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The material for commutator brushes is generally?
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Mar 20, 2018
by
anonymous
material
commutator
brushes
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Answer
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answered
Mar 20, 2018
by
anonymous
The material for commutator brushes is generally
carbon.
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Related questions
asked
Mar 20, 2018
by
anonymous
The number of brushes in a commutator depends on?
Last answer:
The number of brushes in a commutator depends on amount of current to be collected.
number
brushes
commutator
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1
answer
asked
Mar 20, 2018
by
anonymous
The insulating material used between the commutator segments is normally?
Last answer:
The insulating material used between the commutator segments is normally mica.
insulating
material
used
between
commutator
segments
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202
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1
answer
asked
Jul 27, 2019
by
anonymous
State the function of commutator in DC generator and name the material used for commutator.
State the function of commutator in DC generator and name the material used for commutator.
Last answer:
Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.
commutator
dc
generator
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134
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1
answer
asked
Mar 20, 2018
by
anonymous
In lap winding, the number of brushes is always?
Last answer:
In lap winding, the number of brushes is always same as the number of poles.
lap
winding
number
brushes
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278
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1
answer
asked
Mar 21, 2018
by
anonymous
Armature coil is short circuited by brushes when it lies?
Last answer:
Armature coil is short circuited by brushes when it lies along neutral axis.
armature
coil
short
circuited
brushes
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1
answer
asked
Mar 21, 2018
by
anonymous
The rapid wear of brushes takes place due to?
Last answer:
The rapid wear of brushes takes place due to abrasion from dust, excessive spring pressure, rough commutator bars, high mica insulation between com-mutation bars.
wear
brushes
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1
answer
asked
Mar 20, 2018
by
anonymous
Brushes of D.C. machines are made of?
Last answer:
Brushes of D.C. machines are made of carbon.
brushes
dc
machines
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63
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1
answer
asked
Mar 20, 2018
by
anonymous
Copper brushes in D.C. machine are used?
Last answer:
Copper brushes in D.C. machine are used where low voltage and high currents are involved.
copper
brushes
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1
answer
asked
Mar 21, 2018
by
anonymous
To avoid formation of grooves in the commutator of a D.C. machine?
Last answer:
To avoid formation of grooves in the commutator of a D.C. machine the brushes of opposite polarity should track each other.
commutator
dc
machine
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1
answer
asked
Mar 20, 2018
by
anonymous
In a commutator?
Last answer:
In a commutator mica is harder than copper.
commutator
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1
answer
asked
Apr 28, 2018
by
anonymous
Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is
Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is (A) 48 (B) 24 (C) 192 (D) 96
Last answer:
Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is 24
commutator
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1
answer
asked
Apr 29, 2018
by
anonymous
In a DC motor, it is important to place the brushes along ______
In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these
Last answer:
In a DC motor, it is important to place the brushes along Magnetic Neutral Axis
dc
motor
brushes
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1
answer
asked
Mar 3, 2018
by
anonymous
Brushes of DC machine are made up of ?
Brushes of DC machine are made up of ?
Last answer:
Brushes of DC machine are made up of carbon.
brushes
dc
machine
made
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1
answer
asked
Apr 29, 2018
by
anonymous
The function of a brush and commutator arrangement in a dc motor is to
The function of a brush and commutator arrangement in a dc motor is to (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking
Last answer:
The function of a brush and commutator arrangement in a dc motor is to produce unidirectional torque
function
brush
commutator
dc
motor
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1
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asked
Apr 29, 2018
by
anonymous
Which of the following does not have a commutator?
Which of the following does not have a commutator? A) Dynamo B) Induction motor C) Universal motor D) None of these
Last answer:
Which of the following does not have a commutator? A) Dynamo B) Induction motor C) Universal motor D) None of these
commutator
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1
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asked
Mar 20, 2018
by
anonymous
Sparking at the commutator of a D.C. motor may result in?
Last answer:
Sparking at the commutator of a D.C. motor may result in damage to commutator segments, damage to commutator insulation, increased power consumption.
sparking
commutator
dc
motor
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1
answer
asked
Mar 20, 2018
by
anonymous
In a A.C. series motor armature coils are usually connected to commutator?
Last answer:
In a A.C. series motor armature coils are usually connected to commutator through resistance.
ac
series
motor
armature
coils
usually
commutator
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1
answer
asked
Sep 18, 2018
by
anonymous
State function of Busbar and which material is used for busbar?
State function of Busbar and which material is used for busbar?
