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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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Description :

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

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.

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Description :

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

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

Answer :

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

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Description :

Can we use the synchronous motor as the synchronous capacitor?

Answer :

Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.

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Description :

If we change the excitation of synchronous machine will it affect on motor speed?

Answer :

No, If we change the excitation of synchronous machine it will not affect on motor speed.

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Description :

How can we improve power factor using synchronous motor?

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Description :

Three phase synchronous motor will have how many sliprings?

Answer :

Three phase synchronous motor will have two sliprings.

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Answer :

The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

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A synchronous motor can develop synchronous torque at synchronous speed.

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A synchronous motor can be made self starting by providing?

Answer :

A synchronous motor can be made self-starting by providing damper bar.

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Answer :

Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.

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Answer :

Slip-rings in a synchronous motor carry direct current.

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Answer :

The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

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Description :

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

Answer :

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.

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Answer :

A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.

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Answer :

In case one phase of a three-phase synchronous motor is short-circuited the motor will not start.

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In a synchronous motor, the armature current has large values for high and low excitation.

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 The size of a synchronous motor decreases with the increase in flux density.

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Answer :

The duration of sudden short-circuit test on a synchronous motor is usually about one second.

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Description :

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

Answer :

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

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Description :

Answer :

The construction of a synchronous motor resembles an alternator.

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Answer :

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.

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Description :

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

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Answer :

The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.

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Answer :

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.

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Answer :

The armature current of the synchronous motor has large values for low and high excitation.

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Description :

Which motor have more efficiency, synchronous motor or induction motor?

Answer :

Synchronous motor has more efficiency.

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Description :

What is the maximum value of torque angle in synchronous motor?

Answer :

The maximum value of torque angle in synchronous motor is 90 degrees electrical.

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Description :

If the load of the normally excited synchronous motor is increased the power factor will?

Answer :

If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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Description :

Hunting in synchronous motor cannot be due to?

Answer :

Hunting in synchronous motor cannot be due to windage friction.

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Description :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Answer :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

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Description :

The damping winding in synchronous motor is generally used to?

Answer :

The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

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Description :

If the field of synchronous motor is under excited, power factor will be?

Answer :

If the field of synchronous motor is under excited, power factor will be lagging.

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Description :

An unexcited single phase synchronous motor is ?

Answer :

An unexcited single-phase synchronous motor is reluctance motor.

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Description :

In a synchronous motor which losses varies with load?

Answer :

In a synchronous motor, copper losses varies with load.

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Description :

The back emf of synchronous motor depends on?

Answer :

The back emf of synchronous motor depends on load angle.

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Description :

Synchronous motor always runs at which speed?

Answer :

Synchronous motor always runs at synchronous speed.

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Description :

The synchronous motor will develop maximum power when the load angle is?

Answer :

The synchronous motor will develop maximum power when the load angle is 900.

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Description :

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

Answer :

When excitation of an unloaded salient pole synchronous motor suddenly gets disconnected the motor will stop.

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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 :

List different starting methods of three phase synchronous motor. Explain any one of them.

Answer :

Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor. 

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Description :

Draw and explain V and inverted V curves for synchronous motor.

Answer :

V curves' and inverted V curves' for Synchronous Motor:  V curve:  V curve is a plot of the stator current versus field current for different constant loads. The graph is plotted ... Vcurves of synchronous motor. The highest point on each of these curves indicates unity power factor.

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