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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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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 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 :

Answer :

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

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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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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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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 :

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 :

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 effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.

Answer :

The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor

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429 views 1 answer
Description :

In synchronous motor, does the winding losses vary with load?

Answer :

No, in the synchronous motor the winding losses do not vary with load.

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499 views 1 answer
Description :

Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop

Answer :

Torque angle for the synchronous machine is the angle between rotor magnetic field and net magnetic field in the air gap

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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 :

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu, 0.866 pu (B) 0.866 pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu

Answer :

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are 0.866 pu, 0.5 pu

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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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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 :

Answer :

Slip-rings in a synchronous motor carry direct current.

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

A synchronous motor can develop synchronous torque at synchronous speed.

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

The construction of a synchronous motor resembles an alternator.

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Description :

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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Description :

Answer :

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

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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 reverse the direction of rotation of synchronous motor?

Answer :

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

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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 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 :

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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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 :

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 :

Three phase synchronous motor will have how many sliprings?

Answer :

Three phase synchronous motor will have two sliprings.

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Description :

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. lf its shaft load is reduced by half and field current is held constant then its new power factor will be

Answer :

Leading

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Description :

Answer :

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

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Description :

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load  (A) The armature current increases and the power factor decreases  (B) The armature current decreases and the power factor also decreases  (C) The armature current decreases and the power factor increases but is lagging  (D) The armature current decreases and the power factor increases and is leading

Answer :

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load The armature current decreases and the power factor increases and is leading

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96 views 1 answer
Description :

In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) excitation emf leads the terminal voltage by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

Answer :

In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle

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232 views 1 answer
Description :

what is the difference between synchronous and asynchronous motor?

Answer :

Asynchronous motors and syncrouns motor are called as dc machines.  and also syncrouns motor called as induction motor. Asynonymous motor as are rotates with constant speed we not able to operate . ... It is able to operate. These are a small difference between syncrouns and asynchronous motors. 

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Description :

Answer :

An over excited synchronous motor on noload is known as synchronous condenser.

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63 views 1 answer
Description :

Why does the speed of a DC shunt motor decrease as the load increases?

Answer :

Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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Description :

Answer :

As the load is increased the speed of D.C. shunt motor will reduce slightly.

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Description :

Answer :

The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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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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Description :

List different torques in synchronous motor. 

Answer :

Different Torques in Synchronous Motor: 1) Starting torque 2) Running torque 3) Pull-in torque 4) Pull-out torque

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59 views 1 answer
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