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A transformer can have regulation closer to zero?
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Mar 19, 2018
by
anonymous
transformer
regulation
closer
zero
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answered
Mar 19, 2018
by
anonymous
A transformer can have regulation closer to zero
on leading power factor.
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asked
Mar 19, 2018
by
anonymous
A good voltage regulation of a transformer means?
A good voltage regulation of a transformer means?
Last answer:
A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.
good
voltage
regulation
transformer
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1
answer
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Mar 19, 2018
by
anonymous
A ferro resonant transformer regulation is also known as?
A ferro resonant transformer regulation is also known as?
Last answer:
A ferro resonant transformer regulation is also known as constant current transformer.
ferro
resonant
transformer
regulation
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1
answer
asked
Apr 30, 2018
by
anonymous
A transformer has negative voltage regulation when its load power factor is
A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging
Last answer:
Leading
transformer
negative
voltage
regulation
load
power
factor
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Mar 19, 2018
by
anonymous
Negative voltage regulation is indicative that the load is?
Negative voltage regulation is indicative that the load is?
Last answer:
Negative voltage regulation is indicative that the load is capacitive.
negative
voltage
regulation
indicative
load
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109
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1
answer
asked
Mar 19, 2018
by
anonymous
Minimum voltage regulation occurs when the power factor of the load is?
Minimum voltage regulation occurs when the power factor of the load is?
Last answer:
Minimum voltage regulation occurs when the power factor of the load is leading.
minimum
voltage
regulation
power
factor
load
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1
answer
asked
Mar 14, 2018
by
anonymous
Can the electric field between two positive charges be zero?
Can the electric field between two positive charges be zero?
Last answer:
It can only if they have equal charges.
electric
field
positive
charges
zero
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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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1
answer
asked
Mar 17, 2018
by
anonymous
The magnetic factor required to reduce the residual magnetization zero is called?
The magnetic factor required to reduce the residual magnetization zero is called?
magnetic
factor
reduce
residual
magnetization
zero
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answers
asked
Sep 7, 2018
by
anonymous
Classify hydro-electric power plants according to water flow regulation and explain in brief.
Classify hydro-electric power plants according to water flow regulation and explain in brief.
Last answer:
Classification of hydro-electric power plants according to water flow regulation of water flow:- 1. Large reservoir power plant 2. Run-off river (ROR) power plant with poundage 3. Run-off River ... depends upon rate of flow of water Initial cost is less Its purpose is to generate electricity.
hydro-electric
power
plants
according
water
flow
regulation
brief
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51
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1
answer
asked
May 22, 2020
by
anonymous
State why a transformer always have an efficiency of more than 90%.
State why a transformer always have an efficiency of more than 90%.
Last 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%.
transformer
efficiency
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1
answer
asked
Mar 19, 2018
by
anonymous
An ideal transformer will have maximum efficiency at a load such that?
Last answer:
An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.
ideal
transformer
maximum
efficiency
load
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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.
magnetic
flux
transformer
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275
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1
answer
asked
Apr 30, 2018
by
anonymous
Identify the increasing order of voltage regulation of the following dc generators a same load :
Identify the increasing order of voltage regulation of the following dc generators a same load : (A) differential compound, shunt and under compound (B) shunt, differential compound and under compound (C) under compound, shunt and differential compound (D) shunt, under compound and differential compound
Last answer:
Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound
voltage
regulation
dc
generators
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85
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1
answer
asked
Apr 29, 2018
by
anonymous
The unit of speed regulation of a governor is :
The unit of speed regulation of a governor is : (A) Hz (B) Hz/MW (C) Hz/MVA (D) rpm/MVAR
Last answer:
The unit of speed regulation of a governor is : Hz/MW
unit
speed
regulation
governor
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1
answer
asked
Apr 29, 2018
by
anonymous
Which of the following has nearly zero temperature coefficient?
Which of the following has nearly zero temperature coefficient? A) Constantan B) Manganin C) Both A and B D) None of these
Last answer:
Which of the following has nearly zero temperature coefficient? A) Constantan B) Manganin C) Both A and B D) None of these
zero
temperature
coefficient
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55
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1
answer
asked
Apr 26, 2018
by
anonymous
ln HRC fuse the time between cut-off and final current zero is called
ln HRC fuse the time between cut-off and final current zero is called
Last answer:
ln HRC fuse the time between cut-off and final current zero is called the arcing time
hrc
fuse
time
between
cut-off
final
current
zero
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110
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1
answer
asked
Mar 14, 2018
by
anonymous
Is electric potential zero when electric field is zero?
Is electric potential zero when electric field is zero?
