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What is a reverse conducting thyristor?

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Description : What is the difference between forward and reverse bias?

Answer : Forward bias is a PN junction bias which allows current to flow through the junction. Forward bias decreases the resistance of the depletion layer. Reverse bias is a PN junction bias that allows only ... Positive polarity on the n-type material and negative polarity to the p-type material.

Description : The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR

Answer : The device which allows reverse power flow and withstands highest switch frequency is MOSFET

Description : State any four properties of conducting materials.

Answer : Electrical properties of conductivity materials: i) Low resistivity. ii) Low temperature coefficient of resistance. iii) High conductivity. iv) Low heat dissipation.  Mechanical properties of ... properties of conductivity materials: i) Adequate resistant to corrosion. ii) Low oxidation. 

Description : The electric field inside a hollow conducting sphere ________ A) Depends on the diameter of the sphere  B) Varies according to the direction of earth’s magnetic poles C) Is zero  D) None of these

Answer : The electric field inside a hollow conducting sphere Is zero

Description : What is a phase control thyristor?

Description : What is thyristor family?

Description : What is meant by firing angle of thyristor?

Answer : The point at which SCR is triggered is known as firings angle of thyristor.

Description : What is the use of a thyristor in a circuit?

Description : What is the function of a thyristor?

Description : What is the application of thyristor?

Description : what are the disadvantages of thyristor?

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

Description : Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.

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).

Description : Thyristor can be protected from over voltages by using

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

Description : Leakage current flows through the thyristor in

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

Description : Why thyristor are not preferred for inverter?

Description : Why SCR is called as thyristor?

Description : Is a SCR a thyristor?

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.

Description : How is a thyristor used to convert AC to DC?

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

Description : Explain thyristor gate drive circuit.

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.

Description : parallel operation of MOSFET can be done more easily as compared to thyristor. why?

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.

Description : write short notes on thyristor CSI .

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.

Description : What happens when you reverse the direction of the current in an electromagnet?

Answer : When  you  reverse  current  direction  in  an  electromagnet,  the magnetic  poles  will  also  change.

Description : what is reverse power relay?

Answer : Thereverse powerrelay is a directional protective relay that prevents power from flowing in the reverse direction. Read our article going back ... it all to be up to date. And if you do, read it anyway just to check if youreallydo!

Description : A diode in which the change in reverse bias voltage varies the capacitance is called as A) Varactor diode B) Switching diode C) Tunnel diode D) Zener-diode  

Answer : A diode in which the change in reverse bias voltage varies the capacitance is called as Varactor diode

Description : How can we reverse the direction of rotation of synchronous motor?

Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.

Answer : In cut-off region of BJT both the emitter-base junction and collector-base junction are reverse biased.

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

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.

Answer : Thyristor commutation means turning off thyristor.

Description : Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.

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.

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

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

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

Description : thyristor can be turned off by?

Answer : Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.

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.

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.

Description : Thyristor Switched Capacitor (TSC)

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.

Description : what is TCSC?

Answer : Thyristor Controlled Series Capacitor (TCSC)

Description : Thyristor controlled phase angle regulator

Answer : Thyristor controlled phase angle regulator

Description : The conducting SCR turns-off when the on-state current is (A) below the latching current (B) below the holding current (C) equal to the reverse leakage current (D) zero 

Description : An SCR starts conducting with appreciable current when

Answer : An SCR starts conducting with appreciable current when anode and gate both are positive

Description : In a single-phase full converter, the number of SCRs conducting during overlap is   (a) 1 (b) 2 (c) 3 (d) 4 

Answer : 4

Description : Is gate turn on mechanism of GTO is similar to conventional thyristor?

Answer : Yes gate turn on mechanism of GTO is similar to conventional thyristor.

Description : A thyristor is triggered by a pulse train of 5 kHz. The duty ratio is 0.4. If the allowable average power is 100 W, the maximum allowable gate drive power will be 

Description : In a thyristor, the magnitude of anode current will:

Answer : In a thyristor, the magnitude of anode current will: Not change with any variation in gate current

Description : 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

Answer : A thyristor (SCR) turns off when the Thyristor current is below holding value

Description : Turn-on of a thyristor (SCR) takes place when  A) Anode to cathode voltage is positive B) Anode to cathode voltage is negative C) Positive current is applied to gate D) Anode to cathode voltage is positive and positive current pulse is applied to gate

Answer : Turn-on of a thyristor (SCR) takes place when Anode to cathode voltage is positive and positive current pulse is applied to gate

Description : The number of p-n junctions in a thyristor are  A)1 B) 2 C) 3 D) 4

Answer : The number of p-n junctions in a thyristor are  3

Description : Anode current in an thyristor is made up of   (A) electrons only (B) electrons or holes (C) electrons and holes (D) holes only

Answer : Anode current in an thyristor is made up of electrons and holes 

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