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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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Answer :

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

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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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113 views 1 answer
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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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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Answer :

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

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Description :

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

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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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597 views 1 answer
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
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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42 views 1 answer
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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Answer :

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

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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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Answer :

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

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Answer :

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

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Description :

Explain transformer isolated drive circuits providing both signal and power.

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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
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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115 views 1 answer
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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389 views 1 answer
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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88 views 1 answer
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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65 views 1 answer
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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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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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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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
Description :

Answer :

Transformer core is laminated to reduce Eddy current losses.

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Description :

Answer :

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

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Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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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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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
Description :

Answer :

The leakage flux in a transformer depends upon load current.

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Description :

Answer :

Noise level test in a transformer is a type test.

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Description :

Answer :

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

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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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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
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
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
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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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
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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Description :

Answer :

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

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Description :

Answer :

Transformer breaths in when load on it decreases.

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Description :

Answer :

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

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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
Description :

Answer :

The transformer ratings are usually expressed in terms of kVA.

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234 views 1 answer
Description :

Answer :

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

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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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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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