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Is a SCR a thyristor?
asked
Mar 19, 2018
by
anonymous
Is a SCR a thyristor?
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thyristor
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1
Answer
answered
Jun 25, 2018
by
anonymous
Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.
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asked
Mar 19, 2018
by
anonymous
Why SCR is called as thyristor?
Why SCR is called as thyristor?
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What is a phase control thyristor?
What is a phase control thyristor?
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What is the use of a thyristor in a circuit?
What is the use of a thyristor in a circuit?
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Mar 19, 2018
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What is a reverse conducting thyristor?
What is a reverse conducting thyristor?
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asked
Mar 19, 2018
by
anonymous
What is the function of a thyristor?
What is the function of a thyristor?
function
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answers
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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answers
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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asked
Jul 25, 2019
by
anonymous
Draw a neat labelling V-I characteristics of SCR and explain the region
Draw a neat labelling V-I characteristics of SCR and explain the region
Last answer:
(i) Latching current: It is the minimum anode current required to maintain the SCR in the conduction state just after turn-on and the gate signal has been removed. (ii) Holding current: It is the minimum anode current required to hold the conducting SCR in the ON state.
scr
characteristics
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answers
asked
Apr 28, 2018
by
anonymous
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last answer:
A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V
phase
controlled
single-phase
full-controlled
scr
bridge
converter
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answer
asked
Apr 28, 2018
by
anonymous
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load,
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses
Last answer:
In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses
single-phase
scr
bridge
converter
operating
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asked
Oct 13, 2019
by
anonymous
How GTO is advantages over SCR
How GTO is advantages over SCR
Last answer:
i) It is turned-off by negative gate pulse. ii) No commutation circuit required, reducing the cost, size, weight and volume of the circuit. iii) As commutation choke is not used, the associated acoustic ... turn off time permits high switching frequency. v) It has higher di/dt rating at turn-off.
gto
advantages
scr
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asked
Apr 29, 2018
by
anonymous
SCR is more utilized as compared to Triac because it is
SCR is more utilized as compared to Triac because it is
Last answer:
SCR is more utilized as compared to Triac because it is available with higher ratings
scr
triac
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answer
asked
Apr 28, 2018
by
anonymous
An SCR without any external connections is considered as
An SCR without any external connections is considered as (A) two diodes in series (B) three diodes in series (C) two n-p-n transistors in series (D) two p-n-p transistors in series
Last answer:
An SCR without any external connections is considered as three diodes in series
scr
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asked
Mar 6, 2018
by
anonymous
Is SCR unidirectional switch?
Last answer:
Yes, SCR is a unidirectional switch.
scr
unidirectional
switch
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asked
Feb 3, 2018
by
anonymous
What is holding current and latching current in SCR ?
What is holding current and latching current in SCR? Draw the gate characteristics of an SCR and explain the characteristics. What are the different signals which can be used for turning on SCR by gate control? compare them.
Last answer:
(i) Holding Current: Holding current is defined as the minimum anode current required to maintain conducting SCR in the on-state. (ii) Latching Current: Latching current is defined as the ... the on-state immediately after the SCR has been turned on and the gate signal has been removed.
holding
current
latching
scr
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asked
Dec 9, 2017
by
anonymous
What is the use of SCR?
What is the use of SCR?
Last answer:
SCR are use in lamp dimming, power regulators, motor control, rectifications of high power AC, control of welding machines and also use as switch these are some uses of silicon controlled rectifier.
use
scr
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answer
asked
Mar 19, 2018
by
anonymous
What is thyristor family?
What is thyristor family?
thyristor
family
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answers
asked
Mar 19, 2018
by
anonymous
What is meant by firing angle of thyristor?
What is meant by firing angle of thyristor?
Last answer:
The point at which SCR is triggered is known as firings angle of thyristor.
firing
angle
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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answers
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
May 21, 2020
by
anonymous
Explain triggering of SCR using opto-coupler. State its advantages.
Explain triggering of SCR using opto-coupler. State its advantages.
Last answer:
Triggering of SCR using opto-coupler: A simple opto-coupler based triggering circuit for SCR is shown in the figure. An optocoupler or opto-isolator is a combination of light source ... is small size and light weight device. iii)Interfacing with logic circuits is easily possible.
triggering
scr
opto-coupler
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1
answer
asked
May 21, 2020
by
anonymous
Draw the circuit diagram of battery charger using SCR and explain it’s working.
Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last answer:
Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.
circuit
diagram
battery
charger
scr
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answer
asked
May 21, 2020
by
anonymous
Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Last answer:
Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on.
thermal
triggering
method
scr
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answer
asked
Oct 13, 2019
by
anonymous
Explain working of AC circuit breaker using SCR with circuit diagram.
Explain working of AC circuit breaker using SCR with circuit diagram.
Last answer:
AC Circuit Breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.
working
ac
circuit
breaker
scr
diagram
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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
Oct 13, 2019
by
anonymous
Compare SCR and TRIAC
Compare SCR and TRIAC
Last answer:
SCR TRIAC It is an unidirectional device. It is a bidirectional device. It is turned-on by only positive gate current. It can be turned-on by either ... applications including lamp dimmer, heating control, zero voltage switched AC relay, small AC motor control etc.
scr
triac
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1
answer
asked
Oct 13, 2019
by
anonymous
Describe triggering of SCR using UJT relaxation oscillator.
Describe triggering of SCR using UJT relaxation oscillator.
Last answer:
Triggering of SCR using UJT relaxation oscillator:
triggering
scr
ujt
relaxation
oscillator
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1
answer
asked
Jul 25, 2019
by
anonymous
Draw construction of SCR using two transistor model. Explain its operation.
Draw construction of SCR using two transistor model. Explain its operation.
Last answer:
Two Transistor Model of SCR or Thyristor
two
transistor
model
construction
scr
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1
answer
asked
Jun 18, 2018
by
anonymous
The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of
The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz
scr
turned
off
voltage
reversal
anode-cathode
ac
supply
frequency
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answers
asked
Mar 6, 2018
by
anonymous
SCR turned off when the anode current falls below?
Last answer:
SCR turned off when the anode current falls below holding current.
scr
turned
off
anode
current
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answer
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
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
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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answer
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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2
answers
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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2
answers
asked
Apr 28, 2018
by
anonymous
In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR
In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell
Last answer:
In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in voltage notching
3-phase
converter
circuit
commutation
scr
phase
turned
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1
answer
asked
Apr 28, 2018
by
anonymous
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α
Last answer:
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ
no-load
speed
single-phase
scr
bridge
converter
fed
separately
excited
dc
motor
operating
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1
answer
asked
Jun 18, 2018
by
anonymous
An inductor is connected in series with SCR to protect it from
An inductor is connected in series with SCR to protect it from A) Excessive high voltage B) Excessive high dv/dt C) Excessive high di/dt D) Excessive large forward current
Last answer:
An inductor is connected in series with SCR to protect it from Excessive high di/dt
inductor
series
scr
protect
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answer
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
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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answer
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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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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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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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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answer
asked
Jan 2
by
anonymous
Purpose of Selective Catalytic Reduction (SCR)
Purpose of Selective Catalytic Reduction (SCR)
Last answer:
Purpose of Selective Catalytic Reduction (SCR) : 1. It reduces Nox 75% to 90% 2. Converts it in to molecular nitrogen and water vapor 3. It reduces HC emission up to 80% 4. It reduces PM emission 20 to 25%.
purpose
selective
catalytic
reduction
scr
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answer
asked
Mar 15, 2018
by
anonymous
How do you test an SCR?
How do you test an SCR?
test
scr
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answers
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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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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