How can we improve power factor using synchronous motor?

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asked Mar 15, 2018 by anonymous

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asked Mar 19, 2018 by anonymous

Can a synchronous condenser improve power factor?

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

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63 views 1 answer

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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104 views 1 answer

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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83 views 1 answer

asked Dec 16, 2017 by anonymous

How does a capacitor improve power factor?

Last answer: Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.

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131 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

Last 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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86 views 1 answer

asked Mar 18, 2018 by anonymous

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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80 views 1 answer

asked Mar 18, 2018 by anonymous

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

Last 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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69 views 1 answer

asked Mar 18, 2018 by anonymous

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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151 views 1 answer

asked Aug 18, 2019 by anonymous

Why capacitors are used to improve power factor?

Last answer: Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

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112 views 3 answers

asked Mar 18, 2018 by anonymous

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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82 views 1 answer

asked Apr 29, 2018 by anonymous

In a synchronous generator delivering lagging power factor load

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

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

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178 views 1 answer

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

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

Last 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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50 views 1 answer

asked Apr 28, 2018 by anonymous

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Last answer: The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

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71 views 1 answer

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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66 views 1 answer

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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76 views 1 answer

asked Mar 3, 2018 by anonymous

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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133 views 1 answer

asked Mar 18, 2018 by anonymous

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

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

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185 views 1 answer

asked Apr 28, 2018 by anonymous

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

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

Last answer: Leading

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455 views 2 answers

asked Mar 18, 2018 by anonymous

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

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

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80 views 1 answer

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?

Last 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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91 views 1 answer

asked Mar 20, 2018 by anonymous

The power factor of a single-phase induction motor is usually?

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

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99 views 1 answer

asked Mar 20, 2018 by anonymous

An induction motor has relatively high power factor at?

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

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64 views 1 answer

asked Mar 18, 2018 by anonymous

Can we use the synchronous motor as the synchronous capacitor?

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

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76 views 1 answer

asked May 17, 2020 by anonymous

What is the value of capacitance required to improve power factor from 0.7 to 0.9.

What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz #powerfactor

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184 views 0 answers

asked May 17, 2020 by anonymous

Briefly explain how the power factor of an inductive circuit can be improved.

Last answer: As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.

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95 views 1 answer

asked Mar 18, 2018 by anonymous

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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68 views 1 answer

asked Mar 10, 2018 by anonymous

Why do we need to correct power factor?

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52 views 0 answers

asked May 8, 2018 by anonymous

Damper winding in a synchronous motor

Last answer: Damper winding in a synchronous motor Serves to start the motor.

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58 views 1 answer

asked Apr 28, 2018 by anonymous

The effect of increasing load on a synchronous motor running with normal excitation is

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.

Last 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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399 views 1 answer

asked Mar 20, 2018 by anonymous

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

Last 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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87 views 1 answer

asked Mar 20, 2018 by anonymous

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

Last answer: Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

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139 views 1 answer

asked Mar 20, 2018 by anonymous

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?

Last answer: If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.

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69 views 1 answer

asked Mar 15, 2018 by anonymous

Why synchronous motor Cannot start itself?

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58 views 0 answers

asked Mar 15, 2018 by anonymous

What is the principle of synchronous motor?

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54 views 0 answers

asked Mar 15, 2018 by anonymous

What is the use of synchronous motor?

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57 views 0 answers

asked Mar 15, 2018 by anonymous

Why the speed of synchronous motor is constant?

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53 views 0 answers

asked Mar 3, 2018 by anonymous

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

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

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492 views 1 answer

asked Aug 6, 2017 by anonymous

what is the difference between synchronous and asynchronous motor?

Last 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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237 views 2 answers

asked Mar 18, 2018 by anonymous

Three phase synchronous motor will have how many sliprings?

Last answer: Three phase synchronous motor will have two sliprings.

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66 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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83 views 1 answer

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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77 views 1 answer

asked Mar 18, 2018 by anonymous

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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94 views 1 answer

asked Dec 31, 2017 by anonymous

The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

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

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119 views 2 answers

asked Sep 29, 2018 by anonymous

Discuss how power factor tariff results into energy conservation.

Last answer: Power factor tariff results into energy conservation: i) Applying incentives and penalties according to power factor is an effective way, which enables consumer to improve power factor so that he can ... finally leads to reduction in the current drawn by the load and helps for energy conservation.

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2.5k views 1 answer

asked Mar 10, 2018 by anonymous

How do you measure power factor?

Last answer: P= 1.83*V*I*COS@ where P is power V is voltage I is current COS @ is P.F COS@= P/(1.83*V*I) in other way cos @ = true power/apparent power

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66 views 1 answer

asked Mar 21, 2018 by anonymous

The power factor of a single phase load can be calculated if the instruments available are?

Last answer: The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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133 views 2 answers

asked Mar 10, 2018 by anonymous

Can you have a power factor greater than 1?

Last answer: We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current.

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103 views 1 answer

asked Apr 28, 2018 by anonymous

The armature reaction in a synchronous generator supplying leading power factor load is

The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing

Last answer: The armature reaction in a synchronous generator supplying leading power factor load is magnetizing and cross-magnetizing

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48 views 1 answer

asked May 7, 2020 by anonymous

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

Last 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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65 views 1 answer

asked May 7, 2020 by anonymous

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

Last 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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156 views 1 answer

How can we improve power factor using synchronous motor?

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