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How eddy currents are generated?
asked
Mar 14, 2018
by
anonymous
How eddy currents are generated?
eddy
currents
generated
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asked
Mar 20, 2018
by
anonymous
Eddy currents are induced in the pole shoes of a D.C. machine due to?
Last answer:
Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.
dc
eddy
currents
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asked
Jun 29, 2019
by
anonymous
List at least two examples that show how static electricity can be generated.
List at least two examples that show how static electricity can be generated.
Last answer:
Examples of how static electricity can be generated include combing your hair, walking across a carpeted room, or sliding two pieces of plastic across each other.
list
at
least
two
examples
that
show
how
static
electricity
can
be
generated
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asked
Sep 7, 2018
by
anonymous
Explain how sinusoidal AC voltage is generated by using simple one loop generator.
Explain how sinusoidal AC voltage is generated by using simple one loop generator.
Last answer:
An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform.
sinusoidal
ac
voltage
generated
simple
loop
generator
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asked
Mar 25, 2018
by
anonymous
The transient currents are associated with the?
The transient currents are associated with the?
Last answer:
The transient currents are associated with the changes in the stored energy in the inductors and capacitors.
transient
currents
associated
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asked
Mar 15, 2018
by
anonymous
How eddy current can be minimized?
How eddy current can be minimized?
eddy
current
minimized
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asked
Mar 15, 2018
by
anonymous
How eddy current is produced in a transformer?
How eddy current is produced in a transformer?
eddy
current
transformer
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answers
asked
Mar 21, 2018
by
anonymous
For handling greater currents induction wattmeters are used in conjunction with?
Last answer:
For handling greater currents induction wattmeters are used in conjunction with current transformers.
currents
induction
wattmeters
used
conjunction
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1
answer
asked
Mar 10, 2018
by
anonymous
Why harmonics are generated in electrical system?
Why harmonics are generated in electrical system?
harmonics
generated
electrical
system
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0
answers
asked
Sep 8, 2018
by
anonymous
State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.
State the types of radioactive waste generated in a nuclear power station. Explain the methods employed for their disposal.
Last answer:
Types of radioactive waste: The waste produced in nuclear power plant is in the form of solid, liquid & gases, 1. Solid Waste Disposal:- Solid wastes removed from the reactor are very ... are measured. If it is safe then released to atmosphere at high level through large height chimney.
radioactive
waste
generated
nuclear
power
station
disposal
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asked
Sep 10, 2017
by
anonymous
where electricity is generated?
Last answer:
Electricity is generated at electrical power generation station.
electricity
generated
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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
Mar 21, 2018
by
anonymous
In a single phase power factor meter the phase difference between the currents in the two pressure coils is?
Last answer:
In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.
single
phase
power
factor
meter
difference
between
currents
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1
answer
asked
Mar 20, 2018
by
anonymous
Interruption of large currents by relay requires?
Last answer:
Interruption of large currents by relay requires arc suppressing blow out coils, wide separation of the opened contacts, high speed opening of contacts.
interruption
large
currents
relay
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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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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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281
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1
answer
asked
Mar 15, 2018
by
anonymous
What is the difference between eddy current and hysteresis loss?
What is the difference between eddy current and hysteresis loss?
Last answer:
Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses
difference
between
eddy
current
hysteresis
loss
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asked
Aug 6, 2017
by
anonymous
what is eddy current ?
what is eddy current ?
Last answer:
In magnetic circuits when we supply current to coil which wound on some core( of iron cast iron, ferrite ) material it produce magnetic field but there is small amount of flux which also ... heat and losses in magnetic circuits..for good working conditions we always try to minimize eddy current
eddy
current
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asked
Mar 18, 2018
by
anonymous
In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
Last answer:
In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.
alternator
lagging
generated
voltage
phase
compared
unity
power
factor
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207
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1
answer
asked
Mar 10, 2018
by
anonymous
Is electricity generated in AC or DC?
Is electricity generated in AC or DC?
Last answer:
Electricity is generated in AC.
electricity
generated
ac
dc
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99
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1
answer
asked
Jul 21, 2019
by
anonymous
Give two applications of each : 1) Eddy current sensor 2) Optical sensor.
Give two applications of each : 1) Eddy current sensor 2) Optical sensor.
