What Is Power Factor? Whether It Should Be High Or Low? Why?

What Is Power Factor? Whether It Should Be High Or Low? Why?
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1 Answer

Answer :

Power factor should be high in order to get smooth operation of the system.Low power factor me losses will be more.it is the ratio of true power to apparent power. it has to be ideally @if it is too low then cable over heating & equipment overloading will occur.

if it is greater than 1 then load will act as capacitor and starts feeding the source and will cause tripping.(if pf is poor ex: 0.17 to meet actual power load has to draw more current(V constant),result in more losses if pf is good.

ex: 0.95 to meet actual power load has to draw less current(V constant),result in less losses).
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Related questions

what is power factor? whether it should be high or low? why?

Description : what is power factor? whether it should be high or low? why?

Last Answer : A:Power factor is the ratio of true power to apparent power. It has to be ideally 1. If it is too low then cable over heating & equipment overloading will occur. if it is greater than 1 then load will ... : 0.95 to meet actual power, load has to draw less current(V constant),result in less losses).

A current carrying conductor making an electrical contact with a wiring metal conduit is indicated by a _____________. A. low switchboard wattmeter reading B. reading of 1.0 on the power factor meter C. high switchboard voltmeter reading D. totally darkened switchboard ground-detecting light

Description : A current carrying conductor making an electrical contact with a wiring metal conduit is indicated by a _____________. A. low switchboard wattmeter reading B. reading of 1.0 on the power factor meter C. high switchboard voltmeter reading D. totally darkened switchboard ground-detecting light

Last Answer : Answer: D

The 'reset' contacts of the master switch shown in the illustration provides the winch controller with ___________. EL-0102 A. low voltage release B. overload protection C. low voltage protection D. high power factor correction

Description : The 'reset' contacts of the master switch shown in the illustration provides the winch controller with ___________. EL-0102 A. low voltage release B. overload protection C. low voltage protection D. high power factor correction

Last Answer : Answer: C

In an alternating current electrical system, a low system power factor is a direct sign of _____________. A. wasted energy B. efficient operation C. a short in the exciter field windings D. an excessive number of minor system grounds

Description : In an alternating current electrical system, a low system power factor is a direct sign of _____________. A. wasted energy B. efficient operation C. a short in the exciter field windings D. an excessive number of minor system grounds

Last Answer : Answer: A

The operator of electrical motors should keep a constant check on the loads they carry because _____________. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens useful life C. energy is wasted if full loading is not utilized D. power factor correction methods are load dependent

Description : The operator of electrical motors should keep a constant check on the loads they carry because _____________. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens ... wasted if full loading is not utilized D. power factor correction methods are load dependent

Last Answer : Answer: B

During No load why the power factor of the transformer is very low ?

Description : During No load why the power factor of the transformer is very low ?

Last Answer : Current flowing through the transformer consists of two components. Magnetizing current (Im) which is in quadrature (90 0 ) to the applied voltage and in phase current which is in phase to the applied voltage ... power factor of transformer during no load condition will by in the order of 0.1 to 0.2

During No load why the power factor of the transformer is very low ?

Description : During No load why the power factor of the transformer is very low ?

Last Answer : A. Current flowing through the transformer consists of two components. Magnetizing current (Im) which is in quadrature (900) to the applied voltage and in phase current which is in phase to the applied voltage ... factor of transformer during no load condition will by in the order of 0.1 to 0.2

why single-phase induction motor has low power factor?

Description : why single-phase induction motor has low power factor?

Last Answer : The current through the running winding lags behind the supply voltage by a very large angle. Therefore power factor is very low.

What are the causes of low power factor?

Description : What are the causes of low power factor?

Last Answer : The following are the causes of low power factor otors are of induction type which have low lagging power factor. These motors work at a power factor which is extremely small on light load 0 ... KW of all electrical devices installed at the consumer's premises and connected to the supply system.

Mention the disadvantages of low power factor? How can it be improved?

Description : Mention the disadvantages of low power factor? How can it be improved?

Last Answer : Disadvantages of low power factor: Line losses are 1.57 times unity power factor. Larger generators and transformers are required. Low lagging power factor causes a large voltage drop, hence ... will have to carry more current at low power factor. This requires a large conductor size.

The power factor of a squirrel cage induction motor is (A) low at light load only. (B) low at heavy load only. (C) low at light and heavy load both. (D) low at rated load only.

Description : The power factor of a squirrel cage induction motor is (A) low at light load only. (B) low at heavy load only. (C) low at light and heavy load both. (D) low at rated load only.

