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Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be
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Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be 25 N -m

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In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.

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In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then the flux first decreases and then increases in the same direction

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In a 3-phase slip-ring induction motor, the slip at some speed is 0.05. The speed is reduced by inserting an external resistance in the rotor circuit and the slip is 0.15. If the rotor winding resistance per phase is 0.2 Ω, the external resistance is (A) 0.2 Ω (B) 0.3 Ω (C) 0.4 Ω (D) 0.5 Ω

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speed control methods of three phase induction motor?

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For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

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The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.

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State any four advantages of three phase induction motor. 

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Advantages of three phase induction motor https://youtu.be/27OIOCKN05U

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how can we reverse the direction of rotation of three phase induction motor ?

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A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

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In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will remain unchanged.

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In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.

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In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

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In a single-phase induction motor, the operating direction is determined by the Starting circuit

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The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it helps in reducing the tendency of the rotor teeth to remain under the stator teeth.

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Is induction motor is self starting?

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Single phase induction motor is not self starting. Three phase induction motor is self starting.

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What is the definition of induction motor?

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its working on magnetic base made by coils and its work with 1 phase or 3 phase ac or dc supply

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What is the function of induction motor?

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while you give supply to motor its motor run on magnet base 

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At which time power factor of the induction motor is low?

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The power factor of the inducction motor is low at the time of starting as compare to while the induction motor is running.

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Induction motor is a AC motor it is also known as asynchronous motor .

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if induction motor rotates exceed than its synchronous speed, it acts as a generator.

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Induction motor

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Induction Motor Inductor is a coil of wire which possess the property of inductance. Inductance is the property of an electric conductor which generate electromotive force (EMF ... motor are classified as slip ring induction motor and squirrel cage induction motor.

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In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

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In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is : 0.075

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Explain the working of a single phase capacitor start induction motor. 

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Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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