Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
What is the best power factor?
Speak Question
asked
Mar 10, 2018
by
anonymous
What is the best power factor?
best
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
Speak Answer
answered
Mar 10, 2018
by
ss771980
It is unity power factor but difficult to achieve in dynamic loads
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Mar 10, 2018
by
anonymous
What is the use of power factor correction?
What is the use of power factor correction?
use
power
factor
correction
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
0
answers
asked
Mar 10, 2018
by
anonymous
What is the advantage of high power factor?
What is the advantage of high power factor?
Last answer:
Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill
advantage
high
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
2
answers
asked
Mar 10, 2018
by
anonymous
What is power factor angle?
What is power factor angle?
power
factor
angle
thumb_up_alt
0
like
thumb_down_alt
0
dislike
60
views
0
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
103
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
52
views
0
answers
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
68
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
184
views
0
answers
asked
Apr 29, 2018
by
anonymous
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
Last answer:
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
power
factor
single
phase
watt
meter
operating
thumb_up_alt
0
like
thumb_down_alt
0
dislike
136
views
1
answer
asked
Mar 19, 2018
by
anonymous
What is the maximum value of power factor?
What is the maximum value of power factor?
Last answer:
1 is the maximum value of power factor.
maximum
value
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
79
views
1
answer
asked
Mar 16, 2018
by
anonymous
What is the power factor of purely resistive circuit?
What is the power factor of purely resistive circuit.
Last answer:
Unity that is 1
power
factor
purely
resistive
circuit
thumb_up_alt
0
like
thumb_down_alt
0
dislike
179
views
2
answers
asked
Mar 10, 2018
by
anonymous
What is the best frequency response?
What is the best frequency response?
best
frequency
response
thumb_up_alt
0
like
thumb_down_alt
0
dislike
64
views
0
answers
asked
Apr 28, 2018
by
anonymous
The benefit of power factor correction in a power system is
The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile
Last answer:
The benefit of power factor correction in a power system is lower power consumption
benefit
power
factor
correction
system
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
1
answer
asked
Mar 25, 2018
by
anonymous
The power factor of a D.C. circuit is always?
The power factor of a D.C. circuit is always?
Last answer:
The power factor of a D.C. circuit is always unity.
power
factor
dc
circuit
thumb_up_alt
0
like
thumb_down_alt
0
dislike
144
views
1
answer
asked
Mar 25, 2018
by
anonymous
The ratio of active power to apparent power is known as____ factor.
The ratio of active power to apparent power is known as____ factor.
Last answer:
The ratio of active power to apparent power is known as power factor.
ratio
active
power
apparent
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
194
views
1
answer
asked
Mar 25, 2018
by
anonymous
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?
Last answer:
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.
ac
circuit
power
factor
lagging
thumb_up_alt
0
like
thumb_down_alt
0
dislike
313
views
1
answer
asked
Mar 25, 2018
by
anonymous
The power factor at resonance in R-L- C parallel circuit is?
The power factor at resonance in R-L- C parallel circuit is?
Last answer:
since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.
power
factor
resonance
rlc
parallel
circuit
thumb_up_alt
0
like
thumb_down_alt
0
dislike
233
views
2
answers
asked
Mar 25, 2018
by
anonymous
Power factor of the system is kept high?
Power factor of the system is kept high?
Last answer:
Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.
power
factor
system
high
thumb_up_alt
0
like
thumb_down_alt
0
dislike
91
views
1
answer
asked
Mar 21, 2018
by
anonymous
In a single phase power factor meter the phase difference between the currents in the two pressure coils is?
Last answer:
In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.
single
phase
power
factor
meter
difference
between
currents
thumb_up_alt
0
like
thumb_down_alt
0
dislike
160
views
1
answer
asked
Mar 21, 2018
by
anonymous
In a low power factor wattmeter the compensating coil is connected?
Last answer:
In a low power factor wattmeter the compensating coil is connected in series with pressure coil.
power
factor
wattmeter
compensating
coil
thumb_up_alt
0
like
thumb_down_alt
0
dislike
301
views
1
answer
asked
Mar 21, 2018
by
anonymous
In a low power factor wattmeter the pressure coil is connected?
Last answer:
In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.
low
power
factor
wattmeter
pressure
coil
thumb_up_alt
0
like
thumb_down_alt
0
dislike
150
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.
dc
series
motor
the
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
92
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.
power
factor
single-phase
induction
motor
usually
thumb_up_alt
0
like
thumb_down_alt
0
dislike
99
views
1
answer
asked
Mar 20, 2018
by
anonymous
For a consumer the most economical power factor is generally?
Last answer:
For a consumer the most economical power factor is generally 0.95 lagging .
consumer
economical
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
138
views
1
answer
asked
Mar 20, 2018
by
anonymous
The primary reason for low power factor is supply system is due to installation of?
Last answer:
The primary reason for low power factor is supply system is due to installation of induction motors.
primary
reason
low
power
factor
supply
system
installation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
85
views
1
answer
asked
Mar 20, 2018
by
anonymous
The power loss is an important factor for the design of?
