Mention the properties of transformer oil.

Mention the properties of transformer oil.
by

1 Answer

Answer :

Properties of transformer oil are,

a) Colour – pale yellow.

b) Moisture content - <10 ppm.

c) Acidity (KOH/gramme of oil) – <0.1.

d) Dielectric strength – limit value is 45 kV and preferable value is 60 kV.

e) Flash point - 141º C.

f) Inter surface tension – 30 to 40 dynes / cm or 0.3 to 0.4 Newton.

g) Resistivity –
by

Related questions

Mention the properties of oil used in transformers.

Description : Mention the properties of oil used in transformers.

Last Answer : The following are the desirable properties of transformer oil: -->It should be free from moisture --> It should have high dielectric strength --> It should have thermally stability and higher thermal conductivity -->It should be contaminated by temperature rise.

What are the properties of ideal transformer?

Description : What are the properties of ideal transformer?

Last Answer : 1.There should be no losses 2.The winding should have zero resistance 3.The leakage flux should be zero 4. The permeability of core should be so high that the negligible current is required to establish the flux in it.

State and explain properties of transformer oil.

Description : State and explain properties of transformer oil.  

Last Answer : Following are the properties of transformer oil:-  1. Dielectric strength :- It should be have a high dielectric strength  2. Specific resistance:- It should be have a high Specific ... be not contain impurities such as sulpher & its compounds to avoid rusting & sludge formation. 

Mention the important properties of relay contacts.

Description : Mention the important properties of relay contacts. 

Last Answer : a. Should be robust in construction. b. Self-cleaning (oxides easily breakdown). c. Corrosion resistant. d. Bounces free and striction free (low contact resistance). e. Able to carry rated continuous current and short time rated current. 

Mention the short comings of Merz Price scheme of protection applied to a power transformer.

Description : Mention the short comings of Merz Price scheme of protection applied to a power transformer.

Last Answer : In a power transformer, currents in the primary and secondary are to be compared. As these two currents are usually different, the use of identical transformers will give differential current, and ... turn-ratio are used, the differential current may flow through the relay under normal condition.

Mention the important parts of a power transformer and their purposes.

Description : Mention the important parts of a power transformer and their purposes. 

Last Answer : Conservator: This allows for shrinkage and swelling of transformer oil. When the oil is heated up it swells and rises to the conservator. When cools down it goes back to main tank. Conservator reduces sludge ... put. There are two types of tap changer. Online tap changer and off line tap changer.  

What are the losses in a power transformer and mention how these losses can be minimised?

Description : What are the losses in a power transformer and mention how these losses can be minimised?

Last Answer : There are two losses in a transformer. a. Iron losses. b. Copper losses. Iron losses - Iron losses constitutes of two losses. a. Eddy current losses, these are due to the induced emf in the core ... the load current I - current through winding. r - resistance of winding. t - time duration. 

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. 

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

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

Last Answer :

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.

Which of the following properties is not necessarily desirable in the material for transformer core? A. Mechanical strength B. Low hysteresis loss C. High thermal conductivity D. High permeability

Description : Which of the following properties is not necessarily desirable in the material for transformer core? A. Mechanical strength B. Low hysteresis loss C. High thermal conductivity D. High permeability

Last Answer : C) high thermal conductivity

List and explain the properties of quarter wave transformer.

Description : List and explain the properties of quarter wave transformer.

Last Answer : Properties of quarter wave transformer: 1. Impedance transfomation: it provides impedance transformation upto the highest frequencies and is compatible with transmission line. 2. Impedance inversion: if ZL is ... or step up transformer,depending on whether ZL IS greater than or less than ZO.

State any four properties of Ideal transformer.

Description : State any four properties of Ideal transformer.

Last Answer : Properties of Ideal transformer: 1) No losses (iron and copper losses), hence no temperature rise. 2) No magnetic leakage i.e (Coefficient of coupling between primary and secondary windings is unity) 3) Zero winding ... drop i.e. E1 = V1, E2 = V2 5) Efficiency 100 %. 6) Regulation 0 %.

State four properties of Ideal transformer:

Description : State four properties of Ideal transformer:

Last Answer : Properties of Ideal transformer: 1) No losses (iron and copper), hence no temperature rise 2) Zero winding resistance and leakage reactance 3) No voltage drop i.e. E1 = V1, ... R losses]   4) Zero magnetic leakage (coefficient of coupling between primary and secondary windings is unity).

