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What is meant by firing angle of thyristor?
asked
Mar 19, 2018
by
anonymous
What is meant by firing angle of thyristor?
firing
angle
thyristor
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1
Answer
answered
Jul 1, 2018
by
anonymous
The point at which SCR is triggered is known as firings angle of thyristor.
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asked
Dec 7, 2017
by
anonymous
what is firing angle?
what is firing angle?
Last answer:
Firing angle is time in electrical degrees from the instant the valve voltage is positive to the application of firing pulse to the valve (start of conduction). Also called delay angle.
firing
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Apr 29, 2018
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When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a
When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is
Last answer:
When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2
firing
angle
single-phase
fully
controlled
rectifier
feeding
constant
direct
current
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Sep 16, 2019
by
anonymous
Define: i) Firing angle ii) Conduction angle
Define: i) Firing angle ii) Conduction angle
Last answer:
(i) Conduction Angle (β): Conduction angle is defined as the angle between the instant the SCR is triggered or turned on and the instant at which the SCR is turned off. Assuming that the SCR ... maximum average output voltage to the angle when the SCR is actually triggered or fired by gate pulse.
firing
angle
conduction
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asked
Mar 19, 2018
by
anonymous
What is the use of a thyristor in a circuit?
What is the use of a thyristor in a circuit?
use
thyristor
circuit
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Mar 19, 2018
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What is the function of a thyristor?
What is the function of a thyristor?
function
thyristor
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asked
Mar 19, 2018
by
anonymous
What is the application of thyristor?
What is the application of thyristor?
application
thyristor
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asked
May 8, 2018
by
anonymous
Thyristor can be protected from over voltages by using
Thyristor can be protected from over voltages by using
Last answer:
Thyristor can be protected from over voltages by using Voltage clamping device
thyristor
protected
over
voltages
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1
answer
asked
Mar 19, 2018
by
anonymous
What is a phase control thyristor?
What is a phase control thyristor?
phase
control
thyristor
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answers
asked
Mar 19, 2018
by
anonymous
What is thyristor family?
What is thyristor family?
thyristor
family
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asked
Mar 19, 2018
by
anonymous
What is a reverse conducting thyristor?
What is a reverse conducting thyristor?
reverse
conducting
thyristor
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asked
Aug 8, 2017
by
anonymous
what is gate turn off thyristor (GTO)?
Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.
Last answer:
Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).
gto
gate
turn
off
thyristor
voltage
current
waveform
switching
characteristics
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asked
Dec 6, 2017
by
anonymous
what are the disadvantages of thyristor?
what are the disadvantages of thyristor?
Last answer:
Disadvantages of thyristor The silicon controlled rectifier (SCR) is unidirectional devices, so it can control power only in DC power during positive half cycle of AC supply. Thus only DC power is ... cycle. It cannot be used at higher frequencies. The gate current cannot be negative
disadvantages
thyristor
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asked
Sep 21, 2017
by
anonymous
What is mean by forced commutation of thyristor?
Last answer:
By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.
forced
commutation
thyristor
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asked
Sep 21, 2017
by
anonymous
What is mean by natural commutation of thyristor?
Last answer:
Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply ... connected to positive and anode terminal get connected to negative, this turns off the thyristor.
natural
commutation
thyristor
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asked
Mar 19, 2018
by
anonymous
Why SCR is called as thyristor?
Why SCR is called as thyristor?
scr
thyristor
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asked
Mar 19, 2018
by
anonymous
Is a SCR a thyristor?
Is a SCR a thyristor?
Last answer:
Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.
scr
thyristor
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asked
Mar 19, 2018
by
anonymous
How is a thyristor used to convert AC to DC?
How is a thyristor used to convert AC to DC?
thyristor
used
convert
ac
dc
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asked
Mar 6, 2018
by
anonymous
Is thyristor a DC switch?
Last answer:
Yes ,it is one of the main advantage using thristors as a switch in DC circuit ,it has a high current gain
thyristor
dc
switch
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2
answers
asked
Mar 21, 2018
by
anonymous
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is?
Last answer:
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.
capacitor
leads
voltage
loss
angle
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asked
Dec 7, 2017
by
anonymous
parallel operation of mosfet can be done more easily as compared to thyristor. why?
parallel operation of MOSFET can be done more easily as compared to thyristor. why?
Last answer:
Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In ... the parallel operation of MOSFET can be done more easily as compared to the thyristor.
mosfet
thyristor
parallel
operation
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asked
May 8, 2018
by
anonymous
Leakage current flows through the thyristor in
Leakage current flows through the thyristor in
Last answer:
Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.
leakage
current
flows
thyristor
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1
answer
asked
Mar 19, 2018
by
anonymous
Why thyristor are not preferred for inverter?
Why thyristor are not preferred for inverter?
thyristor
preferred
inverter
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answers
asked
Feb 19, 2018
by
anonymous
Explain thyristor gate drive circuit.
Explain thyristor gate drive circuit.
Last answer:
Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.
thyristor
gate
drive
circuit
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asked
Nov 15, 2017
by
anonymous
write short notes on thyristor CSI .
write short notes on thyristor CSI .
Last answer:
Current-source inverter (CSI) is an inverter with a DC current input. Current source inverters are most commonly used in very high power AC motor drives.
thyristor
csi
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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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answer
asked
Mar 18, 2018
by
anonymous
What is the maximum value of torque angle in synchronous motor?
What is the maximum value of torque angle in synchronous motor?
Last answer:
The maximum value of torque angle in synchronous motor is 90 degrees electrical.
maximum
torque
angle
synchronous
motor
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735
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1
answer
asked
Mar 10, 2018
by
anonymous
What is power factor angle?
