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What is a three phase connection?
asked
Dec 22, 2017
by
anonymous
What is a three phase connection?
three
phase
connection
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1
Answer
answered
Dec 29, 2017
by
chandan
RYB, 440 volt/phase
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Related questions
asked
May 7, 2020
by
anonymous
Explain MCB and ELCB with connection diagram supplying single phase load.
Explain MCB and ELCB with connection diagram supplying single phase load.
Last answer:
OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel.
explain
mcb
and
elcb
with
connection
diagram
supplying
single
phase
load
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201
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1
answer
asked
Aug 11, 2018
by
anonymous
Write the relation between phase and line current, phase and line voltage for Star connection.
Write the relation between phase and line current, phase and line voltage for Star connection.
Last answer:
Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection
phase
line
current
voltage
star
connection
relation
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131
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2
answers
asked
Mar 3, 2018
by
anonymous
What is mean by plugging in three phase induction motor?
What is mean by plugging in three phase induction motor?
Last answer:
Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.
plugging
three
phase
induction
motor
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127
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1
answer
asked
Dec 22, 2017
by
anonymous
What is difference between Star and Delta Connection?
What is difference between Star and Delta Connection?
Last answer:
Star is 1. Open ckt 2. At center point present neutral Delta is 1. Closed ckt 2. Neutral not present in this case
difference
between
star
delta
connection
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127
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1
answer
asked
Sep 2, 2019
by
anonymous
Why is a capacitor used in a single phase motor and not in three phase motor ?
Why is a capacitor used in a single phase motor and not in three phase motor ?
Last answer:
In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.
capacitor
single
three
phase
motor
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6
answers
asked
Aug 18, 2019
by
anonymous
Why is a three phase denoted by R, Y, B ?
Why is a three phase denoted by R, Y, B ?
Last answer:
phase 1 ,R =Red colour cable terminal, phase 2 Y=Yellow colour terminal cable,Phase 3 B=Blue colour cable terminal, N =Neutral. For identification.
three
phase
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171
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2
answers
asked
Apr 28, 2018
by
anonymous
When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is
When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%
Last answer:
When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%
three
phase
system
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71
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1
answer
asked
Mar 25, 2018
by
anonymous
In a three-phase supply floating neutral is undesirable because it way give rise to?
In a three-phase supply floating neutral is undesirable because it way give rise to?
Last answer:
In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.
three
phase
supply
floating
neutral
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88
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1
answer
asked
Mar 17, 2018
by
anonymous
How is a three phase cage induction motor self starting?
How is a three phase cage induction motor self starting?
Last answer:
Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting
three
phase
cage
induction
motor
self
starting
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95
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1
answer
asked
Apr 29, 2018
by
anonymous
The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is
The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is
Last answer:
The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is 4 percent
slip
three
phase
4
-pole
induction
motor
rotating
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169
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1
answer
asked
May 7, 2020
by
anonymous
List different starting methods of three phase synchronous motor. Explain any one of them.
List different starting methods of three phase synchronous motor. Explain any one of them.
Last answer:
Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.
list
different
starting
methods
of
three
phase
synchronous
motor
explain
any
one
them
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66
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1
answer
asked
Apr 16, 2020
by
anonymous
Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor
Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.
no
load
and
blocked
rotor
tests
on
three
phase
induction
motor
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85
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0
answers
asked
Apr 16, 2020
by
anonymous
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
explain
the
need
and
steps
to
conduct
reduced
voltage
running
up
test
on
three
phase
induction
motor
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58
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0
answers
asked
Jul 30, 2019
by
anonymous
State any four advantages of three phase induction motor.
State any four advantages of three phase induction motor.
Last answer:
Advantages of three phase induction motor https://youtu.be/27OIOCKN05U
three
phase
induction
motor
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100
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2
answers
asked
Sep 6, 2018
by
anonymous
Define balanced and unbalanced load in three phase circuit.
