Distribution transformers have core losses:

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
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Answer :

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

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Related questions

[75] Two transformers are connected in parallel. These transformers do not have equal percentage impedance which results A. Short-circuiting of the secondaries B. Power factor of one of the transformers is leading while that of the other lagging C. Transformers having higher copper losses will have negligible core losses D. Loading of the transformers not in proportion to their kVA ratings.

Description : [75] Two transformers are connected in parallel. These transformers do not have equal percentage impedance which results A. Short-circuiting of the secondaries B. Power factor of one of the ... have negligible core losses D. Loading of the transformers not in proportion to their kVA ratings.

Last Answer : D. Loading of the transformers not in proportion to their kVA ratings

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

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

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

What are the losses of transformers ?

Description : What are the losses of transformers ?

Last Answer : 1. Copper loss 2. Core loss

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

Which of the following are constant losses in Transformers?

Description : Which of the following are constant losses in Transformers? (1) Winding losses (2) Core losses (3) Both Winding & core losses (4) None of these

Last Answer : Which of the following are constant losses in Transformers? (1) Winding losses (2) Core losses (3) Both Winding & core losses (4) None of these

Losses which occur in rotating electric machines and do not occur in transformers are?

Description : Losses which occur in rotating electric machines and do not occur in transformers are?

Last Answer : Friction losses windage losses 

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.

In transformers, why the low voltage winding is placed near the core?

Description : In transformers, why the low voltage winding is placed near the core?

Last Answer : The winding & Core are both made of metals and so an insulation have to be placed in between them, the thickness of insulation depends on the voltage rating of the winding. In order to reduce the insulation requirement the low voltage winding place near the core.

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.

In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core (a) 5 percent (b) 10 percent (c) 15 percent (d) 30 percent (e) none of the above

Description : In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core (a) 5 percent (b) 10 percent (c) 15 percent (d) 30 percent (e) none of the above

Last Answer : (c) 15 percent

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

Distribution transformers are generally designed for maximum efficiency around?

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

State the advantages of amorphous core type distribution transformer.

Description : State the advantages of amorphous core type distribution transformer.

Last Answer : Advantages of amorphous core type distribution transformer: 1) Increases efficiency of transformer as constant losses are reduced by 75 % compared to conventional transformers. 2) The material has high ... . 7) High Reliability. 8) Excellent short circuit capacity. 9) Less maintenance cost.

Which of the following losses is/are present in every direct current generator armature? A. Winding copper loss B. Core eddy current loss C. Magnetic hysteresis loss D. All of the above.

Description : Which of the following losses is/are present in every direct current generator armature? A. Winding copper loss B. Core eddy current loss C. Magnetic hysteresis loss D. All of the above.

Last Answer : Answer: D

Although saturable reactors are extremely useful in some applications, their gain is low because of ____________. A. core hysteresis losses B. inductive reactance in the control winding C. IR drop throughout the load winding D. all of the above

Description : Although saturable reactors are extremely useful in some applications, their gain is low because of ____________. A. core hysteresis losses B. inductive reactance in the control winding C. IR drop throughout the load winding D. all of the above

Last Answer : Answer: A

In single core cables armouring is not done to (a) avoid excessive sheath losses (b) make it flexible (c) either of the above (d) none of the above

Description : In single core cables armouring is not done to (a) avoid excessive sheath losses (b) make it flexible (c) either of the above (d) none of the above

Last Answer : (a) avoid excessive sheath losses

How are source-to-fiber coupling and microbending and macrobending losses affected by changes in core diameter and D?

Description : How are source-to-fiber coupling and microbending and macrobending losses affected by changes in core diameter and D?

Last Answer : Coupling efficiency increases with both core diameter and D, while bending losses increase directly with core diameter and inversely with D.

72 Harmonics in transformer result in A. Increased core losses B. Increased I2R losses C. Magnetic interference with communication circuits D. All of the above

Description : 72 Harmonics in transformer result in A. Increased core losses B. Increased I2R losses C. Magnetic interference with communication circuits D. All of the above

Last Answer : D. All of the above

[53] The iron loss of the transformer is negligible during short circuit test because A. The entire input is just sufficient to meet Cu losses only B. Flux produced is a small fraction of the normal flux C. Iron core becomes fully saturated D. Supply frequency is held constant

Description : [53] The iron loss of the transformer is negligible during short circuit test because A. The entire input is just sufficient to meet Cu losses only B. Flux produced is a small fraction of the normal flux C. Iron core becomes fully saturated D. Supply frequency is held constant

