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The size of a transformer core will depend on?
asked
Mar 19, 2018
by
anonymous
The size of a transformer core will depend on?
size
transformer
core
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1
Answer
answered
Mar 19, 2018
by
anonymous
The size of a transformer core will depend on
frequency and
area of the core.
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Related questions
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.
secondary
current
transformer
open-circuited
iron
core
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101
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1
answer
asked
Jul 27, 2019
by
anonymous
State any four characteristics of core type transformer.
State any four characteristics of core type transformer.
Last 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.
core
type
transformer
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71
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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.
transformer
core
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1
answer
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?
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.
reduction
core
losses
increase
permeability
obtained
transformer
employing
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1
answer
asked
May 8, 2018
by
anonymous
A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The
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
Last 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
kva
transformer
core
loss
full
load
copper
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1
answer
asked
May 8, 2018
by
anonymous
The core construction is like spokes of a wheel in following transformer:
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
Last answer:
The core construction is like spokes of a wheel in following transformer: Berry Type Transformer
core
construction
spokes
wheel
transformer
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103
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1
answer
asked
Apr 28, 2018
by
anonymous
The main purpose of using core in a transformer is to
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
Last answer:
The main purpose of using core in a transformer is to reduce reluctance of the common magnetic circuit
transformer
core
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1
answer
asked
Mar 14, 2018
by
anonymous
Why does the core of a transformer need to be laminated?
Why does the core of a transformer need to be laminated?
Last answer:
Transformer cores are laminated to reduce eddy current loss.
core
transformer
need
laminated
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73
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1
answer
asked
May 1, 2018
by
anonymous
The desirable properties of transformer core material are
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.
Last answer:
The desirable properties of transformer core material are high permeability and low hysteresis loss.
desirable
properties
transformer
core
material
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130
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1
answer
asked
Sep 30, 2017
by
anonymous
why the Transformer core is laminated?
Last answer:
Transformer core is laminated to reduce Eddy current losses.
transformer
core
laminated
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84
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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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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.
transformer
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1
answer
asked
Jun 18, 2018
by
anonymous
Calculate the size of memory address space for a 16 bit data and 20 bit address bus.
Calculate the size of memory address space for a 16 bit data and 20 bit address bus. A) 1 MB B) 2 MB C) 3 MB D) 4 MB
Last answer:
Calculate the size of memory address space for a 16 bit data and 20 bit address bus. A) 1 MB B) 2 MB C) 3 MB D) 4 MB
size
memory
address
space
data
bit
bus
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1
answer
asked
Apr 27, 2018
by
anonymous
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
Last answer:
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25
power
system
voltage
controlled
buses
size
jacobian
matrix
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1
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asked
Mar 20, 2018
by
anonymous
The size of a synchronous motor decreases with the increase in?
Last answer:
The size of a synchronous motor decreases with the increase in flux density.
size
synchronous
motor
decreases
increase
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136
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1
answer
asked
Mar 20, 2018
by
anonymous
When a conductor carries more current on the surface as compared to core, it is due to?
Last answer:
When a conductor carries more current on the surface as compared to core, it is due to skin effect.
conductor
carries
more
current
surface
compared
to
core
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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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1
answer
asked
Sep 7, 2018
by
anonymous
What is the choice of size and number of generator units in interconnected power system?
What is the choice of size and number of generator units in interconnected power system?
Last answer:
Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.
size
number
generator
units
interconnected
power
system
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62
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1
answer
asked
Jun 18, 2018
by
anonymous
What is the size of memory which can be accessed by direct accessing in 8085 microprocessor?
What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB
Last answer:
What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB
size
memory
8085
microprocessor
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113
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1
answer
asked
Sep 22, 2018
by
anonymous
State two factors deciding size of conduit.
State two factors deciding size of conduit.
Last answer:
Following factors deciding size of conduit: 1) Types of wiring method 2) No. of wires carried out through conduit 3) Size of wires required for sub circuits which is carried out through conduit 4) Future expansion.
state
factors
deciding
size
conduit
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267
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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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67
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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
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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96
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1
answer
asked
Mar 19, 2018
by
anonymous
For a transformer, operating at constant load current, maximum efficiency will occur at?
For a transformer, operating at constant load current, maximum efficiency will occur at?
Last answer:
For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.
transformer
operating
constant
load
current
maximum
efficiency
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89
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1
answer
asked
Apr 28, 2018
by
anonymous
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm
Last answer:
A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm
single
core
cable
phase
system
peak
voltage
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690
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1
answer
asked
Mar 20, 2018
by
anonymous
The armature core of a D.C. generator is usually made of?
Last answer:
The armature core of a D.C. generator is usually made of silicon steel.
armature
core
dc
generator
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85
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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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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
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
Apr 28, 2018
by
anonymous
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is (A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm
Last answer:
A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is 2 cm
single
core
lead
sheathed
cable
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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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277
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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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84
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1
answer
asked
Mar 25, 2018
by
anonymous
A ferrite core has less eddy current loss than an iron core because?
A ferrite core has less eddy current loss than an iron core because?
Last answer:
A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.
ferrite
core
less
eddy
current
loss
iron
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283
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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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33
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1
answer
asked
May 7, 2020
by
anonymous
Explain HRGO and CRGO. State benefits of CRGO for manufacturing of core.
Explain HRGO and CRGO. State benefits of CRGO for manufacturing of core.
Last answer:
i) HRGO ( Hot -rolled grain oriented steel): * To minimize the size of machine flux density should be high with small magneto motive force (MMF). Due to this iron loss will ... percentage of silicon which in turn increases the resistance compared to regular steel which reduces eddy currents.
explain
hrgo
and
crgo
state
benefits
of
for
manufacturing
core
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347
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1
answer
asked
Mar 3, 2018
by
anonymous
In DC generators lamination core are generally made of?
In DC generators lamination core are generally made of?
Last answer:
In DC generators lamination core are generally made of silicon steel.
dc
generators
lamination
core
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132
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1
answer
asked
May 7, 2020
by
anonymous
State the material used for making (1) Magnetic Core (2) Fuse element
State the material used for making (1) Magnetic Core (2) Fuse element
Last answer:
The material used for making of: (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel (2) Fuse Element: Tin- lead wire, Tinned copper wire
state
the
material
used
for
making
1
magnetic
core
2
fuse
element
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52
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1
answer
asked
May 10, 2020
by
anonymous
Transformer on DC
Write about transformer on DC.
Last answer:
Transformer on DC : Transformer cannot work on DC. Transformer works on electromagnetic induction principle. Electromagnetic induction principle means when flux linking with coil changes and EMF induced in it ... winding insulation will burn. https://youtu.be/TVp_0fIfxqY
transformer
on
dc
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232
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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
views
1
answer
asked
May 8, 2018
by
anonymous
Core type transformers are popular in___________.
Core type transformers are popular in___________. (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above
Last answer:
Core type transformers are popular in High voltage applications
core
type
transformers
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55
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1
answer
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
increasing
number
turns
wire
secondary
transformer
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534
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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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102
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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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137
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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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78
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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
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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67
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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
conservator
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104
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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.
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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1
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...