Define balanced and unbalanced load in three phase circuit.
Last answer:
Balanced Load: When all the imedances of 3 phases are equal in magnitude and of same nature then load is said to be balanced. Unbalanced Load: When all the imedances of 3 phases are not equal in magnitude and of different nature then load is said to be unbalanced.
balanced
unbalanced
load
three
phase
circuit
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1
answer
asked
Aug 12, 2018
by
anonymous
State any four application of three phase circuit.
State any four applications of three phase circuits.
Last answer:
The application of three phase circuits are 1. Three phase circuit is used for power transmission over long distances. 2. Three phase circuit can produce rotating magnetic field 3. Three phase ... three phase Motors and Transformers. 4. Three phase circuit is used for power converters circuits.
applications
three
phase
circuit
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164
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1
answer
asked
Aug 11, 2018
by
anonymous
Draw the waveform of three phase AC supply voltage.
Draw the waveform of three phase AC supply voltage.
waveform
three
phase
ac
supply
voltage
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161
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0
answers
asked
Aug 11, 2018
by
anonymous
State advantages of three phase over single phase.
State advantages of three phase over single phase.
Last answer:
Advantages of 3-phase system over 1-phase system: - 1. More output: For the same size, output of poly-phase machines is always higher than single phase machines. 2. Smaller size: For ... are self- starting: The three phase ac motors are self starting, while single phase induction motor are not.
advantages
three
phase
single
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2.8k
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4
answers
asked
Mar 18, 2018
by
anonymous
Three phase synchronous motor will have how many sliprings?
Three phase synchronous motor will have how many sliprings?
Last answer:
Three phase synchronous motor will have two sliprings.
three
phase
synchronous
motor
slipring
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71
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1
answer
asked
Mar 11, 2018
by
anonymous
Explain power relations in three phase circuit.
Explain power relations in three phase circuit.
power
relations
three
phase
circuit
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70
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0
answers
asked
Mar 8, 2018
by
anonymous
Explain three phase half wave controller or three phase unidirectional controller.
Explain three phase half wave controller or three phase unidirectional controller.
Last answer:
Three phase half wave controller or unidirectional controller:
explain
three
phase
half
wave
controller
unidirectional
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175
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1
answer
asked
Mar 7, 2018
by
anonymous
Explain Three Phase Bidirectional Delta Connected Controller.
Explain Three Phase Bidirectional Delta Connected Controller.
Last answer:
Three Phase Bidirectional Delta Connected Controller:
three
phase
bidirectional
delta
connected
controller
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397
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1
answer
asked
Feb 19, 2018
by
anonymous
Explain three phase bridge inverter.
Explain three phase bridge inverter.
Last answer:
Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.
three
phase
bridge
inverter
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348
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1
answer
asked
Feb 14, 2018
by
anonymous
Explain three phase full wave controller.
Explain three phase full wave controller.
Last answer:
Three phase full wave controller: Three phase full wave controller is also called as the three-phase bidirectional controller. Let the load is star connected so at each phase there are antiparallel connected SCRs. ... conduct at the same time and the third phase will be open.
explain
three
phase
full
wave
controller
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231
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1
answer
asked
Nov 16, 2017
by
anonymous
three phase to single phase cycloconverter
three phase to single phase cycloconverter
Last answer:
three phase to single phase cycloconverter
three
single
phase
cycloconverter
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398
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1
answer
asked
Oct 4, 2017
by
anonymous
how can we reverse the direction of rotation of three phase induction motor?
how can we reverse the direction of rotation of three phase induction motor ?
Last answer:
The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.
three
phase
induction
motor
rotation
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100
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1
answer
asked
May 22, 2020
by
anonymous
Explain with the neat circuit diagram only the scott connection scheme for conversion of three phase supply to two phase supply. Name one application of the same.
Explain with the neat circuit diagram only the scott connection scheme for conversion of three phase supply to two phase supply. Name one application of the same.
