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Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
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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
reduced
voltage
running
up
test
on
three
phase
induction
motor
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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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answers
asked
Apr 27, 2020
by
anonymous
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
explain
the
procedure
to
perform
short
circuit
test
on
single
phase
transformer
with
diagram
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answers
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
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
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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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
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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answer
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
May 7, 2020
by
anonymous
Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties.
Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties.
Last answer:
Following are requirements of conductor:- i) High conductivity : Material should have high conductivity, So that * cross section of conductor (size) reduces, * Copper losses reduces, * So Efficiency ... . Boiling point is 1820°C 9. Specific gravity is 2.7 10. High resistance to corrosion.
explain
the
suitability
of
aluminium
as
an
electrical
conductor
with
respect
to
its
mechanical
and
properties
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1
answer
asked
May 7, 2020
by
anonymous
Explain the activities carried out during weekly maintenance of 3 ph. Induction motor.
Explain the activities carried out during weekly maintenance of 3 ph. Induction motor.
Last answer:
Activities Carried out During Weekly Maintenance of 3 ph. Induction Motor: 1) Check belt tension. In cases where this is excessive it should immediately be reduces and in the case of sleeve ... and cooled by oil mist systems its important to check the oil mist flow paths/pressure components.
explain
the
activities
carried
out
during
weekly
maintenance
of
3
ph
induction
motor
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78
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1
answer
asked
Apr 21, 2020
by
anonymous
Brake test on DC series motor
Brake test on DC series motor
Last answer:
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
brake
test
on
dc
series
motor
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2
answers
asked
Apr 27, 2020
by
anonymous
Explain the concept of lagging and leading phase angle by waveform.
Explain the concept of lagging and leading phase angle by waveform.
Last answer:
i) Leading phase angle : When two ac quantities of same frequency do not attain their respective zero or peak values simultaneously, then the quantities are said to be out-of-phase quantities. The ... Similarly, in the second diagram, the voltage is said to be lagging the current by Φ.
explain
the
concept
of
lagging
and
leading
phase
angle
by
waveform
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1
answer
asked
Sep 22, 2018
by
anonymous
Explain energy conservation technique in induction motor by minimizing idle and redundant running of motor.
Last answer:
Energy conservation technique in induction motor by minimizing idle and redundant running of motor: 1) Loss of energy as the no load power drawn is approximately about 12% to 16% of rated ... to unnecessary line losses. 4) Reduction in overall system energy efficiency over period of time.
energy
conservation
technique
induction
motor
minimizing
idle
redundant
running
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381
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1
answer
asked
Mar 20, 2018
by
anonymous
The running winding of a single phase motor on testing with meggar is found to be ground...
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?
Last answer:
The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.
running
winding
single
phase
motor
testing
meggar
ground
location
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1
answer
asked
May 3, 2020
by
anonymous
Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.
Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life.
Last answer:
1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series. 2) ... 4) Effect on Life:- If supply voltage is not stable then life of LED get reduced.
analyze
the
effect
of
supply
voltage
on
performance
led
as
regards
current
lumen
output
efficacy
and
life
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1
answer
asked
Mar 20, 2018
by
anonymous
In a capacitor start motor, the phase displacement between starting and running winding can be nearly?
Last answer:
In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.
capacitor
start
motor
phase
displacement
between
starting
running
winding
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131
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1
answer
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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178
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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
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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119
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1
answer
asked
Mar 20, 2018
by
anonymous
In a split phase motor, the running winding should have?
