What is the purpose of POLARIZATION INDEX (PI) value?

What is the purpose of POLARIZATION INDEX (PI) value?
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Answer :

It is used to assess the degree of dryness of windings. It depends on free ions in insulating material. Initially for a new insulator free ions are less and hence more resistance will be more. For old insulation initially free ions will be more depends on age and material and hence resistance will be less. So the PI value for new insulation will be more and for old insulation it will be less. 
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Related questions

What is the Polarization index value? (Pi value) and simple definition of polarization index?

Description : What is the Polarization index value? (Pi value) and simple definition of polarization index?

Last Answer : Its ratio between insulation resistance (IR) i.e. meggar values for 10min to insulation resistance for 1 min. It ranges from 5-7 for new motors & normally for motor to be in good condition it should be Greater than 2.5.

What is the Polarization index value?

Description : What is the Polarization index value?

Last Answer : Its ratio between insulation resistance (IR)i.e meager value for 10min to insulation resistance for 1 min. It ranges from 5-7 for new motors & normally for motor to be in good condition it should be Greater than 2.5 .

When operating under a single-period capital-rationing constraint, you may first want to try selecting projects by descending order of their in order to give yourself the best chance to select the mix of projects that adds most to firm value. A. profitability index (PI) B. net present value (NPV) C. internal rate of return (IRR) D. payback period (PBP)

Description : When operating under a single-period capital-rationing constraint, you may first want to try selecting projects by descending order of their in order to give yourself the best chance to select the mix of ... net present value (NPV) C. internal rate of return (IRR) D. payback period (PBP)

Last Answer : B. net present value (NPV)

When operating under a single-period capital-rationing constraint, you may first want to try selecting projects by descending order of their in order to give yourself the best chance to select the mix of projects that adds most to firm value. A. profitability index (PI) B. net present value (NPV) C. internal rate of return (IRR) D. payback period (PBP)

Description : When operating under a single-period capital-rationing constraint, you may first want to try selecting projects by descending order of their in order to give yourself the best chance to select the mix of ... net present value (NPV) C. internal rate of return (IRR) D. payback period (PBP)

Last Answer : B. net present value (NPV)

A profitability index (PI) of .92 for a project means that . A. The project's costs (cash outlay) are (is) less than the present value of the project's benefits B. The project's NPV is greater than zero C. The project's NPV is greater than 1 D. The project returns 92 cents in present value for each current rupee invested (cost)

Description : A profitability index (PI) of .92 for a project means that . A. The project's costs (cash outlay) are (is) less than the present value of the project's benefits B. The project's NPV is ... is greater than 1 D. The project returns 92 cents in present value for each current rupee invested (cost)

Last Answer : C. The project's NPV is greater than 1

What is the PI value required for motors?

Description : What is the PI value required for motors?

Last Answer : For class F insulation >2 and for class B insulation 1.5 to 2. 

What is IR and PI value? Why it is measured?

Description : What is IR and PI value? Why it is measured?

Last Answer : IR It is the ratio of the DC voltage applied between the terminals and ground to the resultant current. When the DC voltage applied three components flow, a) A charging component flows ... Index). PI value detects relative condition of insulation with respect to moisture and other contaminants.

What is polarization? What is local action?

Description : What is polarization? What is local action?

Last Answer : Polarization : The hydrogen bubbles which are clinging over the surface of copper electrode (anode) becomes a thin film of hydrogen over the copper electrode. This hydrogen film increases the internal resistance ... always opposite to the main emf. The action of these cells is known as local action.

The criteria for acceptance of a project on the basis of Profitability Index (PI) is A.PI=0B. PI > 0 C. PI < 0 D. PI > 1

Description : The criteria for acceptance of a project on the basis of Profitability Index (PI) is   A.PI=0 B. PI > 0   C. PI < 0   D. PI > 1

Last Answer : D. PI > 1

According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is (A) 0 < PI < 7 (B) 7< PI < 17 (C) 17 < PI <27 (D) PI > 27

Description : According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is (A) 0 < PI < 7 (B) 7< PI < 17 (C) 17 < PI 27

Last Answer : (B) 7< PI < 17

PI Controllers in Process System

Description : PI Controllers in Process System

Last Answer : PI controllers are used in many industrial control applications. The main purpose of using Proportional and Integral (PI) in process system is to improve the steady state accuracy of the ... requires higher values of the proportional and integral gains compared to gains required in PI controllers

What are the minimum recommended PI values for AC and DC rotating machines?

