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thyristor can be turned off by?
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Sep 10, 2017
by
anonymous
thyristor
turned
off
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answered
Sep 21, 2017
by
anonymous
Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.
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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
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voltage
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anode-cathode
ac
supply
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Jun 18, 2018
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How is the GTO turned off?
How is the GTO turned off? A) By using a commutation circuit B) By applying reverse gate pulse C) By using a latch-up circuit D) By reverse anode current pulse
Last answer:
How is the GTO turned off? A) By using a commutation circuit B) By applying reverse gate pulse C) By using a latch-up circuit D) By reverse anode current pulse
gto
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Mar 6, 2018
by
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SCR turned off when the anode current falls below?
Last answer:
SCR turned off when the anode current falls below holding current.
scr
turned
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current
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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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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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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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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
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asked
May 8, 2018
by
anonymous
A 100-watt light bulb turned on for 8 hours uses :
A 100-watt light bulb turned on for 8 hours uses : (A) 800 Wh (B) 0.8 kWh (C) 8 kWh (D) None of the above
Last answer:
A 100-watt light bulb turned on for 8 hours uses : (A) 800 Wh (B) 0.8 kWh (C) 8 kWh (D) None of the above
light
bulb
turned
uses
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1
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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
Sep 21, 2017
by
anonymous
how can we turn on and turn off GTO?
Last answer:
GTO can be turned on by providing positive pulse to the gate terminal and it can be turn off by providing negative pulse to gate terminal.
gto
turn
on
off
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asked
Mar 20, 2018
by
anonymous
The fuse blows off by?
Last answer:
The fuse blows off by melting.
fuse
blows
off
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asked
Mar 19, 2018
by
anonymous
What is meant by pinch off voltage in MOSFET?
What is meant by pinch off voltage in MOSFET?
pinch
off
voltage
mosfet
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asked
Sep 5, 2018
by
anonymous
Define pinch off voltage and drain resistance of FET.
Define pinch off voltage and drain resistance of FET.
Last answer:
1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any ... drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.
define
pinch
off
voltage
drain
resistance
fet
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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
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
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
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control
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ac
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Apr 11, 2018
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The silicon -controlled rectifier can be turned off : -
The silicon -controlled rectifier can be turned off : - a) by a negative gate pulse b) by forced commutation c) with the off switch d) when the breakover voltage is exceeded
Last answer:
The silicon -controlled rectifier can be turned off : - by forced commutation
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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
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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asked
May 16, 2018
by
anonymous
An SCR can only be turned off via it's
An SCR can only be turned off via it's (A) cathode (B) anode (C) gates (D) none
Last answer:
An SCR can only be turned off via it's anode
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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
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
What is a phase control thyristor?
What is a phase control thyristor?
phase
control
thyristor
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0
answers
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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0
answers
asked
Mar 19, 2018
by
anonymous
What is thyristor family?
What is thyristor family?
thyristor
family
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0
answers
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
by
anonymous
What is a reverse conducting thyristor?
What is a reverse conducting thyristor?
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
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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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
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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
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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
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
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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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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
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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
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
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
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1
answer
asked
Jan 10
by
anonymous
Two pumps M and N can separately fill a dumper in 36 minutes and 45 minutes respectively. Both the pumps are opened together but 12 minutes after the start the pump M is turned off. How much time will it take to fill the dumper? A) 9 min B) 10 min C) 30 min D) 32 min
Two pumps M and N can separately fill a dumper in 36 minutes and 45 minutes respectively. Both the pumps are opened together but 12 minutes after the start the pump M is turned off. How much time will it take to fill the dumper? A) 9 min B) 10 min C) 30 min D) 32 min
Last answer:
C 12/36 + x/45 = 1 (12*5)/180+4x/180=1 60+4x=180 4x=120 X=120/4=30min
pipes-and-cistern
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asked
Jan 10
by
anonymous
Two pipes, Xand Y can fill a tank in 36 and 30 minutes respectively. Both are opened together, but at the end of 3minutes, X is turned off. In how many more minutes will Y fill the cistern? A) 7(24/5) B) 7(1/2) C) 24(1/3) D) 8(1/4)
Two pipes, Xand Y can fill a tank in 36 and 30 minutes respectively. Both are opened together, but at the end of 3minutes, X is turned off. In how many more minutes will Y fill the cistern? A) 7(24/5) B) 7(1/2) C) 24(1/3) D) 8(1/4)
Last answer:
C X can fill cistern in 36 minutes. X fills cistern in 1 minute = 1/36 Y can fill cistern in 30 minutes. Y fills cistern in 1 minute = 1/30 part. Xand Y together can fill cistern in 1 minute, = {(1/ ... part. 147/180 part cistern must be filled by Y in, [(147/180)/(1/30)] = 24(1/3) minutes.
pipes-and-cistern
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asked
Jan 10
by
anonymous
Taps P, Q and R can fill a tank in 3, 4 and 5 hours respectively. If all the taps are opened together and after 30 minutes taps Q and R are turned off, find the total time in which the tank is full. A) 2(3/8)hrs B) 1(1/7)hrs C) 2(13/40)hrs D) 3(13/43)hrs
Taps P, Q and R can fill a tank in 3, 4 and 5 hours respectively. If all the taps are opened together and after 30 minutes taps Q and R are turned off, find the total time in which the tank is full. A) 2(3/8)hrs B) 1(1/7)hrs C) 2(13/40)hrs D) 3(13/43)hrs
Last answer:
C In 1 hr P, Q, R = 1/3+1/4+1/5 = 20+15+12/60 = 47/60 Filled in 30m = 47/120 Remaining = 1-47/120 =73/120 Tap P = 3*73/120= 219/120 Total = 219/120+1/2 =219+60 /120= 279/120= 2 13/40 hrs
pipes-and-cistern
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asked
Oct 12, 2017
by
pavan
explain TCPAR & voltage regulator
Thyristor controlled phase angle regulator
Last answer:
Thyristor controlled phase angle regulator
thyristor
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asked
Aug 8, 2017
by
anonymous
what is TCSC?
what is TCSC?
Last answer:
Thyristor Controlled Series Capacitor (TCSC)
tcsc
thyristor
controlled
series
capacitor
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asked
Apr 25, 2018
by
anonymous
The turn-off time of a thyristor is 30 is at 50°C. What is its turn-off time at 100°C ?
The turn-off time of a thyristor is 30 is at 50°C. What is its turn-off time at 100°C ?
Last answer:
The turn-off time of a thyristor is 30 is at 50°C. What is its turn-off time at 100°C ? 60 microsecond
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Apr 9, 2018
by
anonymous
What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of...
What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of 0.2 for a 36 MHZ transponder? A) 7.2 Mbps B) 30 Mbps C) 43.2 Mbps D) 60 Mbps
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asked
Jun 11, 2020
by
anonymous
Gate turn-off thyristor (GTO)
Gate turn-off thyristor (GTO)
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asked
May 20, 2018
by
anonymous
A thyristor (SCR) turns off when the
A thyristor (SCR) turns off when the A) Gate pulse is removed B) Gate pulse is applied C) Thyristor current is below holding value D) Anode voltage is made negative
Last answer:
A thyristor (SCR) turns off when the Thyristor current is below holding value
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...