What is the normal value of moisture content allowed in transformer oil?

What is the normal value of moisture content allowed in transformer oil? 
by

1 Answer

Answer :

<10 ppm.  
by

Related questions

67 The chemical used in breather for transformer should have the quality of A. Ionizing air B. Absorbing moisture C. Cleansing the transformer oil D. Cooling the transformer oil

Description : 67 The chemical used in breather for transformer should have the quality of A. Ionizing air B. Absorbing moisture C. Cleansing the transformer oil D. Cooling the transformer oil

Last Answer : B. Absorbing moisture

What is the effect of salt content in moisture on resistivity?

Description : What is the effect of salt content in moisture on resistivity?

Last Answer : The resistivity decreases and the salt content is expressed in percent by weight of the contained moisture. It will be noted that the curve flattens off at about 5% salt content and a further increase in salt content gives little decrease in the soil resistivity. 

What is the effect of moisture content on earth resistivity?

Description : What is the effect of moisture content on earth resistivity?

Last Answer : The moisture content is expressed in percent by weight of dry soil. Dry earth weights about 1440 kg per cubic meter and thus 10% moisture content is equivalent to 144 kg of water per cubic ... is very little affected. Below 20%, the resistivity increases very abruptly with the decrease in moisture.

Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction (A) Decreases with decrease of thickness of the flakes(B) Increases with the increasing flake size keeping the flake thicknessconstant(C) Increases considerably with the rise of temperature(D) Decreases as the moisture content of flakes increases

Description : Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction (A) Decreases with decrease of thickness of the flakes (B) Increases with the increasing flake size ... considerably with the rise of temperature (D) Decreases as the moisture content of flakes increases

Last Answer : (D) Decreases as the moisture content of flakes increases

What is the maximum current allowed to be drawn from the secondary of a 2 KVA step-down transformer with a turns ratio of four to one if connected across a 440 volt line? A. 1.1 amps B. 4.5 amps C. 18.1 amps D. 22.7 amps

Description : What is the maximum current allowed to be drawn from the secondary of a 2 KVA step-down transformer with a turns ratio of four to one if connected across a 440 volt line? A. 1.1 amps B. 4.5 amps C. 18.1 amps D. 22.7 amps

Last Answer : Answer: C

The main purpose of an electric space heater installed in a large AC generator is to _____________. A. keep the lube oil warm for quick starting B. prevent moisture from condensing in the windings when the machine is shutdown C. prevent the windings from becoming brittle D. prevent acidic pitting of the slip rings

Description : The main purpose of an electric space heater installed in a large AC generator is to _____________. A. keep the lube oil warm for quick starting B. prevent moisture from condensing in the ... is shutdown C. prevent the windings from becoming brittle D. prevent acidic pitting of the slip rings

Last Answer : Answer: B

The main purpose of an electric space heater installed in a large AC generator is to _____________. A. prevent the windings from becoming brittle B. prevent moisture from condensing in the windings during shutdown C. prevent acidic pitting of the slip rings D. keep the lube oil warm for quick starting

Description : The main purpose of an electric space heater installed in a large AC generator is to _____________. A. prevent the windings from becoming brittle B. prevent moisture from condensing in the windings during ... C. prevent acidic pitting of the slip rings D. keep the lube oil warm for quick starting

Last Answer : Answer: B

As the equilibrium moisture content of the coal increases, its (A) Calorific value increases (B) Swelling number decreases (C) Swelling number increases (D) Bulk density decreases

Description : As the equilibrium moisture content of the coal increases, its (A) Calorific value increases (B) Swelling number decreases (C) Swelling number increases (D) Bulk density decreases

Last Answer : (B) Swelling number decreases

With increase in moisture content of coal, its (A) Calorific value increases sometimes (B) Bulk density always decreases (C) Clinkering tendency during combustion increases (D) None of these

Description : With increase in moisture content of coal, its (A) Calorific value increases sometimes (B) Bulk density always decreases (C) Clinkering tendency during combustion increases (D) None of these

