Material used for construction of transformer core is usually?

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asked Mar 19, 2018 by anonymous

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asked May 8, 2018 by anonymous

The core construction is like spokes of a wheel in following transformer:

The core construction is like spokes of a wheel in following transformer: (A) Berry Type Transformer (B) Core Type Transformer (C) Shell Type Transformer (D) None of the above

Last answer: The core construction is like spokes of a wheel in following transformer: Berry Type Transformer

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103 views 1 answer

asked Mar 19, 2018 by anonymous

When secondary of a current transformer is open-circuited its iron core will be?

Last answer: When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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97 views 1 answer

asked May 1, 2018 by anonymous

The desirable properties of transformer core material are

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.

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120 views 1 answer

asked Jul 27, 2019 by anonymous

State any four characteristics of core type transformer.

Last answer: Characteristics of core type transformer: i) It has one window. ii) It has one magnetic circuit. iii) Core surrounds the winding. iv) Average length of core is more. v) Area of cross ... Better cooling for winding. vii) Mechnical strength is comparatively less. viii) Repair and maintenance is easy.

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70 views 1 answer

asked Mar 19, 2018 by anonymous

The size of a transformer core will depend on?

Last answer: The size of a transformer core will depend on frequency and area of the core.

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64 views 1 answer

asked Mar 19, 2018 by anonymous

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.

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592 views 1 answer

asked Apr 28, 2018 by anonymous

The main purpose of using core in a transformer is to

The main purpose of using core in a transformer is to (A) decrease iron losses (B) eliminate magnetic hysteresis (C) reduce reluctance of the common magnetic circuit (D) prevent eddy current loss

Last answer: The main purpose of using core in a transformer is to reduce reluctance of the common magnetic circuit

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808 views 1 answer

asked Sep 30, 2017 by anonymous

why the Transformer core is laminated?

Last answer: Transformer core is laminated to reduce Eddy current losses.

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84 views 1 answer

asked May 8, 2018 by anonymous

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Last answer: A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

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402 views 1 answer

asked Mar 14, 2018 by anonymous

Why does the core of a transformer need to be laminated?

Last answer: Transformer cores are laminated to reduce eddy current loss.

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73 views 1 answer

asked Mar 19, 2018 by anonymous

The core used in high frequency transformer is usually?

Last answer: The core used in high frequency transformer is usually air core .

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49 views 1 answer

asked May 7, 2020 by anonymous

State the material used for making (1) Magnetic Core (2) Fuse element

Last answer: The material used for making of: (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel (2) Fuse Element: Tin- lead wire, Tinned copper wire

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51 views 1 answer

asked Aug 12, 2018 by anonymous

State the four major parts of Transformer and material used for their construction.

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80 views 0 answers

asked Mar 19, 2018 by anonymous

The thickness of laminations used in a transformer is usually?

Last answer: The thickness of laminations used in a transformer is usually 0.4 mm to 0.5 mm.

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64 views 1 answer

asked Mar 20, 2018 by anonymous

The armature core of a D.C. generator is usually made of?

Last answer: The armature core of a D.C. generator is usually made of silicon steel.

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85 views 1 answer

asked Mar 19, 2018 by anonymous

The purpose of providing an iron core in a transformer is to?

Last answer: The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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83 views 1 answer

asked Mar 19, 2018 by anonymous

The purpose of providing iron core in a step-up transformer is?

Last answer: The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.

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274 views 1 answer

asked Mar 19, 2018 by anonymous

Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?

Last answer: Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds 150°C.

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104 views 1 answer

asked Mar 19, 2018 by anonymous

The magnetising current of a transformer is usually small because it has?

Last answer: The magnetising current of a transformer is usually small because it has small air gap.

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60 views 1 answer

asked May 17, 2018 by anonymous

For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary

For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary are respectively (A) ferrite : 20 : 1 (B) laminated iron : 1 :1 (C) ferrite : 1 : 1 (D) powered iron : 1: 1

Last answer: For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary are respectively ferrite : 1 : 1

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75 views 1 answer

asked Mar 19, 2018 by anonymous

The transformer ratings are usually expressed in terms of?

Last answer: The transformer ratings are usually expressed in terms of kVA.

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209 views 1 answer

asked Apr 28, 2018 by anonymous

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

Last answer: A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

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690 views 1 answer

asked Jul 26, 2019 by anonymous

Explain construction and working of single phase Auto transformer.

Last answer: Construction of single phase auto transformer: (i) It has only one winding wound on a laminated circular magnetic core. (ii) The core is made of silicon steel stampings. (iii) The two terminals of the ... help of handle. 5) The same transformer can be used as step-up or step down auto-transformer

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107 views 1 answer

asked Mar 19, 2018 by anonymous

The chemical used in breather for transformer should have the quality of?