The desirable properties of transformer core material are

Description : The desirable properties of transformer core material are  (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.

Last Answer : The desirable properties of transformer core material are high permeability and low hysteresis loss.

Mention three properties of mica. -SST 10th

Description : Mention three properties of mica. -SST 10th

Last Answer : (i) Mica is a mineral made up of a series of plates or leaves. (ii) It splits easily into thin sheets. These sheets can be so thin that a thousand can be layered into ... properties and resistance to high voltage, mica is considered an important mineral used in electric and electronic industries.

Mention some of the properties of Red Soil. -SST 10th

Description : Mention some of the properties of Red Soil. -SST 10th

Last Answer : (i) Red Soils are formed in situ by weathering of the ancient crystalline and metamorphic rocks. (ii) They are rich in iron content, hence, they are red in colour. (iii) The productivity of the ... not retentive to moisture. (v) They are suited for dry farming as it does not require much moisture.

What are colligative properties? Mention them.

Description : What are colligative properties? Mention them.

Last Answer : Ans:-these are the colligative properties. (a) Osmotic pressure (b) Relative lowering of vapour pressure (b) Elevation in B.P (d) Depression in F.P

Mention the properties of carbon

Description : Mention the properties of carbon

Last Answer : Carbon is a non-metal It is the first member of group 14 of periodic table. Its valency is four.

Mention the chemical properties.

Description : Mention the chemical properties.

Last Answer : a) Methane being saturated is chemically inert. b) It is not attacked acids, alkalies and oxidising agents like concentrated sulphuric acid, nitric acid and potassium permanganate.

Mention the physical properties of methane.

Description : Mention the physical properties of methane.

Last Answer : a) Methane is colourless, odourless gas. b) It is lighter than air. c) It is slightly soluble in water and favourable soluble in organic solvents like alcohol and ether.

Mention the properties of carbon.

Description : Mention the properties of carbon.

Last Answer : Carbon is a non-metal It is the first member of group 14 of periodic table. Its valency is four.

What is clay? Mention its properties.

Description : What is clay? Mention its properties.

Last Answer : Clay is complex mixture of silicates. It is a naturally occurring thermally setting substance. Clay can be moulded to any desired shape. It becomes hard and brittle on heating but it retains it shape.

Mention the properties of glass.

Description : Mention the properties of glass.

Last Answer : a) Glass is chemical resistant. Glass container can hold aquaregia. b) It has smooth and shining surface. It can be polished. c) It can be moulded into different shapes. d) It can be ... It can be sketched to produce designs. g) Properties of glass can be altered suitably by including additives.

State the functions of a fuse. Mention the desirable properties of fuse materials.

Description : State the functions of a fuse. Mention the desirable properties of fuse materials.

Last Answer : Ans: Fuse is a protective device, which consists of a thin wire or strip. This wire or strip is placed with the circuit it has to protect, so that the circuit-current flows through it. When ... silver and silver alloys are used of lower ratings. Copper alloys are used in fuses of higher ratings.

1. By which algae is Nitrogen fixation done? 2. Which post does the Constitution of India not mention? 3. When do all the magnetic materials lose their magnetic properties? 4. Why are the Canals in Western Europeare mainly used? 5. By whom was the ‘Tahglq-i-Hind', a famous literary work, written?

Description : 1. By which algae is Nitrogen fixation done? 2. Which post does the Constitution of India not mention? 3. When do all the magnetic materials lose their magnetic properties? 4. Why are the ... belongs to which mountains? 20. During the reign of emperor was the artillery most perfect and numerous?

Last Answer : Answer : 1. Blue-green algae 2. The Deputy Prime Minister 3. Strongly heated 4. For inland navigation 5. Alberuni 6. 5th June 7. Manipur 8. Analogous organs 9. Oxbow lake 10. Vallabhacharya 11 ... 17. Due to presence of Bacteriophages 18. As a Union of States 19. Fold mountains 20. Aurangzeb

Mention the factors on which the magnitude of the e.m.f induced in the transformer depends.

Description : Mention the factors on which the magnitude of the e.m.f induced in the transformer depends.