Last answer:
Function of Busbar Bus-bar: - Distribute the load on 3-phase four wire systems. To provide number of connection of incoming line and to provide easy way to connect number of sub circuit. ... to the element. This element means busbar Material is used for busbar: 1. Copper 2. Alluminium
function
busbar
material
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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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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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1
answer
asked
Aug 4, 2019
by
anonymous
Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk
Write one application for the give dielectric material. (i) Polyvinyl Carbide(PVC) (ii) Glass (iii) Mica (iv) Cotton and Silk
Last answer:
(i) Polyvinyl Carbide(PVC):it is used in insulation of wires and cables in domestic wiring as well as in aircraft and factory wiring (any one) (ii) Glass: 1) Alkaline glasses are used for ... with wax or varnishes are used in windings of magnet coils and small medium sized mechanics (any one)
dielectric
material
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59
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1
answer
asked
Sep 6, 2018
by
anonymous
Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.
Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.
Last answer:
(i) Material used for Moving coil: Copper, Aluminum( some times) (ii) Permanent magnets are made of special alloys such as : Aluminum-Nickel-Cobalt (Alnicos) Strontium-Iron Neodymium-Iron-Boron Samarium-Cobalt.
material
used
moving
coil
permanent
magnet
pmmc
instrument
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1
answer
asked
Sep 5, 2018
by
anonymous
State the material used for moving coil and former for PMMC instruments.
State the material used for moving coil and former for PMMC instruments.
Last answer:
Material Used for Moving Coil and Former for PMMC Instruments: Material used for moving coil: Copper Material used for Former: Aluminium
material
used
moving
coil
pmmc
instruments
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117
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1
answer
asked
Aug 12, 2018
by
anonymous
State the four major parts of Transformer and material used for their construction.
State the four major parts of Transformer and material used for their construction.
transformer
major
parts
material
construction
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82
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0
answers
asked
Mar 20, 2018
by
anonymous
The material used for fuse must have?
Last answer:
The material used for fuse must have low melting point and high specific resistance.
material
used
fuse
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131
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1
answer
asked
May 5, 2020
by
anonymous
State properties of conductor material used for overhead conductor.
State properties of conductor material used for overhead conductor.
Last answer:
Following are the properties of conductor material:- 1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value.
state
properties
of
conductor
material
used
for
overhead
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73
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1
answer
asked
Mar 25, 2018
by
anonymous
A material for good magnetic memory should have?
A material for good magnetic memory should have?
Last answer:
A material for good magnetic memory should have high retentivity.
material
good
magnetic
memory
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102
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1
answer
asked
Mar 20, 2018
by
anonymous
In D.C. generators, the brushes on commutator remain in contact with conductors which?
Last answer:
In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.
dc
generators
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168
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1
answer
asked
Jun 18, 2018
by
anonymous
The magnetic susceptibility of paramagnetic material is:
The magnetic susceptibility of paramagnetic material is: A) Less than zero B) Less than one but positive C) Greater than one D) Equal to zero
Last answer:
The magnetic susceptibility of paramagnetic material is: Less than one but positive
magnetic
susceptibility
paramagnetic
material
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152
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1
answer
asked
Apr 30, 2018
by
anonymous
The material used in liquid fuses is
The material used in liquid fuses is (1) SF6 (3) carbon tetra chloride (2) distilled water (4) transformer oil
Last answer:
The material used in liquid fuses is carbon tetra chloride
material
used
liquid
fuses
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256
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1
answer
asked
Mar 25, 2018
by
anonymous
The property of a material which opposes the creation of magnetic flux in it is known as?
The property of a material which opposes the creation of magnetic flux in it is known as?
Last answer:
The property of a material which opposes the creation of magnetic flux in it is known as reluctance.
property
material
opposes
creation
magnetic
flux
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275
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1
answer
asked
Mar 25, 2018
by
anonymous
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be?
Last answer:
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be large.
area
hysteresis
loop
material
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217
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1
answer
asked
Mar 25, 2018
by
anonymous
The relative permeability of a ferromagnetic material is?
The relative permeability of a ferromagnetic material is?
Last answer:
The relative permeability of a ferromagnetic material is more than 100 or 1000.
relative
permeability
ferromagnetic
material
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75
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1
answer
asked
May 7, 2020
by
anonymous
State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material.
State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material.
Last answer:
(i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C
state
two
applications
of
i
pvc
paper
ii
porcelain
with
type
class
based
on
withstand
temperature
is
insulating
material
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1
answer
asked
Sep 8, 2018
by
anonymous
What is piezoelectric effect? Name two piezoelectric material.
What is piezoelectric effect? Name two piezoelectric material.