Last answer:
Eddy current sensor : 1. Detection of non-magnetic but conductive materials. 2. Displacement sensing 3. Position sensing Optical sensor : 1. Position Detection 2. Velocity Detection 3. Acceleration Detection 4. Direction Detection
eddy
current
optical
sensor
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49
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1
answer
asked
Apr 30, 2018
by
anonymous
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : (A) 256 W (B) 320 W (C) 500 W (D) 625 W
Last answer:
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W
eddy
current
loss
dc
generator
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77
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1
answer
asked
Apr 26, 2018
by
anonymous
Eddy current damping cannot be used for moving iron instrument because
Eddy current damping cannot be used for moving iron instrument because
Last answer:
Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument
eddy
current
damping
used
moving
iron
instrument
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1
answer
asked
Mar 21, 2018
by
anonymous
The disc of an instrument using eddy current damping should be of?
Last answer:
The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.
disc
instrument
using
eddy
current
damping
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185
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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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531
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1
answer
asked
Aug 1, 2020
by
anonymous
X1 is a 3D form generated from the shape X, using certain 3D operations. It has 14 surfaces in total. The same operations are carried out on shape Y. How many surfaces would the resulting 3D form have?
Last answer:
20
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236
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1
answer
asked
Nov 13, 2018
by
anonymous
How does power is generated in ships
Last answer:
By using diesel generator the power is generated in ships
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128
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1
answer
asked
Oct 16, 2018
by
anonymous
How electricity is generated
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79
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0
answers
asked
Sep 8, 2018
by
anonymous
Write how energy can be stored or generated in each of following : i) solar cell ii) geothermal energy iii) hydrogen energy in biomass.
Write how energy can be stored or generated in each of following : i) solar cell ii) geothermal energy iii) hydrogen energy in biomass.
Last answer:
i) Solar cell : Energy can be stored: 1. Storage Battery is used to store electricity. OR Energy can be generated 1. Directly Conversion: a) By use of P.V Cell ( ... fuels in engines:- 3. The biomass is subjected to fermentation process to obtain a gaseous fuel called biomass
geothermal
energy
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94
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1
answer
asked
May 29, 2018
by
anonymous
The transient currents are due to _____.
The transient currents are due to _____.
Last answer:
The transient currents are due to changes in stored energy in inductors and capacitance
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37
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1
answer
asked
May 14, 2018
by
anonymous
Alternating voltages and currents are represented by straight line with an arrow to represent the
Alternating voltages and currents are represented by straight line with an arrow to represent the magnitude and direction. This representation is called
Last answer:
Alternating voltages and currents are represented by straight line with an arrow to represent the magnitude and direction. This representation is called Phasor quantity
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60
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1
answer
asked
Apr 11, 2018
by
anonymous
Hysteresis and eddy current loss are used in
Hysteresis and eddy current loss are used in (1) Induction heating of steel (2) Dielectric heating (3) Induction heating of brass (4) Resistance heating
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0
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asked
May 25, 2018
by
anonymous
Two heater wires of equal length are connected first in series and then in parallel. The ratio of heat generated
Two heater wires of equal length are connected first in series and then in parallel. The ratio of heat generated from series to parallel connection will be (a) 4 : 1 (b) 2 : 1 (c) 1 : 2 (d) 1 : 4
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0
answers
asked
Apr 5, 2018
by
anonymous
Calculate the power loss, if power generated by two plants are P1=50 MW and P2 =40 MW and the loss...
Calculate the power loss, if power generated by two plants are P1=50 MW and P2 =40 MW and the loss coefficients are B11=0.001, B22=0.0025 and B12=-0.0005. (A) 4.5 MW (B) 5.5 MW (C) 6.5 MW (D) 8.5 MW
Last answer:
A
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1
answer
asked
2 days
ago
by
anonymous
Fishing grounds of the world are found in areas where (1) there are high tides (2) warm and cold currents meet (3) there are low tides (4) high stormy waves occur
Fishing grounds of the world are found in areas where (1) there are high tides (2) warm and cold currents meet (3) there are low tides (4) high stormy waves occur
Last answer:
warm and cold currents meet
world-geography
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2
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1
answer
asked
4 days
ago
by
anonymous
Tsunamis are cuased by (1) mixing of cold and warm currents (2) earthquakes (3) changes in sea level (4) volcanic eruption
Tsunamis are cuased by (1) mixing of cold and warm currents (2) earthquakes (3) changes in sea level (4) volcanic eruption
Last answer:
earthquakes
physical-geography
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2
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1
answer
asked
Jan 7
by
anonymous
Two unpedauces given by Z1 = 10 + j5 and Z2 = 8 + j9 are joined in parallel and connected across a voltage of V = 200 + j0. Calculate the circuit current and branch currents. Draw the vector diagram.