Description : What are the minimum recommended PI values for AC and DC rotating machines? 

Last Answer : Following minimum recommended PI values criteria is to be followed. a. 1.5 for class – A insulation. b. 2.0 for class – B insulation. c. 2.5 for class – F insulation. 

What would happen if we find the full value of Pi?

Description : What would happen if we find the full value of Pi?

Last Answer : answer:First, I don't think that we'll ever find the full value' - I think it's been proven to 1.24 trillion digits that it is in fact an irrational number. So I believe that your premise ... as to be undetectable. It might be interesting from a science journalism point of view, but that's all.

Without looking it up, to how many digits after the decimal point can you recite for the value of Pi?

Description : Without looking it up, to how many digits after the decimal point can you recite for the value of Pi?

Last Answer : Those long winter nights must just fly by.

Find the decimal expansion of 7/22 .Explain why it is taken as the approximate value of pi -Maths 9th

Description : Find the decimal expansion of 7/22 .Explain why it is taken as the approximate value of pi -Maths 9th

Last Answer : 3.1564267467648582474747477647908765434567896542345678765431222245775583585.................................. or 22/7 is the value f pi

Find the decimal expansion of 7/22 .Explain why it is taken as the approximate value of pi -Maths 9th

Description : Find the decimal expansion of 7/22 .Explain why it is taken as the approximate value of pi -Maths 9th

Last Answer : 3.1564267467648582474747477647908765434567896542345678765431222245775583585.................................. or 22/7 is the value f pi

What is the value of pi? -Maths 9th

Description : What is the value of pi? -Maths 9th

Last Answer : 22/7 or 3.14 is the value of PI.

How was the value of PI calculated?

Description : How did it come out 3.14 with what action was this calculated?

Last Answer : Google - Nah should have searched: /

If `2cosec theta - cos theta cot theta >= k AA theta in (0,pi),` then value of `k` is

Description : If `2cosec theta - cos theta cot theta >= k AA theta in (0,pi),` then value of `k` is

Last Answer : If `2cosec theta - cos theta cot theta >= k AA theta in (0,pi),` then value of `k` is

If `hat(a), hat(b) and hat(c)` are unit vector inclined to each other at an angle of `pi/3` then the absolute value of `[hat(a)+hat(b) hat(b)+hat(c) h

Description : If `hat(a), hat(b) and hat(c)` are unit vector inclined to each other at an angle of `pi/3` then the absolute value of `[hat(a)+hat(b) hat(b)+hat(c) h

Last Answer : If `hat(a), hat(b) and hat(c)` are unit vector inclined to each other at an angle of `pi/3` then the ... A. `sqrt2` B. `sqrt3` C. `3sqrt2` D. `2sqrt3`

The value of definite integral `int_(-pi)^(pi) (cos 2x. cos2^(2)x.cos2^(3)x.cos 2^(4)x.cos2^(5)x)dx` is

Description : The value of definite integral `int_(-pi)^(pi) (cos 2x. cos2^(2)x.cos2^(3)x.cos 2^(4)x.cos2^(5)x)dx` is

Last Answer : The value of definite integral `int_(-pi)^(pi) (cos 2x. cos2^(2)x.cos2^(3)x.cos 2^(4)x.cos2^(5)x)dx` is A. 1 B. `-1` C. 0 D. 2

Q. The value of is equal `sum_(k=1)^13(1/(sin(pi/4+(k-1)pi/6)sin(pi/4+k pi/6))` is equal

Description : Q. The value of is equal `sum_(k=1)^13(1/(sin(pi/4+(k-1)pi/6)sin(pi/4+k pi/6))` is equal

Last Answer : Q. The value of is equal `sum_(k=1)^13(1/(sin(pi/4+(k-1)pi/6)sin(pi/4+k pi/6))` is equal A. `3-sqrt(3)` ... (3))` C. `2(sqrt(3)-1)` D. `2(2+sqrt(3))`

The positive integer value of `n gt 3` satisfying the equation `(1)/(sin((pi)/(n)))=(1)/(sin((2pi)/(n)))+(1)/(sin((3pi)/(n)))` is

Description : The positive integer value of `n gt 3` satisfying the equation `(1)/(sin((pi)/(n)))=(1)/(sin((2pi)/(n)))+(1)/(sin((3pi)/(n)))` is