Last answer:
In a split phase motor, the running winding should have low resistance and high inductance.
split
phase
motor
running
winding
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69
views
1
answer
asked
Feb 14, 2018
by
anonymous
Explain the principle of ON OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Last answer:
The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.
on
off
control
phase
ac
voltage
controller
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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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91
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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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131
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2
answers
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
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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198
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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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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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178
views
0
answers
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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128
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6
answers
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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150
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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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106
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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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97
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1
answer
asked
May 3, 2020
by
anonymous
Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin
Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin
Last answer:
i) Special ward in hospital: For the patients in the wards, lighting should create a cozy and pleasant atmosphere. Lighting in the wards should be planned in such a way that it meets the specific ... we use such as cements and bonding agents that we use to restore your teeth back to health.
explain
the
lighting
scheme
to
be
designed
for
each
of
following
i
special
ward
in
hospitals
ii
dentists
cabin
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88
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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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72
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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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129
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1
answer
asked
May 6, 2020
by
anonymous
Explain count up (CTU) instruction with timing diagram.
Explain count up (CTU) instruction with timing diagram.
Last answer:
The CTU is an instruction that counts false-to-true rung transitions. Rung transitions can be caused by events occurring in the program. When rung conditions for a CTU instruction have made a false-to-true ... of Counter up(CTU) Instruction: Too many uploads - please try again in an hour
explain
count
up
ctu
instruction
with
timing
diagram
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68
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1
answer
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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209
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1
answer
asked
May 8, 2018
by
anonymous
A change of 4% in the supply voltage to an induction motor will produce a change of approximately
A change of 4% in the supply voltage to an induction motor will produce a change of approximately
Last answer:
A change of 4% in the supply voltage to an induction motor will produce a change of approximately 8% in the rotor torque
supply
voltage
induction
motor
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197
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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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108
views
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
views
1
answer
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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92
views
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
views
1
answer
asked
Mar 21, 2020
by
anonymous
Source transformation voltage source to current source and vice versa
Last answer:
Source transformation voltage source to current source and vice versa
source
transformation
voltage
to
current
and
vice
versa
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54
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1
answer
asked
May 2, 2020
by
anonymous
With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
Last answer:
Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage.
with
the
help
of
n-channel
jfet
describe
effect
input
voltage
vgs
on
output
current
id
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47
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1
answer
asked
May 7, 2020
by
anonymous
Draw and explain V and inverted V curves for synchronous motor.
Draw and explain V and inverted V curves for synchronous motor.
Last answer:
V curves' and inverted V curves' for Synchronous Motor: V curve: V curve is a plot of the stator current versus field current for different constant loads. The graph is plotted ... Vcurves of synchronous motor. The highest point on each of these curves indicates unity power factor.
draw
and
explain
v
inverted
curves
for
synchronous
motor
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171
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1
answer
asked
May 2, 2020
by
anonymous
Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.
Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.
Last answer:
1. A step down transformer 2. A rectifier 3. A filter 4. A regulator Operation of Regulated Power Supply:- Step Down Transformer:- A step down transformer will ... regulator. A regulator will maintain the output constant even when changes at the input or any other changes occur.
draw
the
block
diagram
of
regulated
power
supply
explain
function
each
and
waveforms
stage
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494
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3
answers
asked
Mar 20, 2018
by
anonymous
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?
Last answer:
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero.
synchronous
motor
synchronised
supply
running
load
negligible
loss
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88
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1
answer
asked
May 6, 2020
by
anonymous
State the impact of inductance and resistance on transmission line performance
State the impact of inductance and resistance on transmission line performance
Last answer:
Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected
state
the
impact
of
inductance
and
resistance
on
transmission
line
performance
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84
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1
answer
asked
May 3, 2020
by
anonymous
Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span
Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span
Last answer:
Parameter LED CFL Lamp Efficiency High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000
compare
the
salient
features
of
led
and
cfl
based
on
i
lamp
efficiency
ii
life
span
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asked
May 7, 2020
by
anonymous
State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
Last answer:
Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows: 1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine
state
the
modification
to
be
done
in
dc
series
motor
work
satisfactorily
as
ac
applications
of
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1
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asked
Apr 22, 2020
by
anonymous
DC motor brake test numerical
DC motor brake test numerical
Last answer:
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dc
motor
brake
test
numerical
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