which type of oil is use in transformers ?

which type of oil is use in transformers ?
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Answer :

Mineral oil is use in transformers .
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For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used ? (a) 1.0 to 1.2 A/mm2 (b) 1.5 to 2.0 A/mm2 (c) 2.2 to 3.2 A/mm2 (d) 3.2 to 4.2 A/mm2

Description : For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used ? (a) 1.0 to 1.2 A/mm2 (b) 1.5 to 2.0 A/mm2 (c) 2.2 to 3.2 A/mm2 (d) 3.2 to 4.2 A/mm2

Last Answer : (c) 2.2 to 3.2 A/mm2

What are the safety features of oil filled transformers?

Description : What are the safety features of oil filled transformers?

Last Answer : Environmental safety in case of spillage.There has to be a dyke wall for oil containment in case of spillage so that the oil does not get into ground / land.Oil level must be ... tested and minimum value must be maintained.Oil Cooling arrangement must be maintained.No leakage in radiators.

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.

Why oil transformers are out door?

Description : Why oil transformers are out door? 

Last Answer : Oil fire point = 170 ºC easy catching of fire.  

D. Loading of the transformers not i76 The changes in volume of transformer cooling oil due to variation of atmospeheric temperature during day and night is taken care of by which part of transformer? A. Conservator B. Breather C. Bushings D. Buchholz relay

Description : 76 The changes in volume of transformer cooling oil due to variation of atmospeheric temperature during day and night is taken care of by which part of transformer? A. Conservator B. Breather C. Bushings D. Buchholz relay

Last Answer : A. Conservator

A current density of _____ is ilsed for large power transformers with forced circulation of oil or with water cooling coils (a) 1.5 to 2.5 A/mm2 (b) 3.5 to 4.5 A/mm2 (c) 4.0 to 5.0 A/mm2 (d) 5.4 to 6.2 A/mm2

Description : A current density of _____ is ilsed for large power transformers with forced circulation of oil or with water cooling coils (a) 1.5 to 2.5 A/mm2 (b) 3.5 to 4.5 A/mm2 (c) 4.0 to 5.0 A/mm2 (d) 5.4 to 6.2 A/mm2

Last Answer : (d) 5.4 to 6.2 A/mm2

The forced oil and air circulation method is usual one for transformers of capacities (a) upto 5 MVA (b) upto 10 MVA (c) upto 20 MVA (d) 30 MVA upwards

Description : The forced oil and air circulation method is usual one for transformers of capacities (a) upto 5 MVA (b) upto 10 MVA (c) upto 20 MVA (d) 30 MVA upwards

Last Answer : (d) 30 MVA upwards

Natural oil cooling is used for transformers up to a rating of?

Last Answer : Natural oil cooling is used for transformers up to a rating of 3000 kVA.

Core type transformers are popular in___________.

Description : Core type transformers are popular in___________.  (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above

Last Answer : Core type transformers are popular in High voltage applications

of what use are current and voltage transformers in protective systems

Last Answer : Current transformers (CT) : Current transformer (CT) actually step down the high current to low current for the operation of relays. Current transformer is use for measurement of ... use for relay. This is about potential transformer.

Give any two advantages of star-star connection in 3-ф transformers.

Last Answer : Advantages of star-star connection in 3-ф transformers: 1. It is possible to use the transformer for 3-phase, four wire system because of neutral. 2. The phase shift between primary and ... times line voltage, the no.of turns required for primary and secondary are less, hence economical.

Classification of transformers

Description : Classification of transformers

Last Answer : Classification of transformers: Transformers are classified on the basis of core construction, frequency, and power. These are the three broad groups of transformers. a) Core construction ... Power transformers are used in conjunction with generators, 2. Distribution transformer

Distribution transformers have good all day efficiency due to

Description : Distribution transformers have good all day efficiency due to  (A) low copper loss (B) low iron loss (C) low copper and iron loss (D) None of these

Last Answer : Distribution transformers have good all day efficiency due to low iron loss

Which of the following connection of transformers will give highest value of secondary voltage ?

Description : Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

Last Answer : Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

Two transformers A and B having equal outputs and voltage ratios but unequal percentage

Description : Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 

Last Answer : Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 33%

The friction losses in Real Transformers are :

Description : The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%

Last Answer : A

Two 3-phase transformers cannot be operated in parallel, if their :

Description : Two 3-phase transformers cannot be operated in parallel, if their :  (A) kVAs are different (B) phase sequences are different (C) % impedances are different (D) voltage ratios are different

Last Answer : Two 3-phase transformers cannot be operated in parallel, if their : phase sequences are different

Which of the following is the advantage of using CRGO steel in transformers?

