In Induction motor the energy is transferred via the __________ & entirely __________ .

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Examoogle · Accepted Answer

Option D: Air Gap & Inductively

Explanation & Concepts:
In an induction motor, energy is transferred via the air gap and entirely inductively. This means that the interaction between the stator's rotating magnetic field and the rotor induces a current in the rotor, which leads to torque production.

Working Principle: The operation of an induction motor is based on electromagnetic induction. As the stator winding is energized, it creates a rotating magnetic field that passes through the air gap towards the rotor. This varying field induces a current in the rotor conductors, resulting in a magnetic field that interacts with the stator’s field, producing torque and causing the rotor to turn.

Key Formulas: $P = \frac{3V \cdot I \cdot \cos \phi}{1000}$ — Power output of the motor; $T = \frac{P \cdot 60}{2\pi N}$ — Torque produced by the motor

Key Points: Induction motors are widely used because of their simplicity and robustness.; The efficiency of energy transfer through induction is high due to minimal heat losses.

Advantages: High reliability and durability.; Low maintenance requirements.

Disadvantages: Less efficient at low speeds compared to other motor types.; Requires a slip to operate, which affects performance.

Applications: Used in fans, pumps, and conveyor systems.; Common in industrial machinery due to their ability to handle variable loads.

Additional Info: Common frequency range for induction motors is 50-60 Hz.. Option A is incorrect as it mentions conductivity instead of inductively, which does not accurately describe the process.

Answer: D is correct — energy in induction motors is transferred via the air gap and entirely inductively through electromagnetic induction.

Exam Tip: Understand the basic principles of electromagnetic induction, as they apply to various electrical machines, to tackle related questions effectively.

Examoogle · Answer

Option A: Air Gap & Inductively + Conductivity

Examoogle · Answer

Option B: Core & Conductivity

Examoogle · Answer

Option C: Air Gap & Conductivity

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