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Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.
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Mar 10, 2018
by
anonymous
Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.
electrical
losses
magnetic
materials
used
cores
inductors
transformer
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asked
Mar 25, 2018
by
anonymous
Those magnetic materials are best suited for making armature and transformer cores which have...
Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.
Last answer:
Those magnetic materials are best suited for making armature and transformer cores which have high permeability and low hystersis loss.
magnetic
materials
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105
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1
answer
asked
Mar 25, 2018
by
anonymous
Laminated cores, in electrical machines, are used to reduce?
Laminated cores, in electrical machines, are used to reduce?
Last answer:
Laminated cores, in electrical machines, are used to reduce eddy current loss.
laminated
cores
electrical
machines
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answer
asked
Sep 4, 2018
by
anonymous
Classify magnetic materials and explain in brief.
Classify magnetic materials and explain in brief.
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { ... the absence of external magnetic field. Following are the ferromagnetic materials: Iron, Cobalt, Nickel.
classify
magnetic
materials
explain
brief
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1
answer
asked
Jan 6
by
anonymous
Magnetic and Non-magnetic Materials
Magnetic and Non-magnetic Materials
Last answer:
We have now looked at a number of ways in which matter can be grouped, such as into metals, semi-metals and non-metals; electrical conductors and insulators, and thermal conductors and insulators. ... information must be stored, in computers and TV's, as well as in generators and electric motors.
magnetic
and
non-magnetic
materials
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1
answer
asked
Mar 10, 2018
by
anonymous
Explain the electrical characteristics of transformer.
Explain the electrical characteristics of transformer.
Last answer:
Transformer electrical characteristics: Area of primary and secondary conductors, Apri and Asec: Winding loss Pw: Flux density and core loss: Leakage inductance: ... transformer span. The rise in temperature may breakdown insulation which may cause failure of the transformer.
electrical
characteristics
transformer
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69
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1
answer
asked
May 7, 2020
by
anonymous
State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them.
State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them.
Last answer:
The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.
state
the
insulating
materials
used
in
motor
write
temperature
class
and
withstand
ranges
for
them
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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?
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.
transformer
voltage
losses
constant
load
changes
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104
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1
answer
asked
Mar 11, 2018
by
anonymous
What is the meaning of electrical materials?
What is the meaning of electrical materials?
electrical
materials
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87
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0
answers
asked
Sep 4, 2018
by
anonymous
Classify electrical materials.
Classify electrical materials.
Last answer:
Classification of electrical materials: i) Conducting Materials ii) Insulating materials iii) Magnetic materials iv) Semiconducting materials
classify
electrical
materials
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58
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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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592
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1
answer
asked
May 7, 2020
by
anonymous
List any four materials used for pattern making
List any four materials used for pattern making
Last answer:
The various types of materials used are as follows: 1. Wood 2. Metal. 3. Plastic. 4. Plaster. 5. Wax.
list
any
four
materials
used
for
pattern
making
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1
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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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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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274
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1
answer
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.
transformer
efficiency
electrical
machines
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107
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3
answers
asked
Mar 10, 2018
by
anonymous
How can a magnetic field be used to generate an electric current?
How can a magnetic field be used to generate an electric current?
Last answer:
Magnetic field can be used to generate electric current on a condition that it is on a rate of changing magnetic flux. (Faraday's law)
magnetic
field
used
generate
electric
current
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89
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1
answer
asked
Sep 4, 2018
by
anonymous
State two types of inductors and give their applications.
State two types of inductors and give their applications.
Last answer:
Types of inductors: i) Air cored inductor ii) Iron cored inductor iii) Ferrite cored inductor Air cored inductor: These are used for high frequency application e.g. Radio sets ... radio receiver, wide band pulse transformers, oscillators, signal generators, high frequency amplifiers, etc.
types
inductors
give
applications
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1
answer
asked
Mar 20, 2018
by
anonymous
The inverse definite mean time relays are used for over current and earth fault protection of transformer against?
Last answer:
The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.
inverse
definite
mean
time
relays
used
over
current
earth
fault
protection
transformer
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1
answer
asked
Mar 25, 2018
by
anonymous
Silicon steel is used in electrical machines because it has?
Silicon steel is used in electrical machines because it has?
Last answer:
Silicon steel is used in electrical machines because it has low hysteresis loss.
silicon
steel
used
electrical
machines
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135
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1
answer
asked
Sep 15, 2017
by
anonymous
Explain the on state losses in power BJT.
Explain the on state losses in power BJT.