Last answer:
Three-phase to Two-phase Transformation (Scott Connection of Transformers): Working: i) Scott connection can be used for three-phase to two-phase conversion using two single-phase transformers ... a 3-phase system with a two-phase system with the flow of power in either direction.
scott
connection
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96
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1
answer
asked
Aug 11, 2018
by
anonymous
Write short notes on 3 phase AC system.
Write short notes on 3 phase AC system.
three
phase
ac
system
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106
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0
answers
asked
May 8, 2018
by
anonymous
Which of the following 3-phase connection of a transformer causes interference with the
Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: (A) Delta-Star (B) Star-Delta (C) Delta-Delta (D) Star-Star
Last answer:
Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines: Star-Star
3-phase
connection
transformer
interference
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117
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1
answer
asked
Dec 22, 2017
by
anonymous
What is the voltage in 3 phase line?
What is the voltage in 3 phase line?
Last answer:
between 430 to 440 v
voltage
phase
line
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256
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4
answers
asked
Sep 7, 2018
by
anonymous
State the principle of solar cell. What is necessity of series and parallel connection of solar cells.
State the principle of solar cell. What is necessity of series and parallel connection of solar cells.
Last answer:
Principle of solar cell:- Working:- Solar cell operates on principle of Photo-voltaic effect Solar cell works in following steps: The solar cell is composed of a P-type ... of Voltage & Current rating it is necessity of connecting series and parallel connection of solar cells.
solar
cell
series
parallel
connection
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66
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1
answer
asked
Aug 29, 2018
by
normzhie
What is the connection of winding of capacitor start motor
number of windings of a coil in a stator of ac motor for ey slot ac motor
connection
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125
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0
answers
asked
Sep 20, 2018
by
anonymous
State functions of ; i) Cable box ii) Guard wire iii) Shackle insulator iv) Stay wire used in service connection
State functions of ; i) Cable box ii) Guard wire iii) Shackle insulator iv) Stay wire used in service connection
Last answer:
i) Function of Cable box: To hold and inspect incoming and outgoing terminals ii) Function of Guard wire : A grounded conductor placed beneath an overhead transmission line in order to ground ... in service connection: To give mechanical Support to pole, line and prevent leakage current if any
cable
box
guard
wire
shackle
insulator
stay
used
service
connection
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87
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1
answer
asked
Sep 18, 2018
by
anonymous
Why underground service connections are service connections are costly than overhead service connection
Why underground service connections are service connections are costly than overhead service connection
Last answer:
Reason: Underground service connection is given by underground cable. This cable is costly than bare conductor. Sometimes cable trench is required for cable laying, which requires additional cost. So underground service connections are costly than overhead service connection.
underground
service
connections
costly
overhead
connection
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89
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1
answer
asked
Sep 18, 2018
by
anonymous
Define service connection and state types connection and state types of overhead service connection
Define service connection and state types connection and state types of overhead service connection
Last answer:
Service Connection:- It is the input conductor or wire which is carried out from supply company (authorities) pole to consumers' main board or premises. Types of overhead service ... 1. Overhead service connection with Bare conductor 2. Overhead service connection with weather proof cable
define
service
connection
state
types
overhead
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136
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1
answer
asked
Sep 4, 2018
by
anonymous
State necessity of series connection and parallel connection of batteries.
State necessity of series connection and parallel connection of batteries.
Last answer:
Necessity of series connection of batteries: 1. The batteries are available with some specific terminal voltages. e. g. 6V, 12V, 24V, 48V etc. 2. If we want to have some terminal voltage other than ... batteries of capacities I1, I2, I3, I4 . are connected in parallel, all having identical emfs.
state
necessity
series
connection
parallel
batteries
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58
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1
answer
asked
Aug 12, 2018
by
anonymous
Compare star and Delta Connection.
Compare star and Delta Connection.