Last Answer : (D) None of these

With increase in moisture content of coal, its (A) Calorific value increases (B) Caking properties diminish (C) Swelling during carbonisation becomes excessive (D) None of these

Description : With increase in moisture content of coal, its (A) Calorific value increases (B) Caking properties diminish (C) Swelling during carbonisation becomes excessive (D) None of these

Last Answer : (B) Caking properties diminish

Pick out the correct statement. (A) Oxygen content decreases from lignite to bituminous coal as the coalification increases (B) The less the oxygen content, better is the coal, as it reduces the calorific value (C) With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases (D) All (A), (B) and (C)

Description : Pick out the correct statement. (A) Oxygen content decreases from lignite to bituminous coal as the coalification increases (B) The less the oxygen content, better is the coal, as it reduces the calorific value (C ... capacity of coal increases and the caking power decreases (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

The change of moisture content of soils, changes the (A) Value of the angle of repose (B) Amount of compaction required (C) Cohesive strength of soil (D) All the above

Description : The change of moisture content of soils, changes the (A) Value of the angle of repose (B) Amount of compaction required (C) Cohesive strength of soil (D) All the above

Last Answer : Answer: Option D

With increase in moisture content, the bulking of sand (A) Increases (B) Decreases (C) First increases to a certain maximum value and then decreases (D) First decreases to a certain minimum value and then increases

Description : With increase in moisture content, the bulking of sand (A) Increases (B) Decreases (C) First increases to a certain maximum value and then decreases (D) First decreases to a certain minimum value and then increases

Last Answer : Answer: Option C

A nickel-cadmium battery is receiving a normal charge and gases freely. The charging current should _____________. A. be increased B. be decreased C. be cut off and the battery allowed to cool D. remain the same

Description : A nickel-cadmium battery is receiving a normal charge and gases freely. The charging current should _____________. A. be increased B. be decreased C. be cut off and the battery allowed to cool D. remain the same

Last Answer : Answer: D

Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation ________. A. is good for long term preserving since most insulation is organic and contains some amount B. lowers the insulation value and is a common cause of fault grounds in idle machines C. will enhance insulation resistance only if it is fresh water and contains no salt D. reduces the amount of current supplied or drawn by the machine so horsepower is limited

Description : Moisture absorbed in the windings or condensed on the surface of electrical machinery insulation ________. A. is good for long term preserving since most insulation is organic and contains some amount B. ... D. reduces the amount of current supplied or drawn by the machine so horsepower is limited

Last Answer : Answer: B

Stones are provided in the substation to: a) To avoid fire accident by draining oil from transformer if leaks b) To avoid growing of weeds and plants c) To provide insulation d) All the above

Description : Stones are provided in the substation to: a) To avoid fire accident by draining oil from transformer if leaks b) To avoid growing of weeds and plants c) To provide insulation d) All the above

Last Answer : Ans: D

Figure 'B' shown in the illustration represents a/an ____________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

Description : Figure 'B' shown in the illustration represents a/an ____________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

Last Answer : Answer: A

Figure 'A' shown in the illustration represents a/an _______________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

Description : Figure 'A' shown in the illustration represents a/an _______________. EL-0091 A. magnetic amplifier B. Scott-T transformer C. saturable-core reactor D. oil-filled toroid

Last Answer : Answer: C

Which type of oil is used as a transformer oil?

Description : Which type of oil is used as a transformer oil?

Last Answer : Transformer oil, or insulating oil, is usually a highly-refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. It is used in oil filled ... life, readily biodegradable, and have a lower volatility and higher flash points than mineral oil.

What is the function of transformer oil?

Description : What is the function of transformer oil?

Last Answer : A. Transformer Oil serves mainly two purposes 1. It acts as liquid insulation in electrical power transformer 2. It dissipates heat of the transformer i.e acts as coolant. In addition to these ... acid (C7, C8) esters are also becoming increasingly common as alternatives to naphthenic mineral oil.