Two unpedauces given by Z1 = 10 + j5 and Z2 = 8 + j9 are joined in parallel and connected across a voltage of V = 200 + j0. Calculate the circuit current and branch currents. Draw the vector diagram.
Last answer:
Solution: Given, Z1=10+j5, Z2=8+j9, V=200+j0
electric
circuits
network
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1
answer
asked
Dec 20, 2020
by
anonymous
Two line currents of an unbalanced 3 phase 3wires system are 100<90 amp and 100<-10 amp find the third line currents
Two line currents of an unbalanced 3 phase 3wires system are 100<90 amp and 100<-10 amp find the third line currents
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21
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0
answers
asked
May 25, 2018
by
anonymous
For heating a magnetic material using induction heating, the hysteresis and eddy current losses are
For heating a magnetic material using induction heating, the hysteresis and eddy current losses are respectively proportional to (a) f and f 2 (b) f 2 and f (c) f and f (d) none of the above
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0
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asked
Mar 21, 2018
by
anonymous
In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be?
Last answer:
In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be out of phase by 90°.
quadrature
potentiometer
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55
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1
answer
asked
4 days
ago
by
anonymous
Troposphere is the hottest part of the atmosphere because (1) it is closest to the Sun (2) there are charged particles in it (3) it is heated by the Earth’s surface (4) heat is generated in it
Troposphere is the hottest part of the atmosphere because (1) it is closest to the Sun (2) there are charged particles in it (3) it is heated by the Earth’s surface (4) heat is generated in it
Last answer:
it is heated by the Earth’s surface
physical-geography
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?
Last answer:
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.
dc
generator
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127
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1
answer
asked
Mar 8, 2020
by
anonymous
Eddy current
Last answer:
Eddy current
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56
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1
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asked
Sep 2, 2018
by
anonymous
Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance
Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance
Last answer:
Ans: i) Length of circuit - a) AC track circuit is having long length upto 3 to 5 km b) DC track circuit is having short length ii)Application -a) AC track circuit is used ... ) Maintenance - a) AC track circuit has easier and cheaper maintenance b) DC track circuit has complicated maintenance
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1
answer
asked
May 25, 2018
by
anonymous
In delta connected load, the zero sequence currents
In delta connected load, the zero sequence currents (a) are absent (b) circulate locally (c) flow through phase wires (d) flow through earth wires
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102
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0
answers
asked
Apr 28, 2018
by
anonymous
A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and
A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are (A) 140 W (B) 180 W (C) 240 W (D) 480 W
Last answer:
A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and frequency are doubled, the new core losses are 240 W
transformer
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1
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asked
Apr 25, 2018
by
anonymous
Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores ...
Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores 3. Ferrites Select the correct answer using the codes given below : (a) 2 and 3 only (b). 1 and 2 only (c) 1 and 3 only (d) 1, 2 and 3
Last answer:
Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores 3. Ferrites Select the correct answer using the codes given below : (a) 2 and 3 only (b). 1 and 2 only (c) 1 and 3 only (d) 1, 2 and 3
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1
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asked
Apr 23, 2018
by
anonymous
In moving iron instruments, eddy current damping cannot be used as
In moving iron instruments, eddy current damping cannot be used as (a) They have a strong operating magnetic, field (b) They are not normally used in vertical position (c) They need a large damping force, which can only be provided by air friction (d) The introduction of a permanent magnet required for eddy current damping would distort the existing weak operating magnetic field
Last answer:
In moving iron instruments, eddy current damping cannot be used as The introduction of a permanent magnet required for eddy current damping would distort the existing weak operating magnetic field
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asked
Apr 10, 2018
by
anonymous
In applying superposition theorem, to determine branch currents and voltages
In applying superposition theorem, to determine branch currents and voltages (a) all current and voltage sources are shorted. (b) only current sources are open circuited. (c) only voltage sources are shorted. (d) voltage sources are shorted and current sources are open circuited.
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92
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0
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asked
Apr 10, 2018
by
anonymous
Which fault gives rise to symmetrical fault currents ?
Which fault gives rise to symmetrical fault currents ? (a) Single line to ground fault (b) Line to line fault (c) Double line to ground fault (d) Three phase fault
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asked
May 13, 2018
by
anonymous
______ signal is generated by combining RD and WR signals with IO/M.
______ signal is generated by combining RD and WR signals with IO/M. (a) Control (b) System (c) Register (d) Memory
Last answer:
Control signal is generated by combining RD and WR signals with IO/M.
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