Distribution transformers have good all day efficiency due to

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
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1 Answer

Answer :

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

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Related questions

Distribution transformers are generally designed for maximum efficiency around?

Last Answer : Distribution transformers are generally designed for maximum efficiency around 50% load.

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.

1 Sumpner's test is conducted on transformers to find A. Temperature B. Stray losses C. All-day efficiency D. None of the above

Description : 1 Sumpner's test is conducted on transformers to find A. Temperature B. Stray losses C. All-day efficiency D. None of the above

Last Answer : A. Temperature

Why the range of efficiency in transformers higher than those of other electrical machines?

Description : Why the range of efficiency in transformers higher than those of other electrical machines?

Last Answer : Transformers operate at higher efficiency when compared to other electrical machines.This is due to the absence of mechanical losses which is due to the absence of moving parts

What is the range of efficiency of transformers?

Description : What is the range of efficiency of transformers?

Last Answer : A:The efficiency of the transformer will be in the range of 94% to 99%. Among the available electrical machines the transformer has the highest efficiency

74)Power transformers are generally designed to have maximum efficiency around A. No load B. Half load C. Near full load D. 10% overload

Description : 74)Power transformers are generally designed to have maximum efficiency around A. No load B. Half load C. Near full load D. 10% overload

Last Answer : C. Near full load

Two transformers operating in parallel will share the load depending upon their (A) Rating. (B) Leakage reactance. (C) Efficiency. (D) Per-unit impedance.

Description : Two transformers operating in parallel will share the load depending upon their (A) Rating. (B) Leakage reactance. (C) Efficiency. (D) Per-unit impedance.

Last Answer : Ans: A Transformers having higher kVA rating will share more load.

Power transformers should be designed to have maximum efficiency (a) at one-fourth load (b) at one-half load (c) at or near full load (d) any of the above

Description : Power transformers should be designed to have maximum efficiency (a) at one-fourth load (b) at one-half load (c) at or near full load (d) any of the above

Last Answer : (c) at or near full load

Why energy conservation techniques should be adopted in transformers even though its efficiency is 90%?

Description : Why energy conservation techniques should be adopted in transformers even though its efficiency is 90%? 

Last Answer : Reason for energy conservation techniques should be adopted in transformers even though its efficiency is 90% : Transformer performance depends on its efficiency. Transformers used in real-time ... improve the efficiency of the transformer more than 90% as there are no mechanical losses.

Power transformers are generally designed to have maximum efficiency around?

Last Answer : Power transformers are generally designed to have maximum efficiency around near full-load.

The efficiency of two identical transformers under load conditions can be determined by?

Description : The efficiency of two identical transformers under load conditions can be determined by?

Last Answer : The efficiency of two identical transformers under load conditions can be determined by back-to-back test.

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are (a) 0.5 to 0.8 Wb/m2 (b) 0.8 to 1.0 Wb/m2 (c) 1.1 to 1.35 Wb/m2 (d) 1.4 to 1.8 Wb/m2

Description : The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are (a) 0.5 to 0.8 Wb/m2 (b) 0.8 to 1.0 Wb/m2 (c) 1.1 to 1.35 Wb/m2 (d) 1.4 to 1.8 Wb/m2

Last Answer : (c) 1.1 to 1.35 Wb/m2

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

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

At what power maximum efficiency of power transformer and distribution transformer is designed

Description : At what power maximum efficiency of power transformer and distribution transformer is designed

Last Answer : Maximum efficiency of the transformer is attained at certain load factor (α) when core losses of transformer is equal to the copper losses. PCore loss = α ^2 X PCopper loss From the ... the day. Hence distribution transformers are designed to have maximum efficiency at 50% of the rated full load

Why the efficiency of distribution transformer is 60 to 70 % and not 100%?

Description : Why the efficiency of distribution transformer is 60 to 70 % and not 100%?

Last Answer : Distribution transformer is designed for maximum efficiency at 60% to 70% load as it normally doesn't operate at full load all the time. Its load depends on distribution demand. Whereas power transformer ... efficiency at 100% load as it always runs at 100% load being near to generating station.

Pick out the wrong statement. (A) In solvent extraction, the distribution co-efficient should be as large as possible for solvent economy (B) With increase in pressure, the solubility of gases in solvent increases at a fixed temperature (C) Decrease in Murphree plate efficiency is an indication of entrainment in distillation column (D) The capacity of a distillation column is maximum at total reflux

Description : Pick out the wrong statement. (A) In solvent extraction, the distribution co-efficient should be as large as possible for solvent economy (B) With increase in pressure, the solubility of ... in distillation column (D) The capacity of a distillation column is maximum at total reflux

Last Answer : (D) The capacity of a distillation column is maximum at total reflux

………….. is a situation in which it is not possible to make someone better off without making someone worse off (a) Social efficiency ; (b) Production efficiency ; (c) Distribution efficiency ; (d) Pareto efficiency

Description : ………….. is a situation in which it is not possible to make someone better off without making someone worse off (a) Social efficiency ; (b) Production efficiency ; (c) Distribution efficiency ; (d) Pareto efficiency

Last Answer :  (d) Pareto efficiency

The maximum efficiency of a distribution transformer is?

Last Answer : The maximum efficiency of a distribution transformer is at 50% full load.

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

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%

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

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 

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.

which type of oil is use in transformers ?

Description : which type of oil is use in transformers ?

Last Answer : Mineral oil is use in transformers .

Maintain 850 OC for 1 hour (soaking time).  Cool the material to 60 OC in 4 hours. a) Calculate the efficiency of the furnace, if the specific heat of steel is 0.12 kcal/kgOC and fuel oil consumption per batch is 1400 litres.  GCV of fuel oil - 10200 kcal/kg,  Cost of fuel oil - Rs. 46,000/kL,  Sp. gr. of fuel oil - 0.92. b) Due to high cost of oil, the plant management decides to convert to a lower operating cost LPG fired furnace lined on the inside with ceramic fibre insulation and with an operating efficiency of 80%, for same requirement. The investment towards installation of the new furnace is Rs. 50 lakhs. Calculate the Return on Investment, if the plant operates two batches per day and 250 days in a year.  Cost of LPG - Rs. 75/kg,  GCV of LPG - 12500 kcal/kg.

Description : In a heat treatment shop, steel components are heat-treated in batches of 80 Tons. The  heat treatment cycle is as follows;  Increase temperature from 30 OC to 850 OC in 3 hours.  ... efficiency of 80%, for same requirement. The investment towards installation of  the new furnace is Rs. 50

Last Answer : Quantity of steel treated per batch - 80 Tons a. Efficiency of Furnace: Useful heat supplied to steel - 80000 x 0.12 x (850 - 30)   = 7872000 kcal/batch .1 mark Total heat ... = Rs. 64400/batch Efficiency of new LPG furnace - 80% Heat supplied in new LPG furnace - 7872000/0.8

A transformer operates 24 hours day at full -load. It's full -load efficiency is :

Description : A transformer operates 24 hours day at full -load. It's full -load efficiency is :  (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency

Last Answer : A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency 

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

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.

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