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when a thyristor conducts?

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Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.
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when a diode conducts?
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Diode conducts when the anode voltage is greater than the cathode voltage.

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asked Sep 21, 2017 by anonymous
What is mean by forced commutation of thyristor?
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Answer :

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

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asked Sep 21, 2017 by anonymous
What is mean by natural commutation of thyristor?
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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.

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asked Sep 21, 2017 by anonymous
can we turn off thyristor using Gate?
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Answer :

No we cannot turn off normal thyristor using Gate.

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What is a phase control thyristor?

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What is the use of a thyristor in a circuit?

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asked Mar 19, 2018 by anonymous
What is a reverse conducting thyristor?
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What is a reverse conducting thyristor?

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What is the function of a thyristor?
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What is the function of a thyristor?

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asked Mar 19, 2018 by anonymous
Is a SCR a thyristor?
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Is a SCR a thyristor?

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

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asked Mar 6, 2018 by anonymous
Is thyristor a DC switch?
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Answer :

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

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asked May 3, 2020 by anonymous
Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.
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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.

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asked May 8, 2018 by anonymous
Thyristor can be protected from over voltages by using
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Thyristor can be protected from over voltages by using

Answer :

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

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asked May 8, 2018 by anonymous
Leakage current flows through the thyristor in
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Leakage current flows through the thyristor in

Answer :

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

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asked Mar 19, 2018 by anonymous
Why thyristor are not preferred for inverter?
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Why thyristor are not preferred for inverter?

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What is thyristor family?
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What is thyristor family?

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What is meant by firing angle of thyristor?
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What is meant by firing angle of thyristor?

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

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asked Mar 19, 2018 by anonymous
Why SCR is called as thyristor?
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Why SCR is called as thyristor?

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What is the application of thyristor?

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asked Feb 19, 2018 by anonymous
Explain thyristor gate drive circuit.
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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.

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asked Dec 7, 2017 by anonymous
parallel operation of mosfet can be done more easily as compared to thyristor. why?
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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.

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asked Dec 6, 2017 by anonymous
what are the disadvantages of thyristor?
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what are the disadvantages of thyristor?

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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

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asked Nov 15, 2017 by anonymous
write short notes on thyristor CSI .
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write short notes on thyristor CSI .

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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.

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asked Sep 21, 2017 by anonymous
thyristor have how many terminals?
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Answer :

Thyristor have three terminals anode, cathode and Gate.

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asked Sep 10, 2017 by anonymous
thyristor can be turned off by?
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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.

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asked Sep 10, 2017 by anonymous
what is thyristor commutation?
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Answer :

Thyristor commutation means turning off thyristor.

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asked Sep 10, 2017 by anonymous
why thyristor is called semi controlled device?
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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.

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asked Sep 10, 2017 by anonymous
why thyristor is called latching device?
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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.

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Thyristor Switched Capacitor (TSC)

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

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Yes DIAC can conduct in both direction.

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Thyristor controlled phase angle regulator

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Thyristor controlled phase angle regulator

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what is TCSC?
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what is TCSC?

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Thyristor Controlled Series Capacitor (TCSC)

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When the SCR conducts, the forward voltage drop will (a) 0.7 V at all load current (b) 2 to 2.5 V at all load...
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When the SCR conducts, the forward voltage drop will   (a) 0.7 V at all load current (b) 2 to 2.5 V at all load current (c) increases slightly with load current (d) remains constant with load current 

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asked Apr 9, 2018 by anonymous
In the snubber circuit used in a thyristor to limit the peak voltage overshoot applied across it damping...
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In the snubber circuit used in a thyristor to limit the peak voltage overshoot applied across it damping ratio is taken as about  A) 0.14 B) 0.21 C) 0.36 D) 0.62

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A thyristor (SCR) turns off when the
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

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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

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A thyristor power converter is said to be in discontinuous when:...
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A thyristor power converter is said to be in discontinuous when:  (A) The load current is zero even though the load voltage is present. (B) Both load voltage and load current are zero simultaneously. (C) The load current is present even though load voltage is zero. (D) When load current is ripple free. 

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The principal of a school conducts an interview session of teachers and students with a view to explore the possibility of their enhanced participation in school programmers. This endeavor may be related to which type of research? (A) Evaluation Research (B) Fundamental Research (C) Action Research (D) Applied Research

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(C) Action Research

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If a researcher conducts a research on finding out which administrative style contributes more to institutional effectiveness? This will be an example of (A) Basic Research (B) Action Research (C) Applied Research (D) None of the above
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If a researcher conducts a research on finding out which administrative style contributes more to institutional effectiveness? This will be an example of (A) Basic Research (B) Action Research (C) Applied Research (D) None of the above

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(B) Action Research

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In a plant, the xylem tissue conducts : (1) water (2) food (3) water and food (4) None of these
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In a plant, the xylem tissue conducts : (1) water (2) food (3) water and food (4) None of these 

Answer :

water

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The substance which conducts current in the solid state is (1) diamond (2) graphite (3) iodine (4) sodium chloride
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The substance which conducts current in the solid state is (1) diamond (2) graphite (3) iodine (4) sodium chloride

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graphite

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When electromagnetic waves are propagated in a waveguide  a) They travel along the walls of the waveguide b) They travel through the dielectric without touching the walls c) They are reflected from the walls but do not travel along the walls d) None of these

Answer :

When electromagnetic waves are propagated in a waveguide They travel through the dielectric without touching the walls

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The threshold effect in demodulators is a The rapid fall of output SNR when the input SNR falls below
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The threshold effect in demodulators is a) The rapid fall of output SNR when the input SNR falls below a particular value b) Exhibited by all the demodulators when the input SNR is low c) Exhibited by all AM suppressed carrier coherent demodulators d) Exhibited by correlation receivers

Answer :

The threshold effect in demodulators is The rapid fall of output SNR when the input SNR falls below a particular value

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Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:
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Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:  (1) 1 (2) 0.5 (3) 0.75 (4) 0.33

Answer :

Ripple in output current of step down Chopper feeding a RLE load is maximum, when duty cycle is equal to 0.5

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In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR
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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

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

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asked Apr 9, 2018 by anonymous
When the temperature of a doped semiconductor is increased, its conductivity...
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When the temperature of a doped semiconductor is increased, its conductivity  (1) Decreases (2) Increases (3) Does not change (4) Increases or decreases depending on whether it is p-type or n-type

Answer :

When the temperature of a doped semiconductor is increased, its conductivity Increases.

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asked Apr 9, 2018 by anonymous
Filters with the ___ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate...
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Filters with the ___ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole:  (1) Butterworth (2) Chebyshev (3) Bessel (4) Elliptical 

Answer :

Filters with the Chebyshev characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole.

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When a sinusoidal voltage wave drives a Schmitt Trigger, the output is a:  A) Triangular wave B) Rectified sine wave C) Rectangular wave D) Trapezoidal wave

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