A synchronous motor has better power factor as compared to that of an equivalent induction motor...

asked Mar 20, 2018 by anonymous

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

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answered Mar 20, 2018 by anonymous

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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asked Mar 18, 2018 by anonymous

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

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

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

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asked Mar 18, 2018 by anonymous

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

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

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

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asked Mar 18, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

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Last answer: An induction motor has relatively high power factor at near full load.

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asked Mar 20, 2018 by anonymous

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Last answer: The power factor of a single-phase induction motor is usually lagging.

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asked Mar 6, 2018 by anonymous

Can we make power factor of synchronous motor leading by adjusting its excitation?

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

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asked Mar 15, 2018 by anonymous

How can we improve power factor using synchronous motor?

How can we improve power factor using synchronous motor?

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asked Mar 3, 2018 by anonymous

At which time power factor of the induction motor is low?

At which time power factor of the induction motor is low?

Last answer: The power factor of the inducction motor is low at the time of starting as compare to while the induction motor is running.

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asked Dec 31, 2017 by anonymous

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Last answer: Ns equals f/pair pole 50/4 - 12.5

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asked Mar 18, 2018 by anonymous

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

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

Last answer: Synchronous motor has more efficiency.

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asked Mar 18, 2018 by anonymous

If we change the excitation of synchronous machine will it affect on power factor?

If we change the excitation of synchronous machine will it affect on power factor?

Last answer: Yes, If we change the excitation of synchronous machine it will affect on power factor. If the synchronous motor is overexcited then it will have leading power factor and if the motor is underexcited then it will have lagging power factor.

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asked Mar 20, 2018 by anonymous

The standard full-load power factor ratings for synchronous motors are?

Last answer: The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

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asked Mar 20, 2018 by anonymous

For power factor correction, synchronous motors operate at?

Last answer: For power factor correction, synchronous motors operate at no-load and greatly over-excited fields.

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asked Mar 20, 2018 by anonymous

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by...

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Last 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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asked Mar 20, 2018 by anonymous

In a distribution system, in order to improve power factor, the synchronous capacitors are installed?

Last answer: In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

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asked Mar 18, 2018 by anonymous

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

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

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asked Apr 28, 2018 by anonymous

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu

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asked Mar 18, 2018 by anonymous

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Last answer: In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

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asked Apr 29, 2018 by anonymous

In a synchronous generator delivering lagging power factor load

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asked Mar 19, 2018 by anonymous

Can a synchronous condenser improve power factor?

Can a synchronous condenser improve power factor?

Last answer: Yes, synchronous condenser can improve power factor.

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asked Mar 20, 2018 by anonymous

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?

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asked Apr 28, 2018 by anonymous

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asked Sep 22, 2018 by anonymous

Explain energy conservation technique “by improving power quality” for induction motor.

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asked Mar 20, 2018 by anonymous

In a synchronous motor, the armature current has large values for?

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asked Apr 28, 2018 by anonymous

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor.

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asked Mar 20, 2018 by anonymous

The coupling angle or load angle of synchronous motor is defined as the angle between the?

Last 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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asked Mar 18, 2018 by anonymous

Can we use the synchronous motor as the synchronous capacitor?

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asked Mar 20, 2018 by anonymous

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

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asked Mar 18, 2018 by anonymous

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

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asked Mar 18, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

The operating speed of a synchronous motor can be changed to new fixed value by?

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asked Mar 20, 2018 by anonymous

A synchronous motor running with normal excitation adjusts to load increases essentially by increase in?

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

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asked Mar 20, 2018 by anonymous

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?

Last 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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asked Mar 18, 2018 by anonymous

Hunting in synchronous motor cannot be due to?

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Last answer: Hunting in synchronous motor cannot be due to windage friction.

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asked Mar 18, 2018 by anonymous

The damping winding in synchronous motor is generally used to?

The damping winding in synchronous motor is generally used to?

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

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asked Mar 20, 2018 by anonymous

The efficiency of a properly designed synchronous motor will usually fall in range?

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

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asked Mar 20, 2018 by anonymous

In case one phase of a three-phase synchronous motor is short-circuited the motor will?

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

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asked Mar 20, 2018 by anonymous

The size of a synchronous motor decreases with the increase in?

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

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asked Mar 20, 2018 by anonymous

The duration of sudden short-circuit test on a synchronous motor is usually about?

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

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asked Mar 20, 2018 by anonymous

The construction of a synchronous motor resembles?

Last answer: The construction of a synchronous motor resembles an alternator.

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55 views 1 answer

asked Mar 20, 2018 by anonymous

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...

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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asked Mar 20, 2018 by anonymous

Slip-rings in a synchronous motor carry?

Last answer: Slip-rings in a synchronous motor carry direct current.

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asked Mar 20, 2018 by anonymous

A synchronous motor can develop synchronous torque?

Last answer: A synchronous motor can develop synchronous torque at synchronous speed.

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80 views 1 answer

asked Mar 20, 2018 by anonymous

The maximum constant load torque under which a synchronous motor will pull into synchronism...

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

Last 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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asked Mar 18, 2018 by anonymous

A synchronous motor can be made self starting by providing?

A synchronous motor can be made self starting by providing?

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

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asked Mar 18, 2018 by anonymous

In a synchronous motor which losses varies with load?

In a synchronous motor which losses varies with load?

Last answer: In a synchronous motor, copper losses varies with load.

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asked Apr 28, 2018 by anonymous

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW.

An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW

Last answer: An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is 83.33 kW

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asked Mar 20, 2018 by anonymous

Synchronsizing power of a synchronous machine is?

Last answer: Synchronsizing power of a synchronous machine is inversely proportional to the synchronous reactance.

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66 views 1 answer

asked Mar 20, 2018 by anonymous

The armature current of the synchronous motor?

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

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67 views 1 answer

asked Mar 18, 2018 by anonymous

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

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

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

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