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The transformer ratings are usually expressed in terms of?
asked
Mar 19, 2018
by
anonymous
transformer
rating
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answered
Mar 19, 2018
by
anonymous
The transformer ratings are usually expressed in terms of
kVA.
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May 8, 2018
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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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The fuse rating is expressed in terms of current.
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Aug 12, 2018
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Why Transformer rating is given in kVA?
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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May 8, 2018
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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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Aug 12, 2018
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anonymous
Define kVA rating of transformer.
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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Apr 29, 2018
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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
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Mar 19, 2018
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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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1
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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 .
transformer
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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
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Mar 19, 2018
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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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Mar 19, 2018
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Material used for construction of transformer core is usually?
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Material used for construction of transformer core is usually silicon steel.
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asked
Mar 19, 2018
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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?
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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1
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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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asked
Mar 19, 2018
by
anonymous
Reduction in core losses and increase in permeability are obtained with transformer employing?
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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asked
Mar 19, 2018
by
anonymous
In a power or distribution transformer about 10 percent end turns are heavily insulated?
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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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Mar 21, 2018
by
anonymous
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a?
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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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1
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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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Apr 30, 2018
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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
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Breaking capacity of a circuit breaker is usually expressed in terms of MVA
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Mar 31, 2018
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Resistivity is usually expressed in terms of
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Ohms/cm-cube.
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Mar 19, 2018
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anonymous
The purpose of providing an iron core in a transformer is to?
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The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.
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Mar 19, 2018
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The no load current in a transformer lags behind the applied voltage by an angle of about?
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The no load current in a transformer lags behind the applied voltage by an angle of about 75°.
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Mar 19, 2018
by
anonymous
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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Mar 19, 2018
by
anonymous
The use of higher flux density in the transformer design?
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The use of higher flux density in the transformer design reduces weight per kVA.
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Mar 19, 2018
by
anonymous
The chemical used in breather for transformer should have the quality of?
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The chemical used in breather for transformer should have the quality of cleansing the transformer oil.
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Mar 19, 2018
by
anonymous
The function of conservator in a transformer is?
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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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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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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
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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
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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?
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
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1
answer
asked
Mar 19, 2018
by
anonymous
The path of magnetic flux in a transformer should have?
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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flux
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259
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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
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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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used
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shell-type
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108
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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.
transformer
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1
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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.
transformer
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103
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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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iron
loss
constant
load
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1
answer
asked
Mar 19, 2018
by
anonymous
In a transformer the resistance between its primary and secondary should be?
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.
transformer
resistance
between
primary
secondary
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96
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1
answer
asked
Mar 19, 2018
by
anonymous
If a transformer is continuously operated the maximum temperature rise will occur in?
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.
transformer
continuously
operated
maximum
temperature
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56
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1
answer
asked
Mar 19, 2018
by
anonymous
The hum in a transformer is mainly attributed to?
The hum in a transformer is mainly attributed to?
Last answer:
The hum in a transformer is mainly attributed to magnetostriction.
hum
transformer
mainly
attributed
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86
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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°.
transformer
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60
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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.
transformer
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89
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1
answer
asked
Mar 19, 2018
by
anonymous
Transformer breaths in when?
Last answer:
Transformer breaths in when load on it decreases.
transformer
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64
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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.
transformer
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70
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1
answer
asked
Mar 19, 2018
by
anonymous
what do not change in transformer?
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.
change
transformer
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76
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1
answer
asked
May 22, 2020
by
anonymous
Explain the effect of Harmonics on the Transformer.
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.
harmonics
transformer
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31
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1
answer
asked
May 15, 2020
by
anonymous
What is the use of transformer?
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.
use
transformer
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138
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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
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.
transformer
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100
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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.
transformer
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132
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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.
transformer
efficiency
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60
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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.
transformer
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56
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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.
transformer
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