Last answer:
piezoelectric effect: Piezoelectric effect can be stated as follows: when a pressure or force or vibration is applied to crystalline material like quartz crystal or crystalline substances, then ... crystal: Quartz crystal ,Rochelle salt 2) Synthetic crystals : Barium Titanate, Lithium sulphate
piezoelectric
effect
material
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52
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1
answer
asked
Sep 4, 2018
by
anonymous
What is amorphous metal material? Give any three properties of amorphous metal.
What is amorphous metal material? Give any three properties of amorphous metal.
Last answer:
Amorphous metal: The amorphous is metal alloy which differ in crystalline structure. The atoms are arranged in random configuration. Properties of amorphous metal: 1) Thermal conductivity of ... . 6) The alloy does not undergo shrinkage on solidification, which helps in bones attachments.
amorphous
metal
material
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50
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1
answer
asked
Sep 4, 2018
by
anonymous
What is dielectric strength of an insulating material? What is its unit?
What is dielectric strength of an insulating material? What is its unit?
Last answer:
Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm
dielectric
strength
insulating
material
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45
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1
answer
asked
Mar 11, 2018
by
anonymous
What is antiferromagnetic material?
What is antiferromagnetic material?
antiferromagnetic
material
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45
views
0
answers
asked
May 16, 2020
by
anonymous
Suggest the diode material suitable to rectify 0.5V AC signal.
Suggest the diode material suitable to rectify 0.5V AC signal.
Last answer:
The diode material suitable to rectify 0.5V AC signal is silicon
diode
material
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88
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1
answer
asked
Aug 5, 2019
by
anonymous
(i) Explain the process of diffusion in semiconductor material. (ii) Explain Hall effect.
(i) Explain the process of diffusion in semiconductor material. (ii) Explain Hall effect.
Last answer:
(i) Diffusion: In a semi conductor bar a concentration gradient exist when either number of electrons or holes is greater in one region of a semi conductor as compared to other region. When ... to determine whether a semiconductor is N type or P type, and to find carrier concentration
diffusion
semiconductor
material
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46
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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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132
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1
answer
asked
May 7, 2020
by
anonymous
State gaseous and liquid insulating material.
State gaseous and liquid insulating material.
Last answer:
i) Gaseous insulating material : 1. Air 2. Nitrogen 3. Hydrogen 4. SF6 ii) liquid insulating material: 1. Transformer oil 2. Capacitor oil 3. Cable oil 4. Pyranol 5. Savotal 6. Savol 7. Vegetable oil 8. Silicon liquids
state
gaseous
and
liquid
insulating
material
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51
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1
answer
asked
Sep 4, 2018
by
anonymous
Based on temperature withstanding ability, classify insulating material.
Based on temperature withstanding ability, classify insulating material.
Last answer:
class Temperature withstanding ability in 0C Materials Y 90 Cotton, silk paper and similar organic materials neither impregnated nor immersed in any oil, rubber, PVC. A 105 ... rubber compounds C Above 180 Mica, ceramics, glass, Teflon, quartz, etc.
temperature
ability
classify
insulating
material
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53
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1
answer
asked
Sep 4, 2018
by
anonymous
List four examples of insulating material and explain any two.
List four examples of insulating material and explain any two.
Last answer:
Examples of insulating materials: i) Solid: Ceramic, Porcelain, Mica, Glass, Rubber, Resinous, Fibers ii) Liquid: Synthetic, Mineral etc. iii) Gaseous: Hydrogen, Air, ... and low hygroscopicity. Uses: Insulation in electric field, transformer stampings, armature, pole stampings
examples
insulating
material
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38
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1
answer
asked
Sep 4, 2018
by
anonymous
What are insulating material?
What are insulating material?
Last answer:
Insulating material: Insulating material is that which offers very high resistance to the flow of current through it.
insulating
material
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42
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1
answer
asked
Mar 25, 2018
by
anonymous
Resistance of a material always decreases if?
Resistance of a material always decreases if?
Last answer:
Resistance of a material always decreases if number of free electrons available become more.
resistance
material
decreases
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105
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1
answer
asked
Mar 25, 2018
by
anonymous
In a magnetic material hysteresis loss takes place primarily due to?
In a magnetic material hysteresis loss takes place primarily due to?
Last answer:
In a magnetic material hysteresis loss takes place primarily due to it high retentivity.
magnetic
material
hysteresis
loss
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169
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1
answer
asked
Mar 3, 2018
by
anonymous
From which material field coils of DC generator are made of?
From which material field coils of DC generator are made of?
Last answer:
Field coils of DC generator are usually made of copper.
material
field
coils
dc
generator
made
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97
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1
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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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536
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1
answer
asked
Sep 18, 2017
by
anonymous
What are commutator brushes made of?
Last answer:
Commutator brushes are made up of carbon.
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