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

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

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asked Mar 19, 2018 by anonymous
The purpose of providing an iron core in a transformer is to?
Description :

Answer :

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

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asked Mar 19, 2018 by anonymous
When secondary of a current transformer is open-circuited its iron core will be?
Description :

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

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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asked Apr 28, 2018 by anonymous
The main purpose of using core in a transformer is to
Description :

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

Answer :

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

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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?
Description :

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

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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asked Mar 19, 2018 by anonymous
The core used in high frequency transformer is usually?
Description :

Answer :

The core used in high frequency transformer is usually air core .

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62 views 1 answer
asked Mar 19, 2018 by anonymous
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?

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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asked Mar 19, 2018 by anonymous
The size of a transformer core will depend on?
Description :

The size of a transformer core will depend on?

Answer :

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

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83 views 1 answer
asked May 8, 2018 by anonymous
A Step Up transformer :
Description :

A Step Up transformer :  (A) Steps up the level of Voltage (B) Steps down the level of current (C) Step up the level of Frequency (D) (a) and (b) only

Answer :

A Step Up transformer : (A) Steps up the level of Voltage (B) Steps down the level of current (C) Step up the level of Frequency (D) (a) and (b) only

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asked Jul 27, 2019 by anonymous
State any four characteristics of core type transformer.
Description :

State any four characteristics of core type transformer.

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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asked Mar 19, 2018 by anonymous
Material used for construction of transformer core is usually?
Description :

Answer :

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

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141 views 1 answer
asked Mar 19, 2018 by anonymous
In an actual transformer the iron loss remains practically constant from no load to full load because?
Description :

Answer :

In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

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85 views 1 answer
asked Mar 19, 2018 by anonymous
Iron loss of a transformer can be measured by?
Description :

Answer :

Iron loss of a transformer can be measured by low power factor wattmeter.

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66 views 1 answer
asked Mar 19, 2018 by anonymous
If the supply frequency to the transformer is increased, the iron loss will?
Description :

Answer :

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

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asked Mar 11, 2018 by anonymous
Explain transformer isolated drive circuits providing both signal and power.
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Explain transformer isolated drive circuits providing both signal and power.

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asked May 14, 2018 by anonymous
In a step-up or step-down transformer, electrical power is transferred from one circuit to another without change in
Description :

In a step-up or step-down transformer, electrical power is transferred from one circuit to another without change in

Answer :

In a step-up or step-down transformer, electrical power is transferred from one circuit to another without change in frequency

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662 views 1 answer
asked May 8, 2018 by anonymous
The core construction is like spokes of a wheel in following transformer:
Description :

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

Answer :

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

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asked May 22, 2018 by anonymous
Three phase step-up transformer installed at power house, just before commencement of transmission line, have:
Description :

Three phase step-up transformer installed at power house, just before commencement of transmission line, have:

Answer :

Three phase step-up transformer installed at power house, just before commencement of transmission line, have: star delta connections

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asked May 8, 2018 by anonymous
Step-down transformer converts high voltage and low current into:
Description :

Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Answer :

Step-down transformer converts high voltage and low current into: Low voltage and high current

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asked Mar 10, 2018 by anonymous
Explain the single pass transformer design procedure step by step by giving its flowchart.
Description :

Explain the single pass transformer design procedure step by step by giving its flowchart.

Answer :

single pass transformer design procedure step by step by giving its flowchart:

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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
Description :

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

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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512 views 1 answer
asked Mar 14, 2018 by anonymous
Why does the core of a transformer need to be laminated?
Description :

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

Answer :

Transformer cores are laminated to reduce eddy current loss.

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83 views 1 answer
asked Mar 19, 2018 by anonymous
During short circuit test iron losses are negligible because?
Description :

During short circuit test iron losses are negligible because?

Answer :

During short circuit test iron losses are negligible because the voltage applied on primary side is low.

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89 views 1 answer
asked May 1, 2018 by anonymous
The desirable properties of transformer core material are
Description :

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.

Answer :

The desirable properties of transformer core material are high permeability and low hysteresis loss.

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159 views 1 answer
asked Sep 30, 2017 by anonymous
why the Transformer core is laminated?
Description :

Answer :

Transformer core is laminated to reduce Eddy current losses.

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95 views 1 answer
asked Mar 19, 2018 by anonymous
No-load current in a transformer?
Description :

Answer :

No-load current in a transformer lags behind the voltage by about 75°.