Last answer:
The power loss is an important factor for the design of transmission line.
power
loss
important
factor
design
thumb_up_alt
0
like
thumb_down_alt
0
dislike
81
views
1
answer
asked
Mar 19, 2018
by
anonymous
Minimum voltage regulation occurs when the power factor of the load is?
Minimum voltage regulation occurs when the power factor of the load is?
Last answer:
Minimum voltage regulation occurs when the power factor of the load is leading.
minimum
voltage
regulation
power
factor
load
thumb_up_alt
0
like
thumb_down_alt
0
dislike
115
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
82
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?
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
159
views
1
answer
asked
Mar 8, 2018
by
anonymous
Why the power factor of semiconverter is better than full converter?
Why the power factor of semiconverter is better than full converter?
Last answer:
Power factor of semiconverter is better than full converter
power
factor
semiconverter
better
full
converter
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.7k
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
134
views
1
answer
asked
Apr 30, 2018
by
anonymous
A transformer has negative voltage regulation when its load power factor is
A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging
Last answer:
Leading
transformer
negative
voltage
regulation
load
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
1.1k
views
2
answers
asked
Mar 25, 2018
by
anonymous
Power factor of electric bulb is?
Power factor of electric bulb is?
Last answer:
Power factor of electric bulb is unity.
power
factor
electric
bulb
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
1
answer
asked
Mar 25, 2018
by
anonymous
Power factor of an inductive circuit is usually improved by connecting capacitor to it in?
Power factor of an inductive circuit is usually improved by connecting capacitor to it in?
Last answer:
Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.
power
factor
inductive
circuit
usually
improved
capacitor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
158
views
1
answer
asked
Mar 24, 2018
by
anonymous
Power factor of an electrical circuit is equal to?
Power factor of an electrical circuit is equal to?
Last answer:
Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.
power
factor
electrical
circuit
thumb_up_alt
0
like
thumb_down_alt
0
dislike
156
views
1
answer
asked
Mar 20, 2018
by
anonymous
Load factor of a power station is generally?
Last answer:
Load factor of a power station is generally less than unity.
load
factor
power
station
thumb_up_alt
0
like
thumb_down_alt
0
dislike
53
views
1
answer
asked
Mar 20, 2018
by
anonymous
Load factor of a power station is defined as?
Last answer:
Load factor of a power station is defined as average load/maximum demand.
load
factor
power
station
defined
thumb_up_alt
0
like
thumb_down_alt
0
dislike
88
views
1
answer
asked
Mar 18, 2018
by
anonymous
At which power factor alternator is said to be overexcited?
At which power factor alternator is said to be overexcited?
Last answer:
At leading power factor alternator is said to be overexcited.
power
factor
alternator
overexcited
thumb_up_alt
0
like
thumb_down_alt
0
dislike
64
views
1
answer
asked
May 22, 2020
by
anonymous
State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
Last answer:
i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor)
power
factor
short
transmission
lines
thumb_up_alt
0
like
thumb_down_alt
0
dislike
75
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
98
views
1
answer
asked
Sep 22, 2018
by
anonymous
State the incentives and penalties related with power factor tariff.
State the incentives and penalties related with power factor tariff.
Last answer:
Incentives and penalties related with power factor tariff: In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff) the tariff in which P.F. of ... industrial consumer/H.T/ commercial consumers with contract demand above 80 kw/ 100Kva/107 hp consumer.
incentives
penalties
power
factor
tariff
thumb_up_alt
0
like
thumb_down_alt
0
dislike
52
views
1
answer
asked
Sep 6, 2018
by
anonymous
State the significance of power factor.
State the significance of power factor.
Last answer:
Significance of power factor:- 1. Cosine of angle between voltage & current in a circuit is called power factor. 2. It is a measure of the real power in a circuit. 3. Inductive & ... KVA rating equipment 5. Greater conductor size 6. CosØ = R/Z CosØ= Active Power/ Apparent Power
significance
power
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
36
views
1
answer
asked
Apr 30, 2018
by
anonymous
The power factor of dielectric :
The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)
Last answer:
The power factor of dielectric : (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)
power
factor
dielectric
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
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
synchronous
power
factor
angle
thumb_up_alt
0
like
thumb_down_alt
0
dislike
50
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.
power
factor
single
phase
load
calculated
instruments
thumb_up_alt
0
like
thumb_down_alt
0
dislike
135
views
2
answers
asked
Mar 21, 2018
by
anonymous
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at?
Last answer:
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at 120°.
dynamometer
3-phase
power
factor
meter
thumb_up_alt
0
like
thumb_down_alt
0
dislike
80
views
1
answer
asked
Mar 21, 2018
by
anonymous
The two pressure coils of a single phase power factor meter have?
Last answer:
The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.
two
pressure
coils
single
phase
power
factor
meter
thumb_up_alt
0
like
thumb_down_alt
0
dislike
72
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.
standard
full-load
power
factor
ratings
synchronous
motors
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
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.
distribution
system
improve
power
factor
synchronous
capacitors
installed
thumb_up_alt
0
like
thumb_down_alt
0
dislike
104
views
1
answer
asked
Mar 20, 2018
by
anonymous
Power plant having maximum demand more than the installed rated capacity will have utilisation factor?
Last answer:
Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.
power
plant
maximum
demand
installed
rated
capacity
utilisation
factor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
1
answer
...