Description : Which of the following is the advantage of using CRGO steel in transformers? A) High magnetic flux density B) Low permeability C) Both A and B D) None of these

Last Answer : It definitely High Magnetic Flux Density since a crgo steel has always a more around 3% of silicon proportion among the remaining ferrite which make cold rolled grain oriented steel having high flux magnetic ... for more about the crgo core you can learn here https://nicoreindia.com/crgo-core/

Two transformers having the same p.u. impedance connected in parallel share the connected load

Description : Two transformers having the same p.u. impedance connected in parallel share the connected load (A) equally (B) in proportion to the respective ratings (C) in proportion to the voltage ratio (D) in proportion to the zero phase displacement

Last Answer : Two transformers having the same p.u. impedance connected in parallel share the connected load in proportion to the respective ratings

Non -loading heat run test on transformers is performed by means of

Description : Non -loading heat run test on transformers is performed by means of

Last Answer : Non -loading heat run test on transformers is performed by means of Sumpner's test

Consider the following statements regarding three-phase transformers in Open -Delta (V -V) connections

Description : Consider the following statements regarding three-phase transformers in Open -Delta (V -V) connections :  1. Being a temporary remedy when one transformer forms of Delta -Delta system is &imaged, and removed from service.  ... and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Last Answer : Consider the following statements regarding three-phase transformers in Open -Delta (V -V) connections :  1. Being a temporary remedy when one transformer forms of Delta -Delta system is &imaged, and removed from service.  ... and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

In potential transformers, the secondary turns are increased slightly and the primary and secondary windings...

Description : In potential transformers, the secondary turns are increased slightly and the primary and secondary windings are wound as closely as possible to compensate for  (a) Phase angle and ratio error, ... loss and hysteresis loss, respectively  (d) The hysteresis loss and eddy current loss, respectively

Last Answer : In potential transformers, the secondary turns are increased slightly and the primary and secondary windings are wound as closely as possible to compensate for Ratio and phase angle error, respectively 

Regulating transformers are used in power systems for control of :

Description : Regulating transformers are used in power systems for control of : a) voltage b) power factor c) power flow d) all of the above

Last Answer : Regulating transformers are used in power systems for control of :  power flow 

Distribution transformers have core losses:

Description : Distribution transformers have core losses:  (1) More than full load copper losses (2) Equal to full load copper losses (3) Less than full load copper losses (4) W Negligible compared to full load copper losses

Last Answer : Distribution transformers have core losses:  Less than full load copper losses.

Is Doble Testing valid on "Dry Type" transformers What is ANSI or IEEE 's opinion?

Description : Is Doble Testing valid on "Dry Type" transformers What is ANSI or IEEE 's opinion?

Last Answer : Refer this url to know about IEEE/ANSI

Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of dirt and conductive debris C. periodic testing of insulation resistance with a megger D. all of the above

Description : Routine maintenance of dry-type transformers should include ______________. A. preventing the entrance of water from broken pipe lines steam lines B. keeping protective surfaces and insulating bushings free of ... debris C. periodic testing of insulation resistance with a megger D. all of the above

Last Answer : Answer: D

Routine maintenance of dry-type transformers should include ____________. A. cleaning the windings, if accessible, with a vacuum cleaner or very low pressure air B. measuring and recording the winding temperature with an accurate mercury thermometer C. periodic cleaning of the winding insulation with an approved solvent D. making sure that the units are close to bulkheads or corners to protect them from damage

Description : Routine maintenance of dry-type transformers should include ____________. A. cleaning the windings, if accessible, with a vacuum cleaner or very low pressure air B. measuring and recording the winding ... . making sure that the units are close to bulkheads or corners to protect them from damage

Last Answer : Answer: A

What are the advantages of shell type transformer over core type transformers?

Description : What are the advantages of shell type transformer over core type transformers?

Last Answer : In shell type transformers the coils are well supported on the all sides and so they can withstand higher mechanical stresses developed during short circuit conditions. Also the leakage reactance will be less in shell type transformers.

State the type transformers?

Description : State the type transformers?

Last Answer : Transformers can be classified into different groups and types based on the following factors. 1. Type of core. a. Core type transformer core. b. Shell type transformer core. c. ... Auto transformer. b. Potential transformer (instrument transformer). c. Current transformer (instrument transformer).

Helical windings are used in (a) distribution transformers (b) power transformers (c) shell type transformers (d) none of the above

Description : Helical windings are used in (a) distribution transformers (b) power transformers (c) shell type transformers (d) none of the above

Last Answer : (b) power transformers

Why should Dry-Type Transformers never be overloaded?

Description : Why should Dry-Type Transformers never be overloaded?

Last Answer : Overloading of a transformer results in excessive temperature. This excessive temperature causes overheating which will result in rapid deterioration of the insulation and cause complete failure of the transformer coils.

In the illustrated electronic governor, the circuit card connected to the potential and current transformers is for ________. EL-0046 A. increasing the signal strength to the governor to maintain constant engine speed with increased load B. send a kilowatt signal to the metering circuit C. shutting down the prime mover in the event of reverse power to protect from motorization D. conditioning the load through the use of a magnetic amplifier current transformer

Description : In the illustrated electronic governor, the circuit card connected to the potential and current transformers is for ________. EL-0046 A. increasing the signal strength to the governor to ... from motorization D. conditioning the load through the use of a magnetic amplifier current transformer

Last Answer : Answer: A

Why we need isolation transformers in power circuit ? why cant we use breakers to isolate?