Last Answer : (A) low at light load only.

A three-phase, squirrel cage, induction motor will run hot due to a/an ______________. A. improper brush position B. reversed commutating pole C. shorted stator D. high power factor

Description : A three-phase, squirrel cage, induction motor will run hot due to a/an ______________. A. improper brush position B. reversed commutating pole C. shorted stator D. high power factor

Last Answer : Answer: C

A three-phase, squirrel cage, induction motor will run hot due to _____________. A. open stator coils B. high power factor C. dirty or corroded slip rings D. reversed commutating poles

Description : A three-phase, squirrel cage, induction motor will run hot due to _____________. A. open stator coils B. high power factor C. dirty or corroded slip rings D. reversed commutating poles

Last Answer : Answer: A

The true power indicated by a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the _____________. A. power factor of the load B. angle of coil displacement C. inertia of the movable coil D. high resistance from the load

Description : The true power indicated by a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the _____________. A. power factor of the load B. angle of coil displacement C. inertia of the movable coil D. high resistance from the load

Last Answer : Answer: A

The true power indicated by the pointer movement of a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the ____________. A. power factor of the load B. angle of coil displacement C. inertia of the movable coil D. high resistance from the load

Description : The true power indicated by the pointer movement of a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the ____________. A. power factor of the ... B. angle of coil displacement C. inertia of the movable coil D. high resistance from the load

Last Answer : Answer: A

When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates ____________. A. good insulation B. bad insulation C. high insulation power factor D. a high slot discharge factor

Description : When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates ____________. A. good insulation B. bad insulation C. high insulation power factor D. a high slot discharge factor

Last Answer : Answer: B

Which power plant has high load factor?

Description : Which power plant has high load factor?

Last Answer : Answer:All base load power plants have a high load factor. If we use high efficiency power plants to supply the base load,we can reduce the cost of generation.Hydel power plants have a higher efficiency than thermal & nuclear power plants.

An important factor in reducing D.C. motor commutator wear is _______________. A. keeping the ambient humidity as low as possible B. ensuring a very low brush current density C. establishing the copper oxide surface film D. all of the above

Description : An important factor in reducing D.C. motor commutator wear is _______________. A. keeping the ambient humidity as low as possible B. ensuring a very low brush current density C. establishing the copper oxide surface film D. all of the above

Last Answer : Answer: C

What is in a particular place , whether high or low ?

Description : What is in a particular place , whether high or low ?

Last Answer : The answer is the road.

In order to determine whether or not 'fuse 2' shown in the illustration is defective, you should connect the voltage tester leads across points _____________. EL-0062 A. AC B. AD C. BC D. BD

Description : In order to determine whether or not 'fuse 2' shown in the illustration is defective, you should connect the voltage tester leads across points _____________. EL-0062 A. AC B. AD C. BC D. BD

Last Answer : Answer: B

In order to determine whether or not 'Fuse 1', shown in the illustration is defective, you should connect the voltage tester leads across points _____________. EL-0062 A. AC B. AD C. BC D. BD

Description : In order to determine whether or not 'Fuse 1', shown in the illustration is defective, you should connect the voltage tester leads across points _____________. EL-0062 A. AC B. AD C. BC D. BD

Last Answer : Answer: C

If all of the ground detection lamps burn with equal brilliance, whether the test button is depressed or released, then ___________. A. no grounds exist B. all phases are grounded C. all lamps show a ground D. all of the above

Description : If all of the ground detection lamps burn with equal brilliance, whether the test button is depressed or released, then ___________. A. no grounds exist B. all phases are grounded C. all lamps show a ground D. all of the above

Last Answer : Answer: A

Vessel pitch can be controlled by either the 'bridge or engine room thrust lever' shown in the illustration; but only with one engine on the line whether in 'cruise or maneuver' mode. The cause is most likely a faulty relay _____________. EL-0095 A. #1 B. #2 C. #3 D. #4

Description : Vessel pitch can be controlled by either the 'bridge or engine room thrust lever' shown in the illustration; but only with one engine on the line whether in 'cruise or maneuver' mode. The cause is most likely a faulty relay _____________. EL-0095 A. #1 B. #2 C. #3 D. #4

Last Answer : Answer: D

The insulation resistance of electric equipment and machinery should be tested for the lowest normal insulation values _____________. A. immediately after shutting down the machine B. every time the brush rigging is adjusted C. immediately after starting up the machine D. every 30 days whether the machine is in use or not

Description : The insulation resistance of electric equipment and machinery should be tested for the lowest normal insulation values _____________. A. immediately after shutting down the machine B. every time the brush rigging is ... starting up the machine D. every 30 days whether the machine is in use or not

Last Answer : Answer: A

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Description : Which is better, whether a) Phase segregated bus duct or b) Common bus duct?

