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Explain Three Phase Bidirectional Delta Connected Controller.
asked
Mar 7, 2018
by
anonymous
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Apr 21, 2018
by
anonymous
Explain Three Phase Bidirectional Delta Connected Controller.
three
phase
bidirectional
delta
connected
controller
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Answer
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Mar 7, 2018
by
anonymous
Three Phase Bidirectional Delta Connected Controller:
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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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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
Aug 12, 2018
by
anonymous
A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.
A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.
balanced
three-phase
delta
connected
load
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answers
asked
Aug 11, 2018
by
anonymous
Draw the Delta connected three phase system showing all the voltages and currents.
Draw the Delta connected three phase system showing all the voltages and currents. Write the power equation.
delta
connected
voltage
current
power
equation
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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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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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346
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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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1
answer
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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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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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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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 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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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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answers
asked
May 8, 2018
by
anonymous
In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -
In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -
Last answer:
In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be 3
r-c
phase
shift
oscillator
minimum
networks
connected
cascade
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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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2
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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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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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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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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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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4
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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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166
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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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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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87
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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
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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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
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
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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1
answer
asked
Aug 11, 2018
by
anonymous
What is line voltage and phase voltage?
What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.
line
voltage
phase
star
connected
system
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106
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0
answers
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
Oct 13, 2019
by
anonymous
Temperature controller using SCR
Temperature controller using SCR
Last answer:
Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.
temperature
controller
scr
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1
answer
asked
Jul 21, 2019
by
anonymous
Draw and explain pneumatic proportional controller.
Draw and explain pneumatic proportional controller.
Last answer:
Explanation : Basic : Proportional control is one in which the process input is change in direct proportion to the error(t) controls the output so that the manipulated variable and the error has proportional relation. ... the MV and SP reference value called as error Given as : Error = SP - MV
pneumatic
proportional
controller
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1
answer
asked
Jan 24, 2018
by
anonymous
Explain Keypad controller.
Explain Keypad controller.
Last answer:
Keypad Controller: It's a device which interfaces between the computer and keyboard. That is a input device and used for transfer the data to connected device.
keypad
controller
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277
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2
answers
asked
Apr 27, 2020
by
anonymous
Explain the open delta (delta-delta) test on transformer.
Explain the open delta (delta-delta) test on transformer.
open
delta
delta-delta
test
transformer
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55
views
0
answers
asked
May 8, 2018
by
anonymous
Three identical resistors connected in star consume 5000 W. If the resistors are connected in
Three identical resistors connected in star consume 5000 W. If the resistors are connected in delta across the same supply, the power consumed will be
Last answer:
Three identical resistors connected in star consume 5000 W. If the resistors are connected in delta across the same supply, the power consumed will be 15000 W
identical
resistors
connected
star
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88
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1
answer
asked
Mar 25, 2018
by
anonymous
With three resistances connected in parallel, if each dissipates 20 W the ...
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals?
Last answer:
Power is the only thing which is additive in both connection whether it is parallel or series connection so total power consumed will addition of all individual power =20+20+20 = 60 watt
resistances
connected
parallel
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2
answers
asked
Apr 30, 2018
by
anonymous
A four -quadrant operation requires two full converters connected in
A four -quadrant operation requires two full converters connected in (1) Series (3) Back to back (2) Parallel (4) Series Cascade
Last answer:
A four-quadrant operation requires two full converters connected in Parallel
four
quadrant
operation
full
converters
connected
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445
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1
answer
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
Apr 28, 2018
by
anonymous
The sequence components of current of a single-phase load connected to a 3-phase system are
The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero
Last answer:
The sequence components of current of a single-phase load connected to a 3-phase system are equal positive, negative and zero sequence components
sequence
components
current
single-phase
load
connected
3-phase
system
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393
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1
answer
asked
Sep 1, 2019
by
anonymous
What is the purpose of auxiliary controller in substation?
What is the purpose of auxiliary controller in substation?
Last answer:
The systems of substation auxiliaries ensure operation of substations providing internal consumers of substations with operating direct and alternating currents. Any breakdown (loss) of auxiliary systems ... whole substation, as well as serious problems during its subsequent putting into operation.
auxiliary
controller
substation
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60
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1
answer
asked
Aug 16, 2019
by
anonymous
Define Integral controller. State their advantages
Define Integral controller. State their advantages
Last answer:
Advantages of integral control action: 1) Improves steady state response 2) Removes offset error in the process variable. 3) Eliminates steady state error
integral
controller
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1
answer
asked
Aug 9, 2019
by
anonymous
When to select P-I controller? Give any two application of P-I controller.
When to select P-I controller? Give any two application of P-I controller.
Last answer:
Selection of P-I controller: The PI mode of controller is commonly selected for slow-to- moderate speed processes. Fast response of the system is not required. Large disturbances and ... an issue. As a adaptive controller for flow process. Real time pressure control process.
p-i
controller
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1
answer
asked
Apr 28, 2018
by
anonymous
A Unified Power Flow Controller (FACTS controller) is a voltage source converter based
A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator
Last answer:
A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators
unified
power
flow
controller
facts
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81
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1
answer
asked
Mar 10, 2018
by
anonymous
What is an electronic controller?
What is an electronic controller?
electronic
controller
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51
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0
answers
asked
Apr 12, 2020
by
anonymous
Delta to Star Conversion Example
Delta to Star Conversion Example
Last answer:
Delta to Star Conversion Example
delta
to
star
conversion
example
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2
answers
asked
Apr 12, 2020
by
anonymous
Wye (Star) to Delta Conversion
Wye (Star) to Delta Conversion
Last answer:
Wye (Star) to Delta Conversion
wye
star
to
delta
conversion
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2
answers
asked
Apr 11, 2020
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anonymous
Delta to Wye Conversion
Delta to Wye Conversion
Last answer:
Delta to Wye Conversion
delta
to
wye
conversion
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59
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2
answers
asked
Mar 2, 2020
by
anonymous
Star to delta conversion examples
Star to delta conversion examples
Last answer:
Star to delta conversion example 1
star
to
delta
conversion
examples
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1
answer
asked
Jun 11, 2019
by
anonymous
Wye and delta conversion formula
Wye and delta conversion formula
Last answer:
Wye and delta conversion formula
wye
and
delta
conversion
formula
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1
answer
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