Last Answer : B. Flux produced is a small fraction of the normal flux

45 The function of conservator in a transformer is A. To protect against internal fault B. To reduce copper as well as core losses C. To cool the transformer oil D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

Description : 45 The function of conservator in a transformer is A. To protect against internal fault B. To reduce copper as well as core losses C. To cool the transformer oil D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

Last Answer : D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

43 The purpose of providing an iron core in a transformer is to A.Provide support to windings B. Reduce hysteresis loss C. decrease the reluctance of the magnetic path D. reduce eddy current losses

Description : 43 The purpose of providing an iron core in a transformer is to A.Provide support to windings B. Reduce hysteresis loss C. decrease the reluctance of the magnetic path D. reduce eddy current losses

Last Answer : C. Decrease the reluctance of the magnetic path

8 The transformer core is laminated to A. Reduce the copper losses B. Reduce the core losses C. Reduce the eddy current losses D. None of the above

Description : 8 The transformer core is laminated to A. Reduce the copper losses B. Reduce the core losses C. Reduce the eddy current losses D. None of the above

Last Answer : C. Reduce the eddy current losses

I13) In an ideal transformer A. windings have no resistance B. core has no losses C. core has infinite permeability D. all of the above

Description : 13) In an ideal transformer A. windings have no resistance B. core has no losses C. core has infinite permeability D. all of the above

Last Answer : D. All of the above

The efficiency of a transformer is mainly dependent on (A) core losses. (B) copper losses. (C) stray losses. (D) dielectric losses.

Description : The efficiency of a transformer is mainly dependent on (A) core losses. (B) copper losses. (C) stray losses. (D) dielectric losses.

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Which of the following problem arises in D.C. motors which are fed from thyristor bridge circuits ? (a) Increased I R losses (b) Increased core losses (c) Poor commutation (d) Change in motor parameters (e) All of the above

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Reduction in core losses and increase in permeability are obtained with transformer employing?

Description : Reduction in core losses and increase in permeability are obtained with transformer employing?

Last Answer : Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

Line losses in a distribution circuit are kept to a minimum by __________. A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage C. increasing the number of thermal relays in the circuit D. using higher voltage and lower current

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Last Answer : Answer: D

Petroff’s equation is used to find out (A) Load carrying capacity of the bearing (B) Frictional losses in the bearing (C) Unit bearing pressure on the bearing (D) Pressure distribution around the periphery of the journal

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Last Answer : (B) Frictional losses in the bearing

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Last Answer : B. writing of

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Description : State the losses in secondary distribution system. 

Last Answer : The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply

Explain how technical losses can be reduced by use of energy efficient transformer in Transmission and Distribution system.

Description : Explain how technical losses can be reduced by use of energy efficient transformer in Transmission and Distribution system.

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Explain the following energy conservation techniques: (i) By reducing I2R losses in Trans. system (ii) By optimizing distribution voltage.

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List out the different technical losses that takes place in Transmission and Distribution system.

Description : List out the different technical losses that takes place in Transmission and Distribution system.

Last Answer : Different technical losses that takes place in Transmission and Distribution system: 1) Losses due to random growth of sub transmission &distribution system. planned growth/expansion maintains ... unsatisfactory reactive power compensation. 6) Losses due to poor quality of equipment used. 

Explain scenario of transmission and distribution losses at national level.

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Last Answer : Scenario of transmission and distribution losses at national level: i) T & D losses in India are the highest in the world. Inadequate investment in T&D network is one of the main reasons ... . According to planning commission report, the target is to minimize these losses to 18% upto 2018.

State commercial losses in transmission and distribution systems. Also state the remedies for the same.

Description : State commercial losses in transmission and distribution systems. Also state the remedies for the same.

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With neat diagram explain use of “reactive power controller” to reduce technical losses in transmission and distribution system.

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Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Description : Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Last Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

State and explain any four commercial losses in transmission and distribution system.

Description : State and explain any four commercial losses in transmission and distribution system.

Last Answer : Skin effects Carvana effect  Core loss  Over current 

State and explain any four technical losses in transmission and distribution systems.

Last Answer : Technical losses: i) Copper losses ii) Unbalance loading iii) Long length of distribution lines iv) Conductor of inadequate size v) Various losses in transformer vi) Long distance between transformer and ... be the season behind this which is due to less interest of the line men in their work.

optical launch conditions exists if the launch spot size and angular distribution are larger than that of the fiber core?

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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%

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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