Last answer:
On state losses in power BJT: Transistor have four types of losses one is turn on state losses second is turn off state losses third is turn on switching losses and fourth is turn ... ON = VCE sat x IC With increasing collector current collector to emitter saturation voltage increases.
bjt
on
state
losses
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240
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1
answer
asked
Aug 5, 2019
by
anonymous
Define magnetic permeability. State and explain the factors affecting permeability of magnetic materials
Define magnetic permeability. State and explain the factors affecting permeability of magnetic materials
Last answer:
Permeability : The capability of the magnetic material to conduct the magnetic flux is known as permeability. Permeability and hysteresis loss are inversely related to each other. Factors ... impurities affect the geometric pattern of the crystals and are harmful to the magnetic property.
magnetic
permeability
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73
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1
answer
asked
Sep 22, 2018
by
anonymous
Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses.
Explain the “mitigation of power theft” and “faulty meter replacement” for energy conservation techniques to reduce commercial losses.
Last answer:
Energy conservation techniques to reduce commercial losses: 1. Mitigation of Power Theft: Power theft being the most important issue which all of the service providing utilities ... agricultural sector. Prepaid meters may prove effective measures against unauthorized abstraction of energy.
mitigation
power
theft
faulty
meter
replacement
energy
conservation
techniques
reduce
commercial
losses
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68
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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.
type
winding
used
phase
shell-type
transformer
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108
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1
answer
asked
Apr 30, 2018
by
anonymous
IDMT relays are used to protect the transformer against :
IDMT relays are used to protect the transformer against : (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage
Last answer:
IDMT relays are used to protect the transformer against : External short circuits
idmt
relays
used
protect
transformer
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2.7k
views
1
answer
asked
May 7, 2020
by
anonymous
Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.
Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.
Last answer:
Parts Insulating Materials Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils. ... Transformer bushings Porcelain Insulation between transmission line and pole. Porcelain
heating
element
and
base
plate
of
electric
iron
ii
used
over
copper
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68
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1
answer
asked
Feb 16, 2018
by
anonymous
Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.
Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.
Last answer:
Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:
explain
hysteresis
loss
eddy
current
skin
effect
limitations
magnetic
material
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533
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1
answer
asked
Mar 19, 2018
by
anonymous
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?
Last answer:
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.
auto-transformer
effective
saving
copper
losses
transformation
ratio
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78
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1
answer
asked
Sep 22, 2018
by
anonymous
Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).
Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).
Last answer:
(i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.
energy
conservation
transmission
distribution
system
balancing
phase
currents
variable
technical
losses
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108
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1
answer
asked
Apr 30, 2018
by
anonymous
_________ is used for heating non -conducting materials.
_______ is used for heating non -conducting materials. (1) Eddy current heating (2) Arc heating (3) Induction heating (4) Dielectric heating
Last answer:
Dielectric heating is used for heating non -conducting materials.
heating
non-conducting
materials
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2.6k
views
1
answer
asked
Aug 10, 2018
by
anonymous
State and explain Ohm's law for magnetic circuit.
State and explain Ohm's law for magnetic circuit.
Last answer:
Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.
ohms
law
magnetic
circuit
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470
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1
answer
asked
Mar 25, 2018
by
anonymous
Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.
Those materials are well suited for making permanent magnets which have _____ retentivity and _______ coercivity.
Last answer:
Those materials are well suited for making permanent magnets which have high retentivity and high coercivity.
materials
permanent
magnets
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0
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338
views
1
answer
asked
Sep 4, 2018
by
anonymous
Explain the mechanical properties of insulating materials.
Explain the mechanical properties of insulating materials.
Last answer:
i) Mechanical strength: Mechanical strength depends on temperature and humidity. a) Temperature: High temperature badly affects the mechanical strength of insulating material. While selecting material ... material should have property of easy moulding and machined into required shape and size.
mechanical
properties
insulating
materials
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40
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1
answer
asked
Apr 28, 2018
by
anonymous
The bridge most suited for accurate measurement of relative permittivity of dielectric materials is
The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.
Last answer:
The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.
bridge
accurate
measurement
relative
permittivity
dielectric
materials
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86
views
1
answer
asked
Mar 19, 2018
by
anonymous
Losses which occur in rotating electric machines and do not occur in transformers are?
Losses which occur in rotating electric machines and do not occur in transformers are?
Last answer:
Friction losses windage losses
losses
rotating
electric
machines
transformers
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108
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2
answers
asked
Mar 11, 2018
by
anonymous
Explain transformer isolated drive circuits providing both signal and power.
Explain transformer isolated drive circuits providing both signal and power.
transformer
isolated
drive
circuits
signal
power
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71
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0
answers
asked
Sep 6, 2018
by
anonymous
What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.
What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.
