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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Which of the following will be representing the ∅𝒓 Vs 𝑵?
A
B
C
D
B
The correct answer is B · The graph represents the characteristics of a three-phase induction motor, where the output torque (𝑇) is plotted against the speed (𝑁) · It typically illustrates how torque varies with speed under different operating conditions.
The correct answer is B · The graph represents the characteristics of a three-phase induction motor, where the output torque (𝑇) is plotted against the speed (𝑁) · It typically illustrates how torque varies with speed under different operating conditions.
T∝I2 — Represents the relationship between the torque (T) and the rotor current (I).
N=Ns(1−SmaxS) — Indicates the relationship between synchronous speed (Ns), rotor speed (N), and slip (S).
The working principle of an induction motor involves the interaction between the rotating magnetic field produced by the stator and the current induced in the rotor · As the rotor accelerates, the slip (the difference in speed between the stator's magnetic field and rotor) adjusts, affecting the torque produced · In the torque-speed characteristic curve, different regions represent starting, rated, and breakdown torque.
Three-phase induction motors operate under the principle of electromagnetic induction.
The torque-speed curve shows three distinct regions: starting, rated, and breakdown.
Robust and reliable operation
Wide range of applications in industrial settings
Lower efficiency compared to synchronous motors
Slip causes performance to vary with load
Pumps and fans
Conveyors and compressors
Standard operating characteristics for induction motors often apply.
Option A is wrong because it does not show the correct torque-speed relationship.
B is correct — the graph accurately captures the operating characteristics of a three-phase induction motor with torque plotted against speed.
Understanding the interaction between torque and speed is crucial for analyzing motor performance in various applications.