Last Answer : The positive integer value of `n gt 3` satisfying the equation `(1)/(sin((pi)/(n)))=(1)/(sin((2pi)/(n)))+(1)/(sin((3pi)/(n)))` is

If the arithmetic mean of the roots of the equation `4cos^(3)x-4cos^(2)x-cos(pi+x)-1=0` in the interval `[0,315]` is equal to `kpi`, then the value of

Description : If the arithmetic mean of the roots of the equation `4cos^(3)x-4cos^(2)x-cos(pi+x)-1=0` in the interval `[0,315]` is equal to `kpi`, then the value of

Last Answer : If the arithmetic mean of the roots of the equation `4cos^(3)x-4cos^(2)x-cos(pi+x)-1=0` in the interval `[0,315 ... is A. `10` B. `20` C. `50` D. `80`

The ratio of the distance moved by a compound to the distance moved by the solvent frent is known as its (A) PI value (B) Linking number (C) Rf value (D) Gold number

Description : The ratio of the distance moved by a compound to the distance moved by the solvent frent is known as its (A) PI value (B) Linking number (C) Rf value (D) Gold number

Last Answer : Answer : C

To two decimal places, what is the value of Pi?

Description : To two decimal places, what is the value of Pi?

Last Answer : 3.14

There are three processes P1, P2 and P3 sharing a semaphore for synchronising a variable. Initial value of semaphore is one. Assume that negative value of semaphore tells us how many processes are waiting in queue. Processes access the semaphore in following order: (a) P2 needs to access (b) P1 needs to access (c) P3 needs to access (d) P2 exits critical section (e) Pi exits critical section The final value of semaphore will be: (1) 0 (2) 1 (3) -1 (4) -2

Description : There are three processes P1, P2 and P3 sharing a semaphore for synchronising a variable. Initial value of semaphore is one. Assume that negative value of semaphore tells us how many processes are waiting in queue. Processes access ... The final value of semaphore will be: (1) 0 (2) 1 (3) -1 (4) -2 

Last Answer : Answer: 1

how do polarization and opinion shift generally work in a decision-making group? -General Knowledge

Description : how do polarization and opinion shift generally work in a decision-making group? -General Knowledge

Last Answer : They depend on the predispositions of the members. -is how polarization and opinion shift generally work in a decision-making group.

Who in 1808 discovered polarization of light and introduced the term ‘Polarization’?

Description : Who in 1808 discovered polarization of light and introduced the term ‘Polarization’?

Last Answer : Answer: Etienne-Louis Malus.

What is polarization ?

Last Answer : Polarization is the division into two opposite or opposing groups or camps.

Polarization of electrons in acrolein may be written as:

Description : Polarization of electrons in acrolein may be written as:

Last Answer : Polarization of electrons in acrolein may be written as: A. `H_(2)overset(delta+)"C"=CH-CH=overset( ... (2)overset(delta-)C=CH-CH=overset(delta+)O`

Polarization of electrons in acrolein may be written as:

Description : Polarization of electrons in acrolein may be written as:

Last Answer : Polarization of electrons in acrolein may be written as: A. `H_(2)overset(delta+)"C"=CH-CH=overset( ... (2)overset(delta-)C=CH-CH=overset(delta+)O`

Is it true that charges do not transfer between objects in polarization or conduction?

Description : Is it true that charges do not transfer between objects in polarization or conduction?

Last Answer : Need answer

How did the KKK contribute to the polarization and sectional alignment of political parties in the late nineteenth century?

Description : How did the KKK contribute to the polarization and sectional alignment of political parties in the late nineteenth century?

Last Answer : What is the answer ?

The information of brilliant colors in a thin soap film is a consequence of the phenomena of - (1) Polarization and interference (2) Diffraction and dispersion (3) Multiple refraction and dispersion (4) Multiple reflection and interference

Description : The information of brilliant colors in a thin soap film is a consequence of the phenomena of - (1) Polarization and interference (2) Diffraction and dispersion (3) Multiple refraction and dispersion (4) Multiple reflection and interference

Last Answer : (4) Multiple reflection and interference Explanation: Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.

The information of brilliant colors in a thin soap film is a consequence of the phenomena of - (1) Polarization and interference (2) Diffraction and dispersion (3) Multiple refraction and dispersion (4) Multiple reflection and interference

Description : The information of brilliant colors in a thin soap film is a consequence of the phenomena of - (1) Polarization and interference (2) Diffraction and dispersion (3) Multiple refraction and dispersion (4) Multiple reflection and interference

Last Answer : (4) Multiple reflection and interference Explanation: Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.

