by the motor is also maximum.
Therefore, when the rotor resistance is equal to standstill reactance, the maximum torque produced by the motor is equal to the starting torque.
Conclusion:
In an induction motor, when the rotor resistance is equal to standstill reactance, the maximum torque produced by the motor is equal to the starting torque.
Induction motor is a type of AC motor where the rotor rotates at a speed less than the synchronous speed of the stator magnetic field. It operates on the principle of electromagnetic induction. The maximum torque that can be produced by the motor is an important parameter.
Explanation:
When the rotor resistance is equal to standstill reactance, it is called the maximum torque condition. At this condition, the slip of the motor is maximum, i.e., the rotor speed is minimum. The torque produced by the motor is maximum at this condition.
The starting torque of the motor is the torque produced by the motor when it is started from standstill. The starting torque is given by the equation T_s = (3V^2 / 2πf) * (R_2 / (R_1^2 + X_1^2))^2, where V is the supply voltage, f is the frequency, R_1 and X_1 are the stator resistance and reactance, and R_2 is the rotor resistance.
When the rotor resistance is equal to standstill reactance, i.e., R_2 = X_2, the starting torque of the motor is maximum. At this condition, the rotor current is maximum, and the torque produced by the motor is also maximum.
Therefore, when the rotor resistance is equal to standstill reactance, the maximum torque produced by the motor is equal to the starting torque.
Conclusion:
In an induction motor, when the rotor resistance is equal to standstill reactance, the maximum torque produced by the motor is equal to the starting torque.
 | Explore Courses for Electrical Engineering (EE) exam |  |
Top Courses for Electrical Engineering (EE)View all
Top Courses for Electrical Engineering (EE)
Question Description
In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer?.
In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer?.
Solutions for In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice In an induction motor, if the rotor resistance is equal to standstill reactance then the maximum torque isa)Less than starting torqueb)Equal to starting torquec)More than starting torqued)None of theseCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
| Explore Courses for Electrical Engineering (EE) exam | |
Top Courses for Electrical Engineering (EE)
Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
