The size of a transformer core will depend on?

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asked Mar 19, 2018 by anonymous

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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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101 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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71 views 1 answer

asked Mar 19, 2018 by anonymous

Material used for construction of transformer core is usually?

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

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115 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 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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426 views 1 answer

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 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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872 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 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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130 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 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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285 views 1 answer

asked Jun 18, 2018 by anonymous

Calculate the size of memory address space for a 16 bit data and 20 bit address bus.

Calculate the size of memory address space for a 16 bit data and 20 bit address bus. A) 1 MB B) 2 MB C) 3 MB D) 4 MB

Last answer: Calculate the size of memory address space for a 16 bit data and 20 bit address bus. A) 1 MB B) 2 MB C) 3 MB D) 4 MB

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120 views 1 answer

asked Apr 27, 2018 by anonymous

For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is

Last answer: For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25

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1.8k views 1 answer

asked Mar 20, 2018 by anonymous

The size of a synchronous motor decreases with the increase in?

Last answer: The size of a synchronous motor decreases with the increase in flux density.

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136 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 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 Sep 7, 2018 by anonymous

What is the choice of size and number of generator units in interconnected power system?

Last answer: Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

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62 views 1 answer

asked Jun 18, 2018 by anonymous

What is the size of memory which can be accessed by direct accessing in 8085 microprocessor?

What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB

Last answer: What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB

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113 views 1 answer

asked Sep 22, 2018 by anonymous

State two factors deciding size of conduit.

Last answer: Following factors deciding size of conduit: 1) Types of wiring method 2) No. of wires carried out through conduit 3) Size of wires required for sub circuits which is carried out through conduit 4) Future expansion.

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267 views 1 answer

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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67 views 1 answer

asked Mar 19, 2018 by anonymous

If a transformer is continuously operated the maximum temperature rise will occur in?

Last answer: If a transformer is continuously operated the maximum temperature rise will occur in windings.

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56 views 1 answer

asked Mar 19, 2018 by anonymous

An ideal transformer will have maximum efficiency at a load such that?

Last answer: An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.

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96 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 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 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

In a transformer the tappings are generally provided on?

Last answer: In a transformer, the tappings are generally provided on low voltage side.

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53 views 1 answer

asked Mar 19, 2018 by anonymous

If a transformer is switched on to a voltage more than the rated voltage?

Last answer: If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

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70 views 1 answer

asked Mar 19, 2018 by anonymous

If the supply frequency to the transformer is increased, the iron loss will?

Last answer: If the supply frequency to the transformer is increased, the iron loss will increase.

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102 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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85 views 1 answer

asked Mar 19, 2018 by anonymous

An open-circuit test on a transformer is conducted primarily to measure?

Last answer: The open-circuit test in a transformer is used to measure

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277 views 2 answers

asked Mar 19, 2018 by anonymous

A no-load test is performed on a transformer to determine?

Last answer: A no-load test is performed on a transformer to determine magnetizing current and loss.

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84 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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283 views 1 answer

asked May 22, 2020 by anonymous

Explain the effect of Harmonics on the Transformer.

Last answer: Effect of Harmonics on the Transformer: 1. Core loss: Harmonic voltage increases the hysteresis and eddy current losses in the lamination. The amount of the core loss depends on ... small core vibrations. 5. Saturation problem: Sometimes additional harmonic voltage causes core saturation.

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33 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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347 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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132 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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52 views 1 answer

asked May 10, 2020 by anonymous

Transformer on DC

Write about transformer on DC.

Last answer: Transformer on DC : Transformer cannot work on DC. Transformer works on electromagnetic induction principle. Electromagnetic induction principle means when flux linking with coil changes and EMF induced in it ... winding insulation will burn. https://youtu.be/TVp_0fIfxqY

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232 views 1 answer

asked Mar 19, 2018 by anonymous

Sumpner's test is conducted on transformer to determine?

Last answer: Sumpner's test is conducted on transformer to determine temprature.

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92 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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55 views 1 answer

asked May 8, 2018 by anonymous

Increasing the number of turns of wire on the secondary of a transformer will

Increasing the number of turns of wire on the secondary of a transformer will (A) Decrease the secondary current (B) Increase the primary current (C) Have no effect on the secondary current (D) Increase the secondary current

Last answer: Increasing the number of turns of wire on the secondary of a transformer will Decrease the secondary current

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534 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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102 views 1 answer

asked Mar 19, 2018 by anonymous

A transformer cannot raise or lower the voltage of a D.C. supply because?

Last answer: A transformer cannot raise or lower the voltage of a D.C. supply because Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero.

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137 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 no load current in a transformer lags behind the applied voltage by an angle of about?

Last answer: The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

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78 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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58 views 1 answer

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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67 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 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

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

anonymous · Answer 1 · 2018-03-19T20:36:21+0000

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

The size of a transformer core will depend on?

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