Which of the following supports particle nature of photons? (1) Diffraction (2) Polarization (3) Photoelectric effect (4) Interference

Description : Which of the following supports particle nature of photons? (1) Diffraction (2) Polarization (3) Photoelectric effect (4) Interference

Last Answer : (3) Photoelectric effect

Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarization

Description : Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarization

Last Answer : (1) Reflection Explanation: Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the ... reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.

Which of the following phenomenon helps to conclude that light is a transverse wave? (1) interference (2) diffraction (3) polarization (4) refraction

Description : Which of the following phenomenon helps to conclude that light is a transverse wave? (1) interference (2) diffraction (3) polarization (4) refraction

Last Answer : (3) polarization Explanation: The phenomena of interference and diffraction of light were successful beyond doubt to prove that light is a form of wave. But they failed to decide whether light ... light is a transverse wave was established only after the discovery of the phenomenon of polarization.

Golden view of sea shell is due to - (1) Diffraction (2) Dispersion (3) Polarization (4) Reflection

Description : Golden view of sea shell is due to - (1) Diffraction (2) Dispersion (3) Polarization (4) Reflection

Last Answer : (3) Polarization Explanation: When a ray of light falls on sea shell, its small amount gets refracted (slightly polarized) and rest almost gets reflected back (fully polarized). So it gets a golden view because of polarization.

Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation? (1) Scattering (2) Diffraction (3) Interference (4) Polarization

Description : Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation? (1) Scattering (2) Diffraction (3) Interference (4) Polarization

Last Answer : (1) Scattering Explanation: Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.

On a rainy day, small oil films on water show brilliant colors. This is due to - (1) dispersion (2) interference (3) diffraction (4) polarization

Description : On a rainy day, small oil films on water show brilliant colors. This is due to - (1) dispersion (2) interference (3) diffraction (4) polarization

Last Answer : (2) interference Explanation: The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.

A thin oil film on a water surface appears coloured because of – (1) reflection (2) interference (3) diffraction (4) polarization

Description : A thin oil film on a water surface appears coloured because of – (1) reflection (2) interference (3) diffraction (4) polarization

Last Answer : (2) interference Explanation: A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface.

A pond of water appears less deep due to – (1) Reflection (2) Diffraction (3) Refraction (4) Polarization

Description : A pond of water appears less deep due to – (1) Reflection (2) Diffraction (3) Refraction (4) Polarization

Last Answer : (3) Refraction Explanation: The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light ... eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.

A soap bubble shows colours when illuminated with white light. This is due to – (1) Diffraction (2) Polarization (3) Interference (4) Reflection

Description : A soap bubble shows colours when illuminated with white light. This is due to – (1) Diffraction (2) Polarization (3) Interference (4) Reflection

Last Answer : (3) Interference Explanation: The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon ... are the same as the phenomenon causing the colours in an oil slick on a wet road.

Longitudinal waves do not exhibit a. Polarization b. Refraction c. Reflection d. Diffraction

Description : Longitudinal waves do not exhibit a. Polarization b. Refraction c. Reflection d. Diffraction

Last Answer : a. Polarization

The wavelength of light has no role in a. Diffraction b. Interference c. Polarization d. Reflection

Description : The wavelength of light has no role in a. Diffraction b. Interference c. Polarization d. Reflection

Last Answer : c. Polarization

______ polarization is employed in FM broadcasting A. Horizontal B. Vertical C. Circular D. Bidirectional

Description : ______ polarization is employed in FM broadcasting A. Horizontal B. Vertical C. Circular D. Bidirectional

Last Answer : A. Horizontal

_____ polarization is employed in AM broadcasting A. Horizontal B. Vertical C. Circular D. Omnidirectional

Description : _____ polarization is employed in AM broadcasting A. Horizontal B. Vertical C. Circular D. Omnidirectional

Last Answer : B. Vertical

When antennas are closed to the ground, _______ polarization is ideal A. horizontally polarized B. vertically polarized C. circularly polarized D. both A and B

Description : When antennas are closed to the ground, _______ polarization is ideal A. horizontally polarized B. vertically polarized C. circularly polarized D. both A and B

Last Answer : B. vertically polarized