The transformer ratings are usually expressed in terms of?

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asked Mar 19, 2018 by anonymous

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asked May 8, 2018 by anonymous

The rating of transformer may be expressed in ____________.

The rating of transformer may be expressed in ____________. (A) kVAR (B) kW (C) kVA (D) Horse power

Last answer: The rating of transformer may be expressed in kVA .

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asked Mar 20, 2018 by anonymous

The fuse rating is expressed in terms of?

Last answer: The fuse rating is expressed in terms of current.

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asked Aug 12, 2018 by anonymous

Why Transformer rating is given in kVA?

Last answer: 1) The output of transformer is limited by heating due to the losses. Two types of losses in the transformer (i) Iron loss, (ii) Copper loss. 2) Iron loss depends on the transformer voltage (V). ... by load power factor. - Hence the transformer output is expressed in VA or kVA and not in kW.

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2.7k views 4 answers

asked May 8, 2018 by anonymous

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be :

The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above

Last answer: The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA

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128 views 1 answer

asked Aug 12, 2018 by anonymous

Define kVA rating of transformer.

Last answer: kVA rating of transformer is defined as the product of voltage (V) and current (I) on primary side of transformer or secondary side of transformer divided by 1000. On both side the VA rating remains ... Mathematically kVA rating is given by, kVA rating of transformer = V1I1/1000 =V2I2/1000

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141 views 1 answer

asked Apr 29, 2018 by anonymous

Boiler rating is usually defined in terms of

Boiler rating is usually defined in terms of (1) Maximum temperature of steam in Kelvin (2) Heat transfer rate in KJ/hr (3) Heat transfer area in metre2 (4) Steam output in kg/hr

Last answer: Boiler rating is usually defined in terms of Steam output in kg/hr

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156 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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64 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 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 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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111 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

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

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 Mar 19, 2018 by anonymous

In a power or distribution transformer about 10 percent end turns are heavily insulated?

Last 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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69 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 19, 2018 by anonymous

The transformer laminations are insulated from each other by?

Last answer: The transformer laminations are insulated from each other by thin coat of varnish.

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70 views 1 answer

asked Apr 30, 2018 by anonymous

Breaking capacity of a circuit breaker is usually expressed in terms of

Breaking capacity of a circuit breaker is usually expressed in terms of (1) Ampere (2) Volts (3) MW (4) MVA

Last answer: Breaking capacity of a circuit breaker is usually expressed in terms of MVA

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146 views 1 answer

asked Mar 31, 2018 by anonymous

Resistivity is usually expressed in terms of

Last answer: Ohms/cm-cube.

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352 views 2 answers

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 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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77 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

The use of higher flux density in the transformer design?

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

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86 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 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 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

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

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

asked Mar 19, 2018 by anonymous

The path of magnetic flux in a transformer should have?

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

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259 views 1 answer

asked Mar 19, 2018 by anonymous

Which winding in a transformer has more number of turns ?

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

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105 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 19, 2018 by anonymous

In the transformer which winding has got more cross-sectional area?

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

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133 views 1 answer

asked Mar 19, 2018 by anonymous

The leakage flux in a transformer depends upon?

Last answer: The leakage flux in a transformer depends upon load current.

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103 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?

Last 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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74 views 1 answer

asked Mar 19, 2018 by anonymous

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

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

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96 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

The hum in a transformer is mainly attributed to?

Last answer: The hum in a transformer is mainly attributed to magnetostriction.

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86 views 1 answer

asked Mar 19, 2018 by anonymous

No-load current in a transformer?

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

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60 views 1 answer

asked Mar 19, 2018 by anonymous

In a transformer routine efficiency depends upon?

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

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89 views 1 answer

asked Mar 19, 2018 by anonymous

Transformer breaths in when?

Last answer: Transformer breaths in when load on it decreases.

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64 views 1 answer

asked Mar 19, 2018 by anonymous

Noise level test in a transformer is a?

Last answer: Noise level test in a transformer is a type test.

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70 views 1 answer

asked Mar 19, 2018 by anonymous

what do not change in transformer?

Last 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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76 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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31 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

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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132 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

anonymous · Answer 1 · 2018-03-19T21:27:12+0000

answered Mar 19, 2018 by anonymous

The transformer ratings are usually expressed in terms of kVA.

The transformer ratings are usually expressed in terms of?

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