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asked Mar 19, 2018 by anonymous
Which winding in a transformer has more number of turns ?
Description :

Answer :

High voltage winding in a transformer has more number of turns.

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152 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?
Description :

Answer :

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

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97 views 1 answer
asked Mar 19, 2018 by anonymous
In a transformer routine efficiency depends upon?
Description :

Answer :

In a transformer, routine efficiency depends upon load current and power factor of load.

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101 views 1 answer
asked Mar 19, 2018 by anonymous
In a transformer the tappings are generally provided on?
Description :

Answer :

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

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70 views 1 answer
asked Mar 19, 2018 by anonymous
The thickness of laminations used in a transformer is usually?
Description :

Answer :

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

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74 views 1 answer
asked Mar 19, 2018 by anonymous
The function of conservator in a transformer is?
Description :

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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113 views 3 answers
asked Mar 19, 2018 by anonymous
The main reason for generation of harmonics in a transformer could be?
Description :

Answer :

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

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93 views 1 answer
asked Mar 19, 2018 by anonymous
The leakage flux in a transformer depends upon?
Description :

Answer :

The leakage flux in a transformer depends upon load current.

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146 views 1 answer
asked Mar 19, 2018 by anonymous
Noise level test in a transformer is a?
Description :

Answer :

Noise level test in a transformer is a type test.

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82 views 1 answer
asked Mar 19, 2018 by anonymous
The value of flux involved in the e.m.f. equation of a transformer is ?
Description :

Answer :

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

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206 views 1 answer
asked Mar 19, 2018 by anonymous
The function of breather in a transformer is?
Description :

Answer :

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

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134 views 1 answer
asked Mar 19, 2018 by anonymous
In a power or distribution transformer about 10 percent end turns are heavily insulated?
Description :

Answer :

In a power or distribution transformer about 10 percent end turns are heavily insulated to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns.

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79 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?
Description :

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

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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125 views 1 answer
asked Mar 19, 2018 by anonymous
In a transformer the resistance between its primary and secondary should be?
Description :

In a transformer the resistance between its primary and secondary should be?

Answer :

In a transformer the resistance between its primary and secondary should be infinity.

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116 views 1 answer
asked Mar 19, 2018 by anonymous
If a transformer is continuously operated the maximum temperature rise will occur in?
Description :

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

Answer :

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

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60 views 1 answer
asked Mar 19, 2018 by anonymous
The hum in a transformer is mainly attributed to?
Description :

The hum in a transformer is mainly attributed to?

Answer :

The hum in a transformer is mainly attributed to magnetostriction.

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93 views 1 answer
asked Mar 19, 2018 by anonymous
The path of magnetic flux in a transformer should have?
Description :

The path of magnetic flux in a transformer should have?

Answer :

The path of magnetic flux in a transformer should have low reluctance.

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304 views 1 answer
asked Mar 19, 2018 by anonymous
In the transformer which winding has got more cross-sectional area?
Description :

Answer :

In the transformer low voltage winding has got more cross-sectional area.

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147 views 1 answer
asked Mar 19, 2018 by anonymous
Transformer breaths in when?
Description :

Answer :

Transformer breaths in when load on it decreases.

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76 views 1 answer
asked Mar 19, 2018 by anonymous
The use of higher flux density in the transformer design?
Description :

Answer :

The use of higher flux density in the transformer design reduces weight per kVA.

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100 views 1 answer
asked Mar 19, 2018 by anonymous
The chemical used in breather for transformer should have the quality of?
Description :

Answer :

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

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120 views 1 answer
asked Mar 19, 2018 by anonymous
The transformer ratings are usually expressed in terms of?
Description :

Answer :

The transformer ratings are usually expressed in terms of kVA.

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234 views 1 answer
asked Mar 19, 2018 by anonymous
Which type of winding is used in 3 phase shell-type transformer ?
Description :

Answer :

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

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114 views 1 answer
asked Mar 19, 2018 by anonymous
what do not change in transformer?
Description :

what do not change in transformer?

Answer :

Frequency and power are constant in transformers. Suppose we apply 50 Hz input frequency then the output frequency will also be 50 Hz whether the transformer is step up or step down. Similar ... is decreased on secondary side and hence power on primary side and secondary side remains constant.

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93 views 1 answer
asked May 22, 2020 by anonymous
State why a transformer always have an efficiency of more than 90%.
Description :

State why a transformer always have an efficiency of more than 90%.

Answer :

As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.

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34 views 1 answer
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