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how can we reverse the direction of rotation of three phase induction motor?
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asked
Oct 4, 2017
by
anonymous
how can we reverse the direction of rotation of three phase induction motor ?
three
phase
induction
motor
rotation
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1
Answer
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answered
Oct 4, 2017
by
Ultrawolf
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.
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Related questions
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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1
answer
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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2
answers
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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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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86
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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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0
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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1
answer
asked
Mar 18, 2018
by
anonymous
How can we reverse the direction of rotation of synchronous motor?
How can we reverse the direction of rotation of synchronous motor?
Last answer:
By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.
reverse
direction
rotation
synchronous
motor
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197
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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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147
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1
answer
asked
Mar 20, 2018
by
anonymous
To reverse the direction of rotation of a capacitor start motor while it is running we should?
Last answer:
To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.
rotation
capacitor
start
motor
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81
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1
answer
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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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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2
answers
asked
Mar 17, 2018
by
anonymous
How does a single phase induction motor work?
How does a single phase induction motor work?
Last answer:
As we know that single phase induction is not self started because for self started we require atleast two revolving field but single phase induction motor has only one. So we provide extra ... 1phase IM classified as split phase IM, capacitor start capacitor run, capacitor start induction run.
single
phase
induction
motor
work
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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
Apr 28, 2018
by
anonymous
The direction of rotation of an inverter fed 3-phase ac motor is reversed by
The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching
Last answer:
The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching
direction
rotation
inverter
fed
3-phase
ac
motor
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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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1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of a D.C. series motor can be changed by?
Last answer:
The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
direction
rotation
dc
series
motor
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75
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1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of universal motor can be reversed the by reversing the flow of current through?
Last answer:
The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.
direction
rotation
universal
motor
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104
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1
answer
asked
Jul 30, 2019
by
anonymous
Explain the working of a single phase capacitor start induction motor.
Explain the working of a single phase capacitor start induction motor.
Last answer:
Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc
single
phase
capacitor
start
induction
motor
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2
answers
asked
Apr 29, 2018
by
anonymous
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these
Last answer:
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these
single
phase
induction
motor
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79
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1
answer
asked
Mar 20, 2018
by
anonymous
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?
Last answer:
Reason is kinetic energy
single
phase
induction
motor
disconnected
supply
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133
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2
answers
asked
Oct 24, 2017
by
anonymous
explain the working of single phase induction motor.
explain the working of single phase induction motor.
Last answer:
Stator has two winding namely main winding and auxiliary winding.when single phase ac supply is given to the motor,its produces alternating field.this field cut by a cage rotor.so some emf ... due to this emf,rotor flux produced.the interaction between two fluxes produce torque.so rotor rotates.
motor
induction
phase
working
single
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1
answer
asked
Mar 20, 2018
by
anonymous
If a single phase induction motor runs slower than normal, the most likely defect is?
Last answer:
If a single phase induction motor runs slower than normal, the most likely defect is worn bearings.
single
phase
induction
motor
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111
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1
answer
asked
Sep 20, 2018
by
anonymous
Split phase induction motor
Split phase induction motor
Last answer:
Split phase induction motor : There are two windings used in split phase induction motor. It is a type of single-phase induction motor. There are two winding one is called main winding and ... motor have low starting torque it is used for small fans, blowers, centrifugal pumps, grinders etc.
split
phase
induction
motor
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179
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1
answer
asked
Mar 20, 2018
by
anonymous
Single phase induction motor usually operates on?
Last answer:
Single phase induction motor usually operates on 0.6 power factor lagging.
single
phase
induction
motor
operates
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99
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1
answer
asked
Mar 20, 2018
by
anonymous
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by...
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?
Last answer:
A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.
capacitor-start
single
phase
induction
motor
switched
supply
capacitor
inductor
equivalent
reactance
value
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100
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1
answer
asked
Aug 9, 2017
by
anonymous
Single Phase Induction Motor
Single Phase Induction Motor
Last answer:
Single Phase Induction Motor Single phase induction motor is mostly used in home, office, shop and many single phase appliances like pumps, ... torque and silent operation. It is uses where silent operation is required.
single
phase
induction
motor
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453
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1
answer
asked
Mar 20, 2018
by
anonymous
In case of a shaded pole motor the direction of rotation of the motor is?
Last answer:
In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
shaded
pole
motor
direction
rotation
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113
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1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of an hysteresis motor is determined by?
Last answer:
The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.
direction
rotation
hysteresis
motor
determined
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1
answer
asked
Mar 20, 2018
by
anonymous
In repulsion motor direction of rotation of motor?
Last answer:
In repulsion motor direction of rotation of motor is the same as that of brush shift.
repulsion
motor
direction
rotation
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85
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1
answer
asked
Apr 29, 2018
by
anonymous
In a single-phase induction motor, the operating direction is determined by the ________
In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these
Last answer:
In a single-phase induction motor, the operating direction is determined by the Starting circuit
single-phase
induction
motor
operating
direction
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79
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1
answer
asked
May 1, 2018
by
anonymous
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last answer:
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
speed
three-phase
induction
motor
controlled
variable
voltage
frequency
control
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1
answer
asked
Apr 28, 2018
by
anonymous
An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW.
An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is (A) 5.06 kW (B) 0.3 kW (C) 100 kW (D) 83.33 kW
Last answer:
An 8-pole, 50Hz, three-phase induction motor is running at 705rpm and has a rotor copper loss of 5kW. Its rotor input is 83.33 kW
induction
motor
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1
answer
asked
Apr 29, 2018
by
anonymous
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be
Last answer:
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be 25 N -m
torque
three-phase
induction
motor
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92
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1
answer
asked
Apr 29, 2018
by
anonymous
A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for
A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for
Last answer:
A 400 V, 50 Hz three-phase induction motor rotates at 1440 rpm on full -load. The motor is wound for 4 poles
three-phase
induction
motor
rotates
wound
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1
answer
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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72
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1
answer
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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172
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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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59
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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
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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0
answers
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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166
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1
answer
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
Apr 10, 2018
by
anonymous
Direction of rotation of three phase induction motor can be reversed by
Direction of rotation of three phase induction motor can be reversed by (a) interchanging connections of any two phases (b) disconnecting any one phase (c) (a) and (b) both (d) None of the above
Last answer:
The direction of rotation of 3-phase induction motor is reversed by Changing the phase sequence of supply. OR The direction of rotation of 3-phase induction motor is reversed by inter-changing any two phase connections of motor terminals with supply terminals.
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2
answers
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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179
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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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400
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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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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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answer
asked
Dec 22, 2017
by
anonymous
What is a three phase connection?
What is a three phase connection?
Last answer:
RYB, 440 volt/phase
three
phase
connection
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1
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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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404
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1
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asked
Apr 28, 2018
by
anonymous
In a split-phase induction motor, the resistance/reactance ratios of windings are such that
In a split-phase induction motor, the resistance/reactance ratios of windings are such that (A) current in the auxiliary winding leads the current in the main winding (B) current in the auxiliary winding lags the current in the main winding (C) both windings develop the same starting torque (D) both windings develop high starting current
Last answer:
In a split-phase induction motor, the resistance/reactance ratios of windings are such that current in the auxiliary winding leads the current in the main winding
split-phase
induction
motor
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