x

thyristor can be turned off by?

135 views

1 Answer

Answer :

Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.
Like 0 like

Please log in or register to answer this question.

Related Questions


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 

Show More

188 views 0 answers



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 

Show More

244 views 1 answer




Last Answer : SCR turned off when the anode current falls below holding current.

Show More

925 views 1 answer




Last Answer : No we cannot turn off normal thyristor using Gate.

Show More

93 views 1 answer



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).

Show More

1.7k views 1 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 (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

Show More

174 views 1 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
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

Show More

90 views 1 answer




Last Answer : Thyristor have three terminals anode, cathode and Gate.

Show More

58 views 1 answer




Last Answer : Thyristor commutation means turning off thyristor.

Show More

145 views 1 answer




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.

Show More

1.1k views 1 answer




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.

Show More

918 views 1 answer



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.

Show More

368 views 1 answer



Thyristor can be protected from over voltages by using
Last Answer : Thyristor can be protected from over voltages by using Voltage clamping device

Show More

108 views 1 answer



Leakage current flows through the thyristor in
Last Answer : Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.

Show More

211 views 1 answer



What is a phase control thyristor?

Show More

153 views 0 answers



Why thyristor are not preferred for inverter?

Show More

455 views 0 answers



What is thyristor family?

Show More

67 views 0 answers



What is meant by firing angle of thyristor?
Last Answer : The point at which SCR is triggered is known as firings angle of thyristor.

Show More

235 views 1 answer



What is the use of a thyristor in a circuit?

Show More

2.9k views 0 answers



What is a reverse conducting thyristor?

Show More

87 views 0 answers



What is the function of a thyristor?

Show More

93 views 0 answers



Why SCR is called as thyristor?

Show More

97 views 0 answers



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.

Show More

162 views 1 answer



How is a thyristor used to convert AC to DC?
Last Answer : thyristor

Show More

123 views 1 answer



What is the application of thyristor?

Show More

90 views 0 answers




Last Answer : Yes ,it is one of the main advantage using thristors as a  switch in DC  circuit ,it has a high current gain

Show More

161 views 2 answers



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.

Show More

3.0k views 1 answer



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.

Show More

300 views 1 answer



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

Show More

888 views 2 answers



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.

Show More

107 views 2 answers




Last Answer : By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.

Show More

119 views 1 answer




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.

Show More

110 views 1 answer




Last Answer : Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.

Show More

97 views 1 answer



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.

Show More

203 views 1 answer



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.

Show More

123 views 1 answer




Last Answer : The fuse blows off by melting.

Show More

73 views 1 answer



What is meant by pinch off voltage in MOSFET?

Show More

102 views 0 answers



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.  

Show More

3.5k views 1 answer




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.

Show More

104 views 1 answer



drive the expression for the  (1)current that commutates the scr, (2)the peak current, (3) conduction time?  in class B,C,D and E.

Show More

4 views 0 answers



Thyristor controlled phase angle regulator
Last Answer : Thyristor controlled phase angle regulator

Show More

196 views 1 answer



what is TCSC?
Last Answer : Thyristor Controlled Series Capacitor (TCSC)

Show More

224 views 1 answer



How can a thyristor turned off?
Last Answer : A thyristor can be turned off by making the current flowing through it to zero.

Show More

2 views 1 answer



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

Show More

126 views 1 answer



Why circuit turn off time should be greater than the thyristor turn-off time?
Last Answer : Circuit turn off time should be greater than the thyristor turn-off time for reliable turn-off, otherwise the device may turn-on at an undesired instant, a process called commutation failure.

Show More

2 views 1 answer



Gate turn-off thyristor (GTO)

Show More

20 views 0 answers



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

Show More

145 views 1 answer



60 views 0 answers



46 views 0 answers



What is the difference between SCR and thyristor?
Last Answer : SCR is a type of thyristor. Like GTO, IGCT, MCT, TRIAC, DIAC etc. are the types of thyristor.

Show More

2.7k views 2 answers


Show More⇦ PreviousNext ⇨