Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
What is mean by forced commutation of thyristor?
Speak Question
asked
Sep 21, 2017
by
anonymous
forced
commutation
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
89
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
Speak Answer
answered
Sep 21, 2017
by
anonymous
By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
72
views
1
answer
asked
Oct 13, 2019
by
anonymous
Differentiate between Natural and Forced commutation
Differentiate between Natural and Forced commutation
Last answer:
Natural commutation Forced commutation Source is AC Source is DC External commutating componants are not required External commutating componants are required SCR turns off ... in controlled rectifiers, AC voltage controllers etc. Used in choppers & inverters etc
natural
forced
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
1.2k
views
1
answer
asked
Sep 10, 2017
by
anonymous
what is thyristor commutation?
Last answer:
Thyristor commutation means turning off thyristor.
thyristor
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
113
views
1
answer
asked
Dec 31, 2017
by
anonymous
In a thyristor D.C. chopper, which type of commutation results in best performance ?
In a thyristor D.C. chopper, which type of commutation results in best performance ?
Last answer:
voltage commutation
commutation
chopper
thumb_up_alt
1
like
thumb_down_alt
0
dislike
1.2k
views
2
answers
asked
Jul 31, 2019
by
Muzamil
In a GTO, forced turn-off is achieved by applying following voltage/current in the gate 1) +ve voltage 2) +ve current 3) -ve current 4) -ve voltage
gto
forced
turn-off
thumb_up_alt
0
like
thumb_down_alt
0
dislike
143
views
0
answers
asked
Feb 20, 2018
by
anonymous
What is the difference between beta and forced beta for BJT?
What is the difference between beta and forced beta for BJT?
difference
between
bjt
beta
forced
thumb_up_alt
0
like
thumb_down_alt
0
dislike
519
views
0
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
129
views
1
answer
asked
Oct 13, 2019
by
anonymous
Class A Load Commutation
Class A Load Commutation
Last answer:
Class A: Load Commutation: The class A or load commutation (also called self-commutation or resonant commutation) is employed in thyristor circuits supplied from DC source. The commutating components include ... biased. Thus the zero-current and reverse-bias cause the thyristor to turn-off.
class
a
load
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
112
views
1
answer
asked
Sep 7, 2018
by
anonymous
Define natural, mechanical, forced and induced draught systems.
Define natural, mechanical, forced and induced draught systems.
Last answer:
Natural draught system: - When the fuel is burnt (combustion) in the furnace due to natural circulation of air, the draught is called natural draught. Mechanical draught system: - In a mechanical ... combustion. OR If fan/blower is placed after the furnace then it is called as induced draught
define
natural
mechanical
forced
induced
draught
systems
thumb_up_alt
0
like
thumb_down_alt
0
dislike
46
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
173
views
1
answer
asked
May 21, 2020
by
anonymous
Draw circuit diagram of Class B commutation.
Draw circuit diagram of Class B commutation.
Last answer:
Class B: Resonant Pulse Commutation:
circuit
diagram
class
b
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
41
views
1
answer
asked
Oct 13, 2019
by
anonymous
Draw a neat circuit diagram of class F commutation
Draw a neat circuit diagram of class F commutation
Last answer:
class F commutation
class
f
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
65
views
1
answer
asked
Jul 25, 2019
by
anonymous
Define commutation. Give the types of commutation.
Define commutation. Give the types of commutation.
Last answer:
Commutation: The process of turning-off a conducting thyristor is called commutation . Types of Commutation: i) Line commutation (Natural commutation) ii) Load commutation iii) Forced commutation iv) ... Auxiliary commutation v) Class E: External pulse commutation vi) Class F: AC line commutation
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
50
views
1
answer
asked
Mar 20, 2018
by
anonymous
Satisfactory commutation of D.C. machines requires?
Last answer:
Satisfactory commutation of D.C. machines requires brushes should be of proper grade and size, brushes should smoothly run in the holders, smooth, concentric commutator properly undercut.
commutation
dc
machines
requires
thumb_up_alt
0
like
thumb_down_alt
0
dislike
79
views
1
answer
asked
May 21, 2020
by
anonymous
For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.
Last answer:
Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.
class
d
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
58
views
1
answer
asked
Oct 13, 2019
by
anonymous
Class D commutation
Class D commutation
Last answer:
Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.
class
d
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
67
views
1
answer
asked
Jul 25, 2019
by
anonymous
Explain auxiliary commutation with a neat diagram. Also draw its waveform.