What is power factor angle?
power
factor
angle
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0
answers
asked
Mar 25, 2018
by
anonymous
What will be the phase angle between two alternating waves of equal frequency...
What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?
Last answer:
90° will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value.
phase
angle
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319
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1
answer
asked
Sep 10, 2017
by
anonymous
thyristor can be turned off by?
Last answer:
Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.
thyristor
turned
off
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1
answer
asked
Sep 10, 2017
by
anonymous
what is thyristor commutation?
Last answer:
Thyristor commutation means turning off thyristor.
thyristor
commutation
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1
answer
asked
Apr 30, 2018
by
anonymous
Phase margin is the amount of angle to make the system
Phase margin is the amount of angle to make the system (1) Oscillatory (2) Stable (3) Unstable (4) Exponential
Last answer:
Phase margin is the amount of angle to make the system Unstable
phase
margin
amount
angle
make
system
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135
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1
answer
asked
Mar 25, 2018
by
anonymous
The product of apparent power and cosine of the phase angle between circuit voltage and current is?
The product of apparent power and cosine of the phase angle between circuit voltage and current is?
Last answer:
In parllpar reasonans RLC circuit the current is
apparent
power
cosine
phase
angle
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2
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asked
Mar 24, 2018
by
anonymous
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
Last answer:
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of 45 degrees.
rms
sinusoidal
ac
current
value
angle
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answer
asked
Mar 24, 2018
by
anonymous
Two waves of the same frequency have opposite phase when the phase angle between them is?
Two waves of the same frequency have opposite phase when the phase angle between them is?
Last answer:
Two waves of the same frequency have opposite phase when the phase angle between them is 180°.
waves
frequency
opposite
phase
angle
between
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182
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1
answer
asked
Mar 22, 2018
by
anonymous
Tangent of angle of friction is equal to?
Tangent of angle of friction is equal to?
Last answer:
Tangent of angle of friction is equal to coefficient of friction.
tangent
angle
friction
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1
answer
asked
Mar 22, 2018
by
anonymous
Angle of friction is the?
Angle of friction is the?
Last answer:
Angle of friction is the angle between normal reaction and the resultant of normal reaction and the limiting friction.
angle
friction
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1
answer
asked
Mar 20, 2018
by
anonymous
The coupling angle or load angle of synchronous motor is defined as the angle between the?
Last answer:
The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.
coupling
angle
load
synchronous
motor
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1
answer
asked
Apr 28, 2018
by
anonymous
Torque angle for the synchronous machine is the angle between
Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop
Last answer:
Torque angle for the synchronous machine is the angle between rotor magnetic field and net magnetic field in the air gap
torque
angle
synchronous
machine
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1
answer
asked
Mar 18, 2018
by
anonymous
The synchronous motor will develop maximum power when the load angle is?
The synchronous motor will develop maximum power when the load angle is?
Last answer:
The synchronous motor will develop maximum power when the load angle is 900.
synchronous
motor
develop
maximum
power
load
angle
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1
answer
asked
Apr 28, 2018
by
anonymous
The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu
The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu, 0.866 pu (B) 0.866 pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu
Last answer:
The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are 0.866 pu, 0.5 pu
synchronous
power
factor
angle
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1
answer
asked
May 18, 2018
by
anonymous
A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25 and an
A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is (A) 0.78 (B) 0.827 (C) 0.866 (D) 0.9
Last answer:
A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is 0.78
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1
answer
asked
Apr 14, 2018
by
anonymous
A single phase fully controlled thyristor bridge ac -dc converter is operating at a firing angle of 25 degree...
A single phase fully controlled thyristor bridge ac -dc converter is operating at a firing angle of 25 degree and an overlap angle 10 degree with constant dc output current of 20A. The fundamental power factor (displacement factor) at input ac mains is : (A) 0.78 (B) 0.827 (C) 0.866 (0) 0.9
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answers
asked
May 30, 2019
by
anonymous
How to find total impedance Z, current I and Impedance angle ?
How to find total impedance Z, current I and Impedance angle ?
Last answer:
How to find total impedance Z, current I and Impedance angle ?
how
to
find
total
impedance
z
current
i
and
angle
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109
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2
answers
asked
Sep 10, 2017
by
anonymous
why thyristor is called semi controlled device?
Last answer:
Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.
thyristor
semi
controlled
device
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1
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asked
Sep 10, 2017
by
anonymous
why thyristor is called latching device?
Last answer:
Thyristor can be turn on by positive gate pulse and the current will continue to flow through the device even when the gate voltage is low hence thyristor is called latching device.
thyristor
latching
device
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1
answer
asked
May 3, 2020
by
anonymous
Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
Last answer:
Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.
describe
the
working
principle
of
thyristor
operated
dimmer
with
help
circuit
diagram
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1
answer
asked
Sep 21, 2017
by
anonymous
can we turn off thyristor using Gate?
Last answer:
No we cannot turn off normal thyristor using Gate.
thyristor
turn
off
using
gate
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1
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asked
Sep 21, 2017
by
anonymous
when a thyristor conducts?
Last answer:
Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.
thyristor
conduct
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asked
Sep 21, 2017
by
anonymous
thyristor have how many terminals?
Last answer:
Thyristor have three terminals anode, cathode and Gate.
terminals
thyristor
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asked
Aug 9, 2017
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anonymous
Thyristor Switched Capacitor (TSC)
Thyristor Switched Capacitor (TSC)
Last answer:
Thyristor Switched Capacitor (TSC) TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.
thyristor
switched
capacitor
tsc
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