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How can we improve power factor using synchronous motor?
asked
Mar 15, 2018
by
anonymous
How can we improve power factor using synchronous motor?
improve
power
factor
synchronous
motor
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Related questions
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.
synchronous
condenser
improve
power
factor
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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.
distribution
system
improve
power
factor
synchronous
capacitors
installed
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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.
power
factor
synchronous
motor
leading
adjusting
excitation
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1
answer
asked
Dec 16, 2017
by
anonymous
How does a capacitor improve power factor?
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.
capacitor
improve
power
factor
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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.
synchronous
power
factor
equivalent
induction
motor
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1
answer
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.
load
normally
excited
synchronous
motor
increased
power
factor
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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?
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.
synchronous
motor
leading
power
factor
drive
mechanical
load
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1
answer
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.
field
synchronous
motor
excited
power
factor
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1
answer
asked
Aug 18, 2019
by
anonymous
Why capacitors are used to improve power factor?
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.
capacitors
improve
power
factor
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3
answers
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.
change
excitation
synchronous
machine
affect
power
factor
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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
synchronous
generator
lagging
power
factor
load
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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
synchronous
power
factor
angle
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1
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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
maximum
reluctance
power
salient-pole
synchronous
motor
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71
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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.
standard
full-load
power
factor
ratings
synchronous
motors
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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.
power
factor
correction
synchronous
motors
operate
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1
answer
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.
time
power
factor
induction
motor
low
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133
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1
answer
asked
Mar 18, 2018
by
anonymous
How can we reverse the direction of rotation of synchronous motor?
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.
reverse
direction
rotation
synchronous
motor
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185
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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
synchronous
motor
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455
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2
answers
asked
Mar 18, 2018
by
anonymous
The synchronous motor will develop maximum power when the load angle is?
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.
synchronous
motor
develop
maximum
power
load
angle
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80
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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.
dc
series
motor
the
power
factor
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91
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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.
power
factor
single-phase
induction
motor
usually
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99
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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.
induction
motor
high
power
factor
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1
answer
asked
Mar 18, 2018
by
anonymous
Can we use the synchronous motor as the synchronous capacitor?
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.
use
synchronous
motor
capacitor
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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
factor
power
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0
answers
asked
May 17, 2020
by
anonymous
Briefly explain how the power factor of an inductive circuit can be improved.
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.
power
factor
electrical
fundamental
circuit
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95
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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.
change
excitation
synchronous
machine
affect
motor
speed
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68
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1
answer
asked
Mar 10, 2018
by
anonymous
Why do we need to correct power factor?
Why do we need to correct power factor?
need
correct
power
factor
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52
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0
answers
asked
May 8, 2018
by
anonymous
Damper winding in a synchronous motor
Damper winding in a synchronous motor
Last answer:
Damper winding in a synchronous motor Serves to start the motor.
damper
winding
synchronous
motor
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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
effect
load
synchronous
motor
running
normal
excitation
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399
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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.
reluctance
motor
synchronous
speed
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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.
centrifugal
switch
disconnects
auxiliary
winding
motor
synchronous
speed
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139
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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.
synchronous
speed
motor
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69
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1
answer
asked
Mar 15, 2018
by
anonymous
Why synchronous motor Cannot start itself?
Why synchronous motor Cannot start itself?
synchronous
motor
start
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58
views
0
answers
asked
Mar 15, 2018
by
anonymous
What is the principle of synchronous motor?
What is the principle of synchronous motor?
principle
synchronous
motor
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0
answers
asked
Mar 15, 2018
by
anonymous
What is the use of synchronous motor?
What is the use of synchronous motor?
use
synchronous
motor
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57
views
0
answers
asked
Mar 15, 2018
by
anonymous
Why the speed of synchronous motor is constant?
Why the speed of synchronous motor is constant?
speed
synchronous
motor
constant
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0
answers
asked
Mar 3, 2018
by
anonymous
In synchronous motor, does the winding losses vary with load?
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.
synchronous
motor
winding
losses
vary
load
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492
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1
answer
asked
Aug 6, 2017
by
anonymous
what is the difference between synchronous and asynchronous motor?
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.
synchronous
asynchronous
motor
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2
answers
asked
Mar 18, 2018
by
anonymous
Three phase synchronous motor will have how many sliprings?
Three phase synchronous motor will have how many sliprings?
Last answer:
Three phase synchronous motor will have two sliprings.
three
phase
synchronous
motor
slipring
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66
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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.
operating
speed
synchronous
motor
fixed
value
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83
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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.
synchronous
motor
develop
torque
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77
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1
answer
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.
synchronous
motor
made
self
starting
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94
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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 ?
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
induction
motor
synchronous
speed
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2
answers
asked
Sep 29, 2018
by
anonymous
Discuss how power factor tariff results into energy conservation.
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.
power
factor
tariff
energy
conservation
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answer
asked
Mar 10, 2018
by
anonymous
How do you measure power factor?
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
measure
power
factor
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66
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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.
power
factor
single
phase
load
calculated
instruments
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133
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2
answers
asked
Mar 10, 2018
by
anonymous
Can you have a power factor greater than 1?
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.
power
factor
greater
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103
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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
armature
reaction
synchronous
generator
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1
answer
asked
May 7, 2020
by
anonymous
List different starting methods of three phase synchronous motor. Explain any one of them.
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.
list
different
starting
methods
of
three
phase
synchronous
motor
explain
any
one
them
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1
answer
asked
May 7, 2020
by
anonymous
Draw and explain V and inverted V curves for synchronous motor.
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.
draw
and
explain
v
inverted
curves
for
synchronous
motor
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answer
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