Why transformer oil is used as a cooling medium?

Description : Why transformer oil is used as a cooling medium?

Last Answer : When transformer oil is used as a coolant the heat dissipation by convection is 10 times more than the convection due to air. Hence transformer oil is used as a cooling medium.

What is the function of transformer oil in a transformer ?

Description : What is the function of transformer oil in a transformer ?

Last Answer : Transformer oil provides , (i)good insulation and (ii)cooling . Nowadays instead of natural mineral oil, synthetic oils known as ASKRELS (trade name ) are used. They are non-inflammable ... an electric arc do not decompose to produce inflammable gases. PYROCOLOR oil possess high dielectric strength.

What is oil immersed type transformer?

Description : What is oil immersed type transformer?

Last Answer : In this type of transformer, oil is used as coolant. Entire assembly including core and windings is kept immersed in oil. The developed heat is transferred to the walls of tank through oil. Finally the heat is transferred to the surrounding air from tank wall by radiation.

What are the types of oil used for in transformer for cooling?

Description : What are the types of oil used for in transformer for cooling? 

Last Answer : Paraffin based and naphtha based (in INDIA)  

Why there is no mixing of oil of tap changer and transformer?

Description : Why there is no mixing of oil of tap changer and transformer?

Last Answer : When the tap changing takes place arc is struck between the contacts. Due to this the oil inside the tap changer will be highly carbonised. If both oil get mixed up the quality of transformer tank oil will come down. This is not advisable. Hence both oils are kept separately. 

What is the requirement oil in a transformer?

Description : What is the requirement oil in a transformer?

Last Answer : Oil is used removal of heat produced in the transformer and also as insulating medium. 

Mention the properties of transformer oil.

Description : Mention the properties of transformer oil.

Last Answer : Properties of transformer oil are, a) Colour – pale yellow. b) Moisture content -

What is gap between the electrodes in transformer oil testing kit?

Description : What is gap between the electrodes in transformer oil testing kit?

Last Answer : 0.1 Inch.

An open coil in a transformer will be indicated by which of the listed conditions? A. 'zero' resistance accompanied by high inductance B. no resistance accompanied by stray inductance C. infinite resistance in addition to no inductance D. infinite resistance in addition to normal inductance

Description : An open coil in a transformer will be indicated by which of the listed conditions? A. 'zero' resistance accompanied by high inductance B. no resistance accompanied by stray inductance C. infinite resistance in addition to no inductance D. infinite resistance in addition to normal inductance

Last Answer : Answer: C

What is the difference between PT and normal transformer?

Description : What is the difference between PT and normal transformer?  

Last Answer : Burden of PT is less and burden of normal transformer is high.  

Material used inside the breather to prevent moisture entering the transformer is

Description : Material used inside the breather to prevent moisture entering the transformer is

Last Answer : Material used inside the breather to prevent moisture entering the transformer is silica gel

The arrow drawn through the component shown in the illustration means that the device's value _____________. EL-0015 A. is fixed and cannot be changed B. is variable between two limits C. has yet to be determined for the circuit application D. is not allowed to change during circuit operation

Description : The arrow drawn through the component shown in the illustration means that the device's value _____________. EL-0015 A. is fixed and cannot be changed B. is variable between two limits C. has yet to be determined for the circuit application D. is not allowed to change during circuit operation

Last Answer : Answer: B

Recipe help. What is the moisture content of white bread?

Description : Recipe help. What is the moisture content of white bread?

Last Answer : I would make the determination based on what you are doing with the croutons. Are you covering a casserole? Visually look to see if the single bag would spread out to do what you need it to do.

What is the moisture content of seeds when germination starts ?

Description : What is the moisture content of seeds when germination starts ?

Last Answer : Germination starts when seed moisture is 35-60 %.

What is the moisture content of seeds during harvesting from the field ?

Description : What is the moisture content of seeds during harvesting from the field ?