Last answer:
Yes .If electric field is zero then electric potential is zero , not even one.
electric
potential
field
zero
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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.
transformer
breather
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96
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1
answer
asked
Jul 24, 2019
by
anonymous
Define line regulation and load regulation.
Define line regulation and load regulation.
Last answer:
Load regulation is the ability of the power supply to maintain its specified output voltage over changes in the load. Line regulation is the ability of the power supply to maintain its specified output voltage over changes in the input line voltage.
line
regulation
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3
answers
asked
Sep 5, 2018
by
anonymous
Define load and line regulation.
Define load and line regulation.
Last answer:
1. Load regulation : The load regulation indicates how much the load voltage changes when the load current changes. The load regulation is defined as: % Load regulation = (VNL-VFL) / VFL *100 ... the power supply. A well-regulated power supply can have a line regulation of less than 0.1%.
define
load
line
regulation
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1
answer
asked
Mar 20, 2018
by
anonymous
The voltage regulation in magnetic amplifier type voltage regulator is effected by?
Last answer:
The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.
voltage
regulation
magnetic
amplifier
type
regulator
effected
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83
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1
answer
asked
Mar 15, 2018
by
anonymous
Which motor has the best speed regulation?
Which motor has the best speed regulation?
motor
speed
regulation
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44
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0
answers
asked
Mar 19, 2018
by
anonymous
Iron loss of a transformer can be measured by?
Last answer:
Iron loss of a transformer can be measured by low power factor wattmeter.
iron
loss
transformer
measured
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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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104
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1
answer
asked
May 22, 2018
by
anonymous
In a transformer the voltage regulation will be zero when it operates at
In a transformer the voltage regulation will be zero when it operates at (A) unity p.f. (B) leading p.f. (C) lagging p.f. D) zero p.f. leading.
Last answer:
In a transformer the voltage regulation will be zero when it operates at leading p.f.
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1
answer
asked
May 13, 2018
by
anonymous
In a transformer, zero voltage regulation at full load is
In a transformer, zero voltage regulation at full load is (a)Not possible (b) Possible at unity power factor load (c) Possible at leading power factor load (d) Possible at lagging power factor load
Last answer:
In a transformer, zero voltage regulation at full load is Possible at leading power factor load
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225
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1
answer
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.
transformer
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84
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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
An open-circuit test on a transformer is conducted primarily to measure?
An open-circuit test on a transformer is conducted primarily to measure?
Last answer:
The open-circuit test in a transformer is used to measure
open-circuit
test
transformer
conducted
primarily
measure
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284
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2
answers
asked
Mar 19, 2018
by
anonymous
A no-load test is performed on a transformer to determine?
A no-load test is performed on a transformer to determine?
Last answer:
A no-load test is performed on a transformer to determine magnetizing current and loss.
no-load
test
transformer
determine
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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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100
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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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70
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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.
transformer
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105
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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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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
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
Sumpner's test is conducted on transformer to determine?
Sumpner's test is conducted on transformer to determine?
Last answer:
Sumpner's test is conducted on transformer to determine temprature.
sumpners
test
conducted
transformer
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92
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1
answer
asked
Mar 19, 2018
by
anonymous
The dielectric strength of transformer oil is expected to be?
The dielectric strength of transformer oil is expected to be?
Last answer:
The dielectric strength of transformer oil is expected to be 33 kV.
dielectric
strength
transformer
oil
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119
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1
answer
asked
Apr 28, 2018
by
anonymous
If a 5-bus test system contains 6 transmission lines and one transformer, how many non- zero elements are
If a 5-bus test system contains 6 transmission lines and one transformer, how many non-zero elements are there in the system Y-bus ? (A) 25 (B) 12 (C) 11 (D) 19
Last answer:
If a 5-bus test system contains 6 transmission lines and one transformer, 19 non-zero elements are there in the system Y-bus.
test
system
contains
transmission
lines
transformer
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1
answer
asked
Apr 27, 2018
by
anonymous
To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?
To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?
Last answer:
To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ? Δ-Δ connection
protect
power
transformer
neutral
grounded
fault
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318
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1
answer
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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73
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0
answers
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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61
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.
transformer
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139
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1
answer
asked
Mar 19, 2018
by
anonymous
Primary winding of a transformer?
Last answer:
Primary winding of a transformer could either be a low voltage or high voltage winding.
transformer
primary
winding
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62
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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.
transformer
turns
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116
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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 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°.
transformer
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79
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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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91
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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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58
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1
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asked
Mar 19, 2018
by
anonymous
No-load current of a transformer has?
Last answer:
No-load current of a transformer has small magnitude and low power factor.
transformer
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