Last Answer : Phase segregated bus duct is better, since phase to phase faults are avoided.  

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Description : Where fault level is more, whether in generator bus duct or UT bus duct? Why?

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Use the Factor Theorem to determine whether g(x) is a factor of p(x) in each of the following cases: (i) p(x) = 2x3+x2–2x–1, g(x) = x+1 -Maths 9th

Description : Use the Factor Theorem to determine whether g(x) is a factor of p(x) in each of the following cases: (i) p(x) = 2x3+x2–2x–1, g(x) = x+1 -Maths 9th

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3. Check whether 7+3x is a factor of 3x3+7x. -Maths 9th

Description : 3. Check whether 7+3x is a factor of 3x3+7x. -Maths 9th

Last Answer : Solution: 7+3x = 0 ⇒ 3x = −7 ⇒ x = -7/3 ∴Remainder: 3(-7/3)3+7(-7/3) = -(343/9)+(-49/3) = (-343-(49)3)/9 = (-343-147)/9 = -490/9 ≠ 0 ∴7+3x is not a factor of 3x3+7x

What is the factor that determines whether a product is classified as a consumer product or an industrial product?

Description : What is the factor that determines whether a product is classified as a consumer product or an industrial product?

Last Answer : Need answer

What factor determine whether a molecule can cross a cell membrane?

Description : What factor determine whether a molecule can cross a cell membrane?

Last Answer : What is the answer ?

What is a perception check? a) a cognitive bias that makes us listen only to information we already agree with b) a method teachers use to reward good listeners in the classroom c) any factor that gets in the way of good listening and decreases our ability to interpret correctly d) a response that allows you to state your interpretation and ask your partner whether or not that interpretation is correct

Description : What is a perception check? a) a cognitive bias that makes us listen only to information we already agree with b) a method teachers use to reward good listeners in the classroom c) ... that allows you to state your interpretation and ask your partner whether or not that interpretation is correct

Last Answer : d) a response that allows you to state your interpretation and ask your partner whether or not that interpretation is correct

The factor that distinguishes an error from an irregularity is a. Whether it is peso amount or a process. b. Whether it is a caused by the auditor or the client. c. Materiality. d. Intent.

Description : The factor that distinguishes an error from an irregularity is a. Whether it is peso amount or a process. b. Whether it is a caused by the auditor or the client. c. Materiality. d. Intent.

Last Answer : Intent.

The factor that distinguishes an error from fraud is a. Materiality. b. Intentc. Whether it is peso amount or a process. d. Whether it is a caused by the auditor or the client.

Description : The factor that distinguishes an error from fraud is a. Materiality. b. Intent. c. Whether it is peso amount or a process. d. Whether it is a caused by the auditor or the client

Last Answer : Intent

The primary factor that distinguishes errors from fraud is a. Whether the misstatement is perpetrated by an employee or by a member of management b. Whether the underlying cause of misstatement is intentional or unintentional. c. Whether the misstatement is concealed. d. Whether the underlying cause of misstatement relates to misapplication of accounting principles or to clerical processing

Description : The primary factor that distinguishes errors from fraud is a. Whether the misstatement is perpetrated by an employee or by a member of management b. Whether the underlying cause of ... the underlying cause of misstatement relates to misapplication of accounting principles or to clerical processing

Last Answer : Whether the underlying cause of misstatement is intentional or unintentional.

What factor determines whether a radio wave is reflected or refracted by the ionosphere?

Description : What factor determines whether a radio wave is reflected or refracted by the ionosphere?

Last Answer : Thickness of ionized layer.

What is the determining factor in classifying whether a radio wave is a ground wave or a space wave?

Description : What is the determining factor in classifying whether a radio wave is a ground wave or a space wave?

Last Answer : Whether the component of the wave is travelling along the surface or over the surface of the earth.

There is a debate as to whether teaching is a true profession or not. The most critical factor needed to make teaching a true profession is (a) Discipline of its own members. (b) A longer period of training (c) Better spiritus among teachers (d) A longer period of learning

Description : There is a debate as to whether teaching is a true profession or not. The most critical factor needed to make teaching a true profession is (a) Discipline of its own members. (b) A longer period of training (c) Better spiritus among teachers (d) A longer period of learning

Last Answer : (a) Discipline of its own members.