Explain auxiliary commutation with a neat diagram. Also draw its waveform.
Last answer:
Auxiliary Commutation At start, the Ta is triggered and turned on to carry the load current. Due to the resonant circuit R-L-C, the current initially rises, attains peak and then falls to ... , the firing of auxiliary SCR commutates the main SCR, hence name is auxiliary commutation.
auxiliary
commutation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
113
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
1
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
70
views
1
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
81
views
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
thumb_up_alt
1
like
thumb_down_alt
0
dislike
97
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.8k
views
0
answers
asked
Mar 19, 2018
by
anonymous
What is the function of a thyristor?
What is the function of a thyristor?
function
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
72
views
0
answers
asked
Mar 19, 2018
by
anonymous
What is the application of thyristor?
What is the application of thyristor?
application
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
73
views
0
answers
asked
Mar 19, 2018
by
anonymous
What is a phase control thyristor?
What is a phase control thyristor?
phase
control
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
138
views
0
answers
asked
Mar 19, 2018
by
anonymous
What is thyristor family?
What is thyristor family?
thyristor
family
thumb_up_alt
0
like
thumb_down_alt
0
dislike
56
views
0
answers
asked
Mar 19, 2018
by
anonymous
What is a reverse conducting thyristor?
What is a reverse conducting thyristor?
reverse
conducting
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
70
views
0
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
1.6k
views
1
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
thumb_up_alt
1
like
thumb_down_alt
0
dislike
764
views
2
answers
asked
Mar 19, 2018
by
anonymous
Why SCR is called as thyristor?
Why SCR is called as thyristor?
scr
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
81
views
0
answers
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
143
views
1
answer
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
96
views
0
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
134
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
947
views
1
answer
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
thumb_up_alt
1
like
thumb_down_alt
0
dislike
608
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
176
views
1
answer
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
thumb_up_alt
2
like
thumb_down_alt
0
dislike
264
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
159
views
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
432
views
0
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2.8k
views
1
answer
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
thumb_up_alt
1
like
thumb_down_alt
0
dislike
89
views
2
answers
asked
Sep 21, 2017
by
anonymous
thyristor have how many terminals?
Last answer:
Thyristor have three terminals anode, cathode and Gate.
terminals
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
46
views
1
answer
asked
Aug 9, 2017
by
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
thumb_up_alt
0
like
thumb_down_alt
0
dislike
170
views
1
answer
asked
Aug 8, 2017
by
anonymous
what is TCSC?
what is TCSC?
Last answer:
Thyristor Controlled Series Capacitor (TCSC)
tcsc
thyristor
controlled
series
capacitor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
206
views
1
answer
asked
Sep 25, 2017
by
anonymous
what is mean by nano meter technology ?
Last answer:
Nanometer is a ametric measure of distance equivalent to one billionth of a meter.
vlsi
nano
meter
technology
thumb_up_alt
0
like
thumb_down_alt
0
dislike
70
views
2
answers
asked
Sep 24, 2017
by
anonymous
What is mean by photolithography in VLSI?
Last answer:
Optical lithography method that uses light to print a pattern in a photosensitive material is also called photolithography.
photolithography
vlsi
thumb_up_alt
0
like
thumb_down_alt
0
dislike
82
views
2
answers
asked
Sep 21, 2017
by
anonymous
What is mean by power switching devices?
What is mean by power switching devices?
Last answer:
Power switching devices means like BJT, power MOSFET, SCR, TRIAC, GTO etc.
power
switching
devices
thumb_up_alt
0
like
thumb_down_alt
0
dislike
59
views
1
answer
asked
Oct 12, 2017
by
pavan
explain TCPAR & voltage regulator
Thyristor controlled phase angle regulator
Last answer:
Thyristor controlled phase angle regulator
thyristor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
142
views
1
answer
asked
May 2, 2020
by
anonymous
What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.
What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.
Last answer:
Active Filter: Active Filter is formed by using active element along with the passive components. Advantages of Active filter over Passive filter: High value of pass band gain can be obtained. It is ... pass band. Stop Band Filter: The frequency range which is attenuated is known as stop band.
active
filter
state
its
advantages
over
passive
define
pass
band
&
stop
with
respect
to
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Oct 23, 2020
by
anonymous
What is mean by electric vehicle?
What is mean by electric vehicle?
thumb_up_alt
0
like
thumb_down_alt
0
dislike
17
views
0
answers
...