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Greater the secondary leakage flux?
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Mar 19, 2018
by
anonymous
transformer
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Mar 19, 2018
by
anonymous
Greater the secondary leakage flux
less will be the secondary induced e.m.f.
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Mar 19, 2018
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The leakage flux in a transformer depends upon?
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The leakage flux in a transformer depends upon load current.
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The secondary of a current transformer is always short-circuited under operating conditions because it?
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The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.
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Mar 19, 2018
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In a transformer the resistance between its primary and secondary should be?
In a transformer the resistance between its primary and secondary should be?
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In a transformer the resistance between its primary and secondary should be infinity.
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Mar 19, 2018
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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
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The value of flux involved in the e.m.f. equation of a transformer is ?
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The value of flux involved in the e.m.f. equation of a transformer is maximum value.
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Mar 19, 2018
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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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asked
Mar 19, 2018
by
anonymous
When secondary of a current transformer is open-circuited its iron core will be?
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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asked
Oct 5, 2017
by
anonymous
is efficiency of transformer is greater than electrical machine and why?
Last answer:
The efficiency of transformer is Greater than electrical Machine because there is no rotational losses in transformer and there is no air gap losses in transformer so losses is less in transformer compare to electrical machine so efficiency is higher in case of transformer.
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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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May 8, 2018
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A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts
A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts
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A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? (A) 30 Volts (B) 480 Volts (C) 120 Volts (D) 60 Volts
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asked
Apr 29, 2018
by
anonymous
If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded
If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then (A) zero sequence currents are present on both sides of the transformer (B) zero sequence currents are absent on both sides of the transformer (C) zero sequence currents are present on the secondary side but not on the primary side (D) zero sequence currents are present on the primary side but not on the secondary side
Last answer:
If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then zero sequence currents are absent on both sides of the transformer
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May 22, 2020
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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.
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May 15, 2020
by
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What is the use of transformer?
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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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asked
Apr 28, 2020
by
anonymous
Even at no-load, a transformer draws current from the mains. Why?
Even at no-load, a transformer draws current from the mains. Why?
even
at
no-load
a
transformer
draws
current
from
the
mains
why
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0
answers
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.
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Mar 19, 2018
by
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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In the transformer which winding has got more cross-sectional area?
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In the transformer low voltage winding has got more cross-sectional area.
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Mar 19, 2018
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A transformer cannot raise or lower the voltage of a D.C. supply because?
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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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Mar 19, 2018
by
anonymous
Efficiency of a power transformer is of the order of?
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The efficiency of a power transformer is of the order of 98 percent.
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Mar 19, 2018
by
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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
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The maximum efficiency of a distribution transformer is?
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The maximum efficiency of a distribution transformer is at 50% full load.
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Mar 19, 2018
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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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279
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Mar 19, 2018
by
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The power transformer is a constant?
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The power transformer is a constant main flux device.
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42
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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.
transformer
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53
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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
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1
answer
asked
Mar 19, 2018
by
anonymous
The chemical used in breather is?
Last answer:
The chemical used in breather is silica gel.
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54
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1
answer
asked
Mar 19, 2018
by
anonymous
The transformer ratings are usually expressed in terms of?
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The transformer ratings are usually expressed in terms of kVA.
transformer
rating
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209
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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.
transformer
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65
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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.
transformer
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104
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3
answers
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.
transformer
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104
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1
answer
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.
transformer
harmonics
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69
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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.
transformer
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60
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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 .
transformer
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49
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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.
transformer
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1
answer
asked
Mar 19, 2018
by
anonymous
Which winding of the transformer has less cross-sectional area ?
Last answer:
High voltage winding of the transformer has less cross-sectional area.
transformer
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1
answer
asked
Mar 19, 2018
by
anonymous
Atmospheric temperature during day and night is taken care of by which part of the transformer?
The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?
Last answer:
The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.
transformer
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44
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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.
transformer
iron
loss
constant
load
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76
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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.
supply
frequency
transformer
increased
iron
loss
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102
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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.
transformer
lamination
insulated
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70
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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.
function
breather
transformer
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106
views
1
answer
asked
Mar 19, 2018
by
anonymous
The size of a transformer core will depend on?
The size of a transformer core will depend on?
Last answer:
The size of a transformer core will depend on frequency and area of the core.
size
transformer
core
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64
views
1
answer
asked
Mar 19, 2018
by
anonymous
The noise produced by a transformer is termed as?
The noise produced by a transformer is termed as?
Last answer:
The noise produced by a transformer is termed as hum.
noise
produced
transformer
termed
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76
views
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
views
1
answer
asked
Mar 19, 2018
by
anonymous
The maximum load that a power transformer can carry is limited by its?
The maximum load that a power transformer can carry is limited by its?
Last answer:
The maximum load that a power transformer can carry is limited by its voltage ratio.
maximum
load
power
transformer
carry
limited
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103
views
1
answer
asked
Mar 19, 2018
by
anonymous
The efficiency of a transformer, under heavy loads, is comparatively low because?
The efficiency of a transformer, under heavy loads, is comparatively low because?
Last answer:
The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.
efficiency
transformer
heavy
loads
comparatively
low
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64
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1
answer
asked
Mar 19, 2018
by
anonymous
The voltage transformation ratio of a transformer is equal to the ratio of?
The voltage transformation ratio of a transformer is equal to the ratio of?
Last answer:
The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.
voltage
transformation
ratio
transformer
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95
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1
answer
asked
Mar 19, 2018
by
anonymous
Part of the transformer which is most subject to damage from overheating is?
Part of the transformer which is most subject to damage from overheating is?
Last answer:
Part of the transformer which is most subject to damage from overheating is winding insulation.
part
transformer
subject
damage
overheating
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74
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1
answer
asked
Mar 19, 2018
by
anonymous
If a transformer is switched on to a voltage more than the rated voltage?
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.
transformer
switched
voltage
rated
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