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

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Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.

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In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.

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In repulsion motor direction of rotation of motor is the same as that of brush shift.

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The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

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

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The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

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The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.

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How can we reverse the direction of rotation of synchronous motor?

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

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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  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

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 

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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.

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Description :

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

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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.

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Answer :

A hysteresis motor works on the principle of hysteresis loss.

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Description :

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

Answer :

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

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Description :

Describe with neat sketch working of hysteresis motor.

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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Answer :

The rotor of a hysteresis motor is made of chrome steel.

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Description :

Answer :

In a hysteresis motor, the rotor must have retentivity.

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59 views 1 answer
Description :

The direction of rotation of hysteresis motor is determined by the:  (A) Resistivity of the rotor material. (B) Amount of hysteresis loss. (C) Permeability of rotor material. (D) Position of shaded pole w.r.t main pole. 

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The efficiency of two identical transformers under load conditions can be determined by?

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

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What is magnetic hysteresis? What is the cause of hysteresis?

Answer :

Magnetic hysteresis: When a magnetic material is subjected to cycle of magnetization, it is found that flux density (B) in the material lags behind applied magnetizing force (H). This ... the movement of orientation, due to which the flux density lags behind the magnetic field intensity.

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State the factors affecting hysteresis loss.

Answer :

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

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Description :

Explain the hysteresis loop of a magnetic material with neat diagram.

Answer :

Hysteresis loop of magnetic material:  The circuit arrangement for plotting the hysteresis loop is shown in figure given below. The electromagnetic part consists of a coil wound on the iron ring ... one magnetic reversal is called hysteresis loop. Meaning of hysteresis is to lag behind.

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Description :

Hysteresis is commonly found in ______ A) ferromagnetic materials B) ferroelectric materials C) both A and B D) none of these

Answer :

Hysteresis is commonly found in ______ A) ferromagnetic materials B) ferroelectric materials C) both A and B D) none of these

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The term hysteresis is associated with (A) On-Off control (B) P-I control (C) Feed forward control (D) Ratio control

Answer :

The term hysteresis is associated with On-Off control

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Description :

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?

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

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In a magnetic material hysteresis loss takes place primarily due to?

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In a magnetic material hysteresis loss takes place primarily due to it high retentivity.

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As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.

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What is the difference between eddy current and hysteresis loss?

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Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

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Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

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Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

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What happens when you reverse the direction of the current in an electromagnet?

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When  you  reverse  current  direction  in  an  electromagnet,  the magnetic  poles  will  also  change.

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What is the direction of an AC current?

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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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What is the direction of flow of electric current in an electric circuit?

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It  flows  from  anode  to  cathode  (direction  of   holes  flow)

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The direction of rotation of a 3-phase induction motor is clockwise when it is supplied with 3-phase sinusoidal voltage having phase sequence A-B-C. For counter clockwise rotation of the motor, the phase sequence of the power supply should be  (A) B-C-A (B) C-A-B (C) A-C-B (D) B-C-A or C-A-B

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The direction of rotation of a 3-phase induction motor is clockwise when it is supplied with 3-phase sinusoidal voltage having phase sequence A-B-C. For counter clockwise rotation of the motor, the phase sequence of the power supply should be  A-C-B 

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Two non-collinear parallel equal forces acting in opposite direction?

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Two non-collinear parallel equal forces acting in opposite direction constitute a couple.

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What is the direction of flow when charging a capacitor?

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How does AC current change direction?

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This  is  because  the  angle  at  which  the   magnetic  fields  cuts  across  a  winding  changes  its  poles  thus  current  has  to  change  dirention  .

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What is the direction of the induced electric field?

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It  is  in  opposite  direction   to  the  one  that   produced  it.

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What is the direction of the induced current?

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What is the direction of the electric field?

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Electric   field    is  at   right angle   widh  flow  of  current  (right  hand   rule).

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What is the direction of flow of current?

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Current  flows  from  anode  to  cathode(opposite  direction  to  flow of  electrons)

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What is the direction of the flow of electrons?

Answer :

Electrons  flow    cathode   to   anode  or  in   an  oposite  direction  of   convection  current  flow  or  holes.

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Description :

What is the direction of the conventional current flow?

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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Description :

why current flows in opposite direction of electrons?

Answer :

Hi team, the current flow is nothing but flow of electrons But the conventional direction I'd opposite to actual current flow . ..

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Answer :

Yes DIAC can conduct in both direction.

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The speed of a universal motor is generally reduced by using gear trains.

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In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

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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?

Answer :

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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Description :

Answer :

In a shaded pole single-phase motor, the revolving field is produced by the use of shading coils.

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The rotor developed by a single-phase motor at starting is zero.

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

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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Answer :

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

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