Last Answer : 1) E.m.f in the primary coil 2) Number of turns in the primary coil 3) Number of turns in the secondary coil 4) The core material

Which of the electrical properties listed will always be the same for each component in a parallel circuit? A. Impedance B. Current C. Resistance D. Voltage

Description : Which of the electrical properties listed will always be the same for each component in a parallel circuit? A. Impedance B. Current C. Resistance D. Voltage

Last Answer : Answer: D

What are the basic properties of Signal Flow Graph?

Description : What are the basic properties of Signal Flow Graph?

Last Answer : The basic properties of the signal flow graph are: Signal Flow Graphs are applicable to linear systems It consists of nodes and branches. A node is a point representing a variable or signal. A ... the gain of the branch The algebraic equations must be in the form of cause and effect relationship

What are the properties of SF6 gas?

Description : What are the properties of SF6 gas?  

Last Answer : This is inert gas. Odorless, non-toxic, colourless, stable, non-inflammable and density is more hence high dielectric strength. The special property of this gas is Electro negativity. This gas ... more slow in conduction, so that resistance in medium is increases and get arc get extinguishes. 

What are the properties of SF6 gas?

Description : What are the properties of SF6 gas?  

Last Answer : Physical properties 1. Colourless 2. Odorless 3. Non-toxic. Pure SF6 gas is not harmful to the health. 4. Non-inflammable. 5. Density- more gas density, 5 times ... advantages offer increased safety, reduction in size, weight, noiseless operation, easy installation, handling and maintenance. 

What are the properties of hydrogen and DM water?

Description : What are the properties of hydrogen and DM water?

Last Answer : Hydrogen a. Windage losses are less. Hence efficiency increased. b. Heat transfer is more. Hence output per volume is increased. c. No corona discharge, which makes insulation life long. d. Lesser ... . c. Low conductivity. d. Freedom from fire risk. e. External heat exchanger used. 

What are the properties of good illumination?

Description : What are the properties of good illumination?

Last Answer : a. It should have sufficient light. b. It should not strike the eyes. c. It should not produce glares. d. Light should be uniform. e. It should be of harmonious. f. It should be of correct type as needed. g. It should have suitable shade and reflector. h. Economically productive.

What are the properties of good conductor?

Description : What are the properties of good conductor?

Last Answer : Properties of good conductor a. It posses very low resistance or specific resistance. b. It posses more conductance and there by conducts electricity readily through it. c. It is a good conductor of heat. d ... readily joinable. k. It must be very low in cost. l. It must available in plenty.

In the heating process of the ________type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains them when cooled to a temperature below this value. (A) Indirect induction over (B) core type induction furnace (C) coreless induction furnace (D) high frequency eddy current

Description : In the heating process of the ________type a simple method of temperature control is possible by means of a special alloy which loses its magnetic properties at a particular high temperature and regains ... ) core type induction furnace (C) coreless induction furnace (D) high frequency eddy current

Last Answer : Ans: D Magnetic property of alloy changes with change of the temperature and Heat is produced due to eddy current = i2R and i α f2

Petroleum deposits are detected by the. (A) Oil seepage at the surface of the earth (B) Measurement of density, elasticity and magnetic & electric properties of the rock in the crust of the earth (C) Age & nature of rocks inside the crust of the earth (D) All (A), (B) and (C)

Description : Petroleum deposits are detected by the. (A) Oil seepage at the surface of the earth (B) Measurement of density, elasticity and magnetic & electric properties of the rock in the crust of the earth (C) Age & nature of rocks inside the crust of the earth (D) All (A), (B) and (C)

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

Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery (C) A high swelling index number of coking coal indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

Description : Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct ... indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas

Last Answer : (C) A high swelling index number of coking coal indicates poor caking properties of coal

Pick out the correct statement. (A) A fat is converted into oil by its hydrogenation (B) There is no difference between a fat and an oil so far as its physical properties are concerned (C) All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms (D) Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content

Description : Pick out the correct statement. (A) A fat is converted into oil by its hydrogenation (B) There is no difference between a fat and an oil so far as its physical properties are ... Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content

Last Answer : (C) All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms

Describe essential properties of oils used in oil hydraulic circuits

Description : Describe essential properties of oils used in oil  hydraulic circuits 

Last Answer : 1. Demulsibility: The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of emulsion. Or it is the oil's ability to release ... of a fluid to get compressed and liquids are less compressible. Compressibility is the reciprocal of bulk modulus.