The main factor controlling a decision to increase the occlusal height of teeth for extensive oral reconstruction is whether, A. the inter occlusal distance will be physiologically acceptable after treatment B. there will be sufficient tooth bulk in the abutment teeth for proper retention of the crowns C. at least two third of the original alveolar process will remain for adequate periodontal support D. the aesthetic appearance of the patient will improve sufficiently to warrant the planned reconstruction

Description : The main factor controlling a decision to increase the occlusal height of teeth for extensive oral reconstruction is whether, A. the inter occlusal distance will be physiologically ... the aesthetic appearance of the patient will improve sufficiently to warrant the planned reconstruction

Last Answer : A. the inter occlusal distance will be physiologically acceptable after treatment

The main factor controlling a decision to increase the occlusal height of teeth for extensive oral reconstruction is whether, A. The inter occlusal distance will be physiologically acceptable after treatment B. There will be sufficient tooth bulk in the abutment teeth for proper retention of the crowns C. At least two third of the original alveolar process will remain for adequate periodontal support D. The aesthetic appearance of the patient will improve sufficiently to warrant the planned reconstruction

Description : The main factor controlling a decision to increase the occlusal height of teeth for extensive oral reconstruction is whether, A. The inter occlusal distance will be physiologically ... . The aesthetic appearance of the patient will improve sufficiently to warrant the planned reconstruction

Last Answer : A. The inter occlusal distance will be physiologically acceptable after treatment

Which of the following is NOT a factor used to classify wholesalers? A)Whether the wholesaler is owned by the producer B)Whether the wholesaler takes title to the products it handles C)The range of services offered by the wholesaler D)The price range of the products carried by the wholesaler E)The breadth and depth of the product lines carried by the wholesaler

Description : Which of the following is NOT a factor used to classify wholesalers? A)Whether the wholesaler is owned by the producer B)Whether the wholesaler takes title to the products it handles C)The ... products carried by the wholesaler E)The breadth and depth of the product lines carried by the wholesaler

Last Answer : D)The price range of the products carried by the wholesale

A saturable reactor uses relatively small DC currents to control _______________. A. high frequency low power loads B. low frequency low power loads C. high frequency high power loads D. low frequency high power loads

Description : A saturable reactor uses relatively small DC currents to control _______________. A. high frequency low power loads B. low frequency low power loads C. high frequency high power loads D. low frequency high power loads

Last Answer : Answer: D

The purpose of a motor undervoltage protection device is to _____________. A. prevent high armature current when power is restored B. start the motor at a very low voltage C. trip the load off the motor in case of fire D. protect personnel from low voltage shocks

Description : The purpose of a motor undervoltage protection device is to _____________. A. prevent high armature current when power is restored B. start the motor at a very low voltage C. trip the load off the motor in case of fire D. protect personnel from low voltage shocks

Last Answer : Answer: A

The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C)

Description : The line trap unit employed in carrier current relaying: (A) offers high impedance to 50 Hz power frequency signal (B) offers high impedance to carrier frequency signal (C) offers low impedance to carrier frequency signal (D) Both (A) & (C)

Last Answer : Ans: B The line trap unit employed in carrier current relaying offers high impedance to carrier frequency signal. Because carrier frequency range is 35 km – 500 kHz XL = 2Π f l Where f increases XL will also increases

In induction motors, the length of air gap in kept as small as mechanically possible is order to have (a) low power factor (b) high power factor (c) high over load capacity (d) any of the above

Description : In induction motors, the length of air gap in kept as small as mechanically possible is order to have (a) low power factor (b) high power factor (c) high over load capacity (d) any of the above

Last Answer : (b) high power factor

Transmission efficiency of transmission line increases with the: a) Decrease in power factor and voltage b) Increases in power factor and voltage c) Increase in power factor and decrease in voltage d) Increase in the voltage but decrease in the power factor

Description : Transmission efficiency of transmission line increases with the: a) Decrease in power factor and voltage b) Increases in power factor and voltage c) Increase in power factor and decrease in voltage d) Increase in the voltage but decrease in the power factor

Last Answer : Ans: B

When is the Ferranti effect on long over head lines experienced? a) The lines are lightly loaded b) The lines are heavily loaded c) The lines are fully loaded d) The power factor is unity

Description : When is the Ferranti effect on long over head lines experienced? a) The lines are lightly loaded b) The lines are heavily loaded c) The lines are fully loaded d) The power factor is unity

Last Answer : Ans: A