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The back emf of synchronous motor depends on?

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The back emf of synchronous motor depends on load angle.

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What is back EMF of synchronous motor?

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What is the back EMF of the motor?

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The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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The armature may burn if the back e.m.f. of a D.C. motor vanishes suddenly.

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What is back emf? 

Answer :

Back EMF: When a current carrying conductor is placed in a magnetic field it experiences a force; when it moves due to the force it (conductor) cuts the magnetic field due to which an emf is ... (hence the applied armature voltage) is opposed by the induced emf which is therefore called as Back emf.

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Do AC induction motors have back EMF?

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What is the back EMF?

Answer :

When the armature of a d.c. motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence e.m.f. is induced in them as in a generator. The ... that energy conversion in a d.c. motor is only possible due to the production of back emf.

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In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.

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

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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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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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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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Slip-rings in a synchronous motor carry direct current.

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

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

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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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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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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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The construction of a synchronous motor resembles an alternator.

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

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

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

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Synchronous motor has more efficiency.

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

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

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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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Hunting in synchronous motor cannot be due to?

Answer :

Hunting in synchronous motor cannot be due to windage friction.

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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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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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An unexcited single phase synchronous motor is ?

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An unexcited single-phase synchronous motor is reluctance motor.

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A synchronous motor can be made self starting by providing?

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

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In a synchronous motor which losses varies with load?

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In a synchronous motor, copper losses varies with load.

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Synchronous motor always runs at which speed?

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Synchronous motor always runs at synchronous speed.

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Can we use the synchronous motor as the synchronous capacitor?

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

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

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

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

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

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Three phase synchronous motor will have how many sliprings?

Answer :

Three phase synchronous motor will have two sliprings.

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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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Answer :

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

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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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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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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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