Last answer:
Compare Star and Delta connected system: Star connected system Delta connected system In STAR connection, the starting or finishing ends (Similar ends) of three coils are connected together to form the ... VPH Line Current is √3 times of Phase Current. i.e. IL = √3 IPH
compare
star
delta
connection
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3.0k
views
5
answers
asked
May 8, 2018
by
anonymous
Which of the following connection of transformers will give highest value of secondary voltage ?
Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary
Last answer:
Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary
connection
transformers
highest
value
secondary
voltage
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109
views
1
answer
asked
Mar 20, 2018
by
anonymous
Direction of rotation of a split phase motor can be reversed by reversing the connection of?
Last answer:
Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.
direction
rotation
split
phase
motor
reversed
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143
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1
answer
asked
Apr 29, 2018
by
anonymous
Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch
Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these
Last answer:
Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these
circuit
three
parallel
branches
connected
dc
supply
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169
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1
answer
asked
Nov 30, 2017
by
anonymous
what is the difference between four point starter and three point starter?
what is the difference between four point starter and three point starter?
Last answer:
The only difference is in the NO VOLT COIL connection in the starter, in three point starter NVC is connected to the field whereas in four point starter it is connected separately. The advantage of using ... (for above rated speed) and lead to DEENERGISE the NVC leading to turning off of the motor.
four
point
starter
three
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87
views
1
answer
asked
Mar 14, 2018
by
anonymous
What are three ways you can increase the strength of an electromagnet?
What are three ways you can increase the strength of an electromagnet?
three
ways
increase
strength
electromagnet
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59
views
0
answers
asked
Aug 12, 2018
by
anonymous
For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed
For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed
phase
voltage
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147
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0
answers
asked
Mar 20, 2018
by
anonymous
In case one phase of a three-phase synchronous motor is short-circuited the motor will?
Last answer:
In case one phase of a three-phase synchronous motor is short-circuited the motor will not start.
one
phase
three-phase
synchronous
motor
short-circuited
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175
views
1
answer
asked
Mar 20, 2018
by
anonymous
A three point starter is considered suitable for?
Last answer:
A three point starter is considered suitable for shunt as well as compound motors.
three
point
starter
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76
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1
answer
asked
May 3, 2020
by
anonymous
Describe control of a single lamp from three places. Draw the relevant circuit diagram.
Describe control of a single lamp from three places. Draw the relevant circuit diagram.
Last answer:
Single lamp control from three places- It consists of two way switches & intermediate switch, the circuit diagram is as shown in figure. We require two 2-way switches and one intermediate switch and a lamp ... position of any one switch is changed, then the lamp will be turned off.
describe
control
of
a
single
lamp
from
three
places
draw
the
relevant
circuit
diagram
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89
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1
answer
asked
Aug 11, 2018
by
anonymous
Define phase sequence of three phase supply with waveforms.
Define phase sequence of three phase supply with waveforms. What is normal phase sequence? Which 3 standard colours are used to denote the phase sequence?
Last answer:
It is sunnosoidal sequence.
phase
sequence
3-phase
supply
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100
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1
answer
asked
Aug 9, 2017
by
anonymous
speed control methods of three phase induction motor?
speed control methods of three phase induction motor?
Last answer:
Speed control of three phase induction motor
speed
control
phase
induction
motor
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195
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2
answers
asked
Jun 29, 2019
by
anonymous
List three important characteristics of an electric circuit.
List three important characteristics of an electric circuit.
list
three
important
characteristics
of
an
electric
circuit
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206
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0
answers
asked
Apr 29, 2018
by
anonymous
When three resistors with unequal values are connected in parallel, _______
When three resistors with unequal values are connected in parallel, _______ A) The current across the resistors is the same B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these
Last answer:
When three resistors with unequal values are connected in parallel, The voltage drop across the resistors is the same
three
resistors
unequal
values
connected
parallel
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70
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1
answer
...