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Answer :

The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.

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Last Answer : The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching

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Last Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.

Last Answer : A hysteresis motor works on the principle of hysteresis loss.

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Last Answer : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator 

Last Answer : To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.

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

Last Answer : The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.

Description : Describe with neat sketch working of hysteresis motor.

Last Answer : Working: When stator is energized with single phase ac supply, rotating magnetic field is produced because of starting (auxiliary) and main windings, which remain in circuit permanently. The ... the principle of magnetic locking this motor either rotates at synchronous speed or not at all.

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Last Answer : In a hysteresis motor, the rotor must have retentivity.

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Last Answer : The efficiency of two identical transformers under load conditions can be determined by back-to-back test.

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Description : State the factors affecting hysteresis loss.

Last Answer : i) Flux density ii) Frequency iii) Volume of the magnetic material iv) Nature of magnetic material

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Last Answer : If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be large.

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Description : What is the direction of an AC current?

Last Answer : The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.

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Last Answer : The conventional current flow in opposite direction of flow of electrons. The electrons flow from negative terminal of battery to positive terminal of battery. And conventional current flow from positive terminal of battery to negative terminal of battery.

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Last Answer : Yes DIAC can conduct in both direction.

Description : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

Last Answer : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.

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