Last answer:
1. Error due to stray magnetic fields- Main magnetic field gets disturbed by external magnetic fields known as stray magnetic fields. 2. Compensation technique To avoid this error, ... resistance alloy having a negligible resistance temp coefficient in the ratio of 1:10 for pressure coil
errors
measuring
devices
stray
magnetic
field
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59
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1
answer
asked
Apr 27, 2020
by
anonymous
Explain with neat diagram series and parallel magnetic circuits.
Explain with neat diagram series and parallel magnetic circuits.
Last answer:
Series magnetic circuit: When different magnetic materials having different lengths, cross sectional areas and permeability are connected one after another, in which same flux is established in different sections, then it is called series ... flux, Φ = Φ1 + Φ2 Path 1: BAFE Path 2: BACD
diagram
series
parallel
magnetic
circuits
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64
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1
answer
asked
May 7, 2020
by
anonymous
State the type of insulating materials under Class Y and Class B.
State the type of insulating materials under Class Y and Class B.
Last answer:
The type of insulating materials under Class Y : 1. Cotton 2. Silk 3. Paper 4. Rubber 5. PVC The type of insulating materials under Class B: 1. Backelite 2. Impregnated varnish 3. Mica 4. Fiber glass 5. Asbestos
state
the
type
of
insulating
materials
under
class
y
and
b
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53
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1
answer
asked
Aug 17, 2019
by
anonymous
Name safety tools used in industry for electrical wiring.
Name safety tools used in industry for electrical wiring.
Last answer:
Safety tools used in industry for electrical wiring : 1) Hand gloves 2) Goggles 3) Rubber mats 4) Fire extinguishers 5) Danger notice plates 6) Search lights 7) Safety shoes or Gumboots 8) Ear plugs ... belts 13) Safety mask 14) Fire buckets 15) First aid box 16) Insulating stick or discharge rod
electrical
wiring
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42
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1
answer
asked
Apr 29, 2018
by
anonymous
Which of the following can reduce the Eddy current losses?
Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage D) None of these
Last answer:
Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage D) None of these
eddy
current
losses
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63
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1
answer
asked
Mar 20, 2018
by
anonymous
The total losses in a well designed D.C. generator of 10 kW will be nearly?
Last answer:
The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.
losses
dc
generator
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97
views
1
answer
asked
Mar 8, 2018
by
anonymous
What are the types of power losses in inductor?
What are the types of power losses in inductor?
Last answer:
Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.
types
power
losses
inductor
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93
views
1
answer
asked
Mar 8, 2018
by
anonymous
What is the percentage of stray losses in DC machine?
What is the percentage of stray losses in DC machine?
Last answer:
Percentage of stray losses in DC machine is about 1 % .
percentage
stray
losses
dc
machine
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90
views
1
answer
asked
Mar 20, 2018
by
anonymous
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for?
Last answer:
As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.
hysteresis
motors
mechanical
magnetic
vibrations
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90
views
1
answer
asked
Mar 6, 2018
by
anonymous
can induction heating is use for both magnetic and non magnetic material ?
Last answer:
Yes, Induction heating is used for both magnetic and non-magnetic materials.
induction
heating
magnetic
non
material
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76
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1
answer
asked
Mar 20, 2018
by
anonymous
Iron losses in a D.C. machine are independent of variations in?
Last answer:
Iron losses in a D.C. machine are independent of variations in load.
iron
losses
dc
machine
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111
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1
answer
asked
Mar 20, 2018
by
anonymous
In case of D.C. machines, mechanical losses are primary function of?
Last answer:
In case of D.C. machines, mechanical losses are primary function of speed.
mechanical
losses
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172
views
1
answer
asked
May 3, 2020
by
anonymous
State the losses in secondary distribution system.
State the losses in secondary distribution system.
Last answer:
The losses in secondary distribution system: a) Technical losses: 1. Due to poor voltage 2. Due to unbalance load 3. Due poor quality of transformer & its components 4. Due to poor quality ... of induction type of energy meter. 3. Lack of administration. 4. Energy theft 5. Unmetered supply
state
the
losses
in
secondary
distribution
system
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53
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1
answer
asked
May 8, 2018
by
anonymous
The friction losses in Real Transformers are :
The friction losses in Real Transformers are : (A) 0% (B) 5% (C) 25% (D) 50%
Last answer:
A
friction
losses
real
transformers
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2.5k
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2
answers
asked
Mar 20, 2018
by
anonymous
In a D.C. generator, the iron losses mainly take place in?
Last answer:
In a D.C. generator, the iron losses mainly take place in armature rotor.
dc
generator
iron
losses
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239
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1
answer
asked
Mar 10, 2018
by
anonymous
What are the losses in a transmission line?
What are the losses in a transmission line?
losses
transmission
line
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50
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0
answers
...