Last answer: The chemical used in breather for transformer should have the quality of cleansing the transformer oil.

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92 views 1 answer

asked May 7, 2020 by anonymous

Explain HRGO and CRGO. State benefits of CRGO for manufacturing of core.

Last answer: i) HRGO ( Hot -rolled grain oriented steel): * To minimize the size of machine flux density should be high with small magneto motive force (MMF). Due to this iron loss will ... percentage of silicon which in turn increases the resistance compared to regular steel which reduces eddy currents.

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337 views 1 answer

asked Mar 19, 2018 by anonymous

Which type of winding is used in 3 phase shell-type transformer ?

Last answer: Sandwich type winding is used in 3 phase shell-type transformer.

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108 views 1 answer

asked Mar 21, 2018 by anonymous

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a?

Last answer: The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

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120 views 1 answer

asked Mar 20, 2018 by anonymous

When a conductor carries more current on the surface as compared to core, it is due to?

Last answer: When a conductor carries more current on the surface as compared to core, it is due to skin effect.

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116 views 1 answer

asked Apr 28, 2018 by anonymous

A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to

A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is (A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm

Last answer: A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is 2 cm

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81 views 1 answer

asked Mar 3, 2018 by anonymous

In DC generators lamination core are generally made of?

Last answer: In DC generators lamination core are generally made of silicon steel.

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127 views 1 answer

asked May 8, 2018 by anonymous

Core type transformers are popular in___________.

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

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54 views 1 answer

asked Mar 25, 2018 by anonymous

A ferrite core has less eddy current loss than an iron core because?

Last answer: A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

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280 views 1 answer

asked Mar 19, 2018 by anonymous

The main reason for generation of harmonics in a transformer could be?

Last answer: The main reason for generation of harmonics in a transformer could be saturation of core.

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69 views 1 answer

asked Mar 19, 2018 by anonymous

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Last answer: In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

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102 views 1 answer

asked Mar 19, 2018 by anonymous

For a transformer, operating at constant load current, maximum efficiency will occur at?

Last answer: For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

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89 views 1 answer

asked May 15, 2020 by anonymous

What is the use of transformer?

Last answer: The use of transformer is to do lower or raise the voltage or currents in an electrical circuit. That's quite so simple.

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138 views 1 answer

asked Jul 27, 2019 by anonymous

State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation

Last answer: Transformer A with 4% voltage regulation is better. Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

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100 views 1 answer

asked Mar 19, 2018 by anonymous

Efficiency of a power transformer is of the order of?

Last answer: The efficiency of a power transformer is of the order of 98 percent.

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60 views 1 answer

asked Mar 19, 2018 by anonymous

The maximum efficiency of a distribution transformer is?

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

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56 views 1 answer

asked Mar 19, 2018 by anonymous

An ideal transformer has infinite values of primary and secondary inductances. The statement is?

Last answer: An ideal transformer has infinite values of primary and secondary inductances. The statement is false.

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133 views 1 answer

asked Mar 19, 2018 by anonymous

The function of conservator in a transformer is?

Last answer: conservator or a reservoir tank for insulating oil in transformer which used for balanced the onload oil level with help of oil level indicator which mount on middle part of reservoir tank.

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104 views 3 answers

asked Mar 19, 2018 by anonymous

The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?

Last answer: The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.

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66 views 1 answer

asked Mar 19, 2018 by anonymous

The value of flux involved in the e.m.f. equation of a transformer is ?

Last answer: The value of flux involved in the e.m.f. equation of a transformer is maximum value.

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123 views 1 answer

asked Mar 19, 2018 by anonymous

Atmospheric temperature during day and night is taken care of by which part of the transformer?

The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?

Last answer: The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.

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44 views 1 answer

asked Mar 19, 2018 by anonymous

The function of breather in a transformer is?

Last answer: The function of breather in a transformer is to arrest flow of moisture when outside air enters the transformer.

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100 views 1 answer

asked Mar 19, 2018 by anonymous

The secondary of a current transformer is always short-circuited under operating conditions because it?

Last answer: The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.

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74 views 1 answer

asked Mar 19, 2018 by anonymous

The efficiency of a transformer, under heavy loads, is comparatively low because?

Last answer: The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.

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64 views 1 answer

asked Mar 19, 2018 by anonymous

The voltage transformation ratio of a transformer is equal to the ratio of?

Last answer: The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

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95 views 1 answer

asked Mar 19, 2018 by anonymous

Part of the transformer which is most subject to damage from overheating is?

Last answer: Part of the transformer which is most subject to damage from overheating is winding insulation.

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74 views 1 answer

asked Mar 19, 2018 by anonymous

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?

Last answer: In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.

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90 views 1 answer

anonymous · Answer 1 · 2018-03-19T21:25:08+0000

Material used for construction of transformer core is usually silicon steel.

Material used for construction of transformer core is usually?

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