Last Answer : Seed moisture is 18-40% at harvest time .

How the moisture content of the aggregates obtainable at site affect the water content ratio specified?

Description : How the moisture content of the aggregates obtainable at site affect the water content ratio specified?

Last Answer : Obviously, if the aggregates are in a surface wet condition, meaning the moisture content is greater than the absorption, that surface water increases the water-to-cement ratio and affects strength and durability.

How do you describe the relationship between moisture content and microbial activity as the soil is gradually increased from this dry state to a saturated one What factors dictate the shape of the cur?

Description : How do you describe the relationship between moisture content and microbial activity as the soil is gradually increased from this dry state to a saturated one What factors dictate the shape of the cur?

Last Answer : Need answer

Of the following statements about the major soil types, the incorrect one is : (a) alluvial soils are easy to plough (b) red soils are rich in phosphorus, nitrogen and lime content (c) laterite is typically a soil of tropical regions which receive heavy seasonal rainfall (d) black soil is highly retentive of moisture and very productive

Description : Of the following statements about the major soil types, the incorrect one is : (a) alluvial soils are easy to plough (b) red soils are rich in phosphorus, nitrogen and lime content ( ... regions which receive heavy seasonal rainfall (d) black soil is highly retentive of moisture and very productive

Last Answer : Ans: (b)

The moisture content of a soil at which plants permanently wilt and will not recover.

Description : The moisture content of a soil at which plants permanently wilt and will not recover.

Last Answer : Ans.Permanent wilting point (PWP)

The amount of soil moisture or water content held in soil after excess water has drained away is called

Description : The amount of soil moisture or water content held in soil after excess water has drained away is called

Last Answer : Ans.Field capacity (FC)

Soil moisture content is determined by

Description : Soil moisture content is determined by

Last Answer : Ans.Tensiometer (at 0.85 bar)

Optimum moisture content for safe storage of mustard is

Description : Optimum moisture content for safe storage of mustard is

Last Answer : Ans.7-8%

The moisture content at harvesting stage of wheat

Description : The moisture content at harvesting stage of wheat

Last Answer : Ans.25-30% 3. Maize

The moisture content lines in psychrometric chart are also called as A. relative humidity lines B. specific humidity lines C. both a. and b. D. none of the above

Description : The moisture content lines in psychrometric chart are also called as A. relative humidity lines B. specific humidity lines C. both a. and b. D. none of the above

Last Answer : ANSWER : B

What is sensible cooling of air? A. the cooling in which sensible heat of air is removed in order to reduce temperature B. the cooling in which temperature of air is reduced without changing in its moisture content C. both a. and b. D. none of the above

Description : What is sensible cooling of air? A. the cooling in which sensible heat of air is removed in order to reduce temperature B. the cooling in which temperature of air is reduced without changing in its moisture content C. both a. and b. D. none of the above

Last Answer : ANSWER : C

Velocity of sound in air does not change with the change of – (1) Temperature of air (2) Pressure of air (3) Moisture content in air (4) Wind in the direction of propagation of sound

Description : Velocity of sound in air does not change with the change of – (1) Temperature of air (2) Pressure of air (3) Moisture content in air (4) Wind in the direction of propagation of sound

Last Answer : (2) Pressure of air Explanation: The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the ... ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.

Q No: 251 In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is A. [(100 + P1)/(100 – P2)] V1 B. [(100 – P1)/(100 + P2)] V1 C. [(100 – P1)/(100 – P2)] V1 D. [(100 + P2)/(100 – P1)] V1

Description : Q No: 251 In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is A. [(100 + P1)/(100 – P2)] V1 B. [(100 – P1)/(100 + P2)] V1 C. [(100 – P1)/(100 – P2)] V1 D. [(100 + P2)/(100 – P1)] V1

Last Answer : ANS: C

The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is A. 25 % B. 50 % C. 10 % D. 5 %

Description : The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is A. 25 % B. 50 % C. 10 % D. 5 %

Last Answer : ANS: B