Description : Why we need isolation transformers in power circuit ? why cant we use breakers to isolate?

Last Answer : In Isolation transformer is used, if there is change in parameter values of any side, the other side parameters will remain unchanged.

The use of permanent magnets is. not made in (a) magnetoes (6) energy meters (c) transformers (d) loud-speakers

Description : The use of permanent magnets is. not made in (a) magnetoes (6) energy meters (c) transformers (d) loud-speakers

Last Answer : (c) transformers

71 High frequency transformers sometimes make use of ferrite cores because it has A. High specific gravity B. High resistance C. High hysteresis D. low permeability

Description : 71 High frequency transformers sometimes make use of ferrite cores because it has A. High specific gravity B. High resistance C. High hysteresis D. low permeability

Last Answer : B. High resistance

Name this much publicized group of compounds, of which there are 209 congeners. It was first discovered as an environmental pollutant in 1966, and its widespread use in electrical transformers has spread these compounds into the food chain to such an extent that most adults have small concentrations in their fatty tissue.

Description : Name this much publicized group of compounds, of which there are 209 congeners. It was first discovered as an environmental pollutant in 1966, and its widespread use in electrical transformers has ... food chain to such an extent that most adults have small concentrations in their fatty tissue. 

Last Answer : ANSWER: PCB's (Accept POLYCHLORINATED BIPHENYL'S) 

What is the quote by Optimus Prime at the end of the New Transformers Movie?

Description : What is the quote by Optimus Prime at the end of the New Transformers Movie?

Last Answer : I think it’s something like, “There is nothing original in Hollywood. See you in Transformers 3.”

Are transformers childish?

Description : Are transformers childish?

Last Answer : Depends who you ask. Good for you for sticking with what you love! Can’t knock you for that. I secretly wish I had a box of transformer toys…

What are transformers made of ?

Description : What are transformers made of ?

Last Answer : Transformers are mainly made of the following things. 1. Primary coil 2. Secondary coil and 3. Magnetic cores also use more different types of components depending on the type and need.

What is the function of Transformer's conservator ?

Description : What is the function of Transformer's conservator ?

Last Answer : Oil increases in volume when it is hot and decreases in volume when it is cold. A drum is placed on the tank to facilitate growth and reduction. This drum is called Conservator. It is ... the conservator, while when the volume decreases, the oil comes down from the conservator to the tank.

How many types of transformers according to the structure of the core ?

Description : How many types of transformers according to the structure of the core ?

Last Answer : There are three types of transformers according to the structure of the core , namely- (a) core type (b) shell type (c) spiral core type.

What are the losses of transformers ?

Description : What are the losses of transformers ?

Last Answer : 1. Copper loss 2. Core loss

How many types of transformers ?

Description : How many types of transformers ?

Last Answer : 2 types of transformers ?

Transformers Who Ready Do ?

Last Answer : answer : W. Stanley Transformers Ready Does.

Auto Transformers What ?

Last Answer : that In the transformer A Only Wanding Stays And Primary, Secondary Two coils Of each other With Electrically And Magnetically Connection To do Stays Him Auto Transfer Says.

Transformers What? What? With Composed ?

Last Answer : Transformer The following Machinery With Formed , winding Core Earth Points Bushing Insulation Breeder Tanks Bukhlaj Relay Conservator.

What components compose the excitation current of a transformer. How are they modeled in the transformer's equivalent circuit?

Description : What components compose the excitation current of a transformer. How are they modeled in the transformer's equivalent circuit?

Last Answer : Excitation current Io = Iw + Iu

What components compose the excitation current of a transformer. How are they modeled in the transformer's equivalent circuit?

Description : What components compose the excitation current of a transformer. How are they modeled in the transformer's equivalent circuit?

Last Answer : Excitation current Io = Iw + Iu

Official Transformers Bumblebee Model?

Description : Official Transformers Bumblebee Model?

Last Answer : The new Transformers films have proceeded to win the hearts ofmillions worldwide both child and adult alike. So imagine theexcitement when the new fully transforming figures hit theshops.One of the ... getting to grips with the figure it can easilybe transformed into the beautiful 2008 yellow Camar

Two transformers of identical voltages but different capacities are operated in parallel, for satisfactory load sharing: a) Impedances should be equal b) Per unit impedance must be equal c) per unit impedance and X/R ratio must be equal d) Impedance and X/R ratio must be equal

Description : Two transformers of identical voltages but different capacities are operated in parallel, for satisfactory load sharing: a) Impedances should be equal b) Per unit impedance must be equal c) per unit impedance and X/R ratio must be equal d) Impedance and X/R ratio must be equal

Last Answer : Ans: C