thyristor can be turned off by?

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asked Sep 10, 2017 by anonymous

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asked 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

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asked Jun 18, 2018 by anonymous

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

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asked Mar 6, 2018 by anonymous

SCR turned off when the anode current falls below?

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

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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).

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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

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asked May 8, 2018 by anonymous

Thyristor can be protected from over voltages by using

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

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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

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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.

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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.

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asked Mar 20, 2018 by anonymous

The fuse blows off by?

Last answer: The fuse blows off by melting.

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asked Mar 19, 2018 by anonymous

What is meant by pinch off voltage in MOSFET?

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asked Sep 5, 2018 by anonymous

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.

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asked Mar 19, 2018 by anonymous

What is meant by firing angle of thyristor?

Last answer: The point at which SCR is triggered is known as firings angle of 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.

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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.

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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.

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asked Apr 11, 2018 by anonymous

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.

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asked Sep 10, 2017 by anonymous

what is thyristor commutation?

Last answer: Thyristor commutation means turning off thyristor.

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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.

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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.

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608 views 1 answer

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.

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.

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asked May 8, 2018 by anonymous

Leakage current flows through the thyristor in

Last 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

What is a phase control thyristor?

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asked Mar 19, 2018 by anonymous

Why thyristor are not preferred for inverter?

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asked Mar 19, 2018 by anonymous

What is thyristor family?

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asked Mar 19, 2018 by anonymous

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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asked Mar 19, 2018 by anonymous

What is the function of a thyristor?

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asked Mar 19, 2018 by anonymous

Why SCR is called as thyristor?

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asked Mar 19, 2018 by anonymous

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.

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143 views 1 answer

asked Mar 19, 2018 by anonymous

How is a thyristor used to convert AC to DC?

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asked Mar 19, 2018 by anonymous

What is the application of thyristor?

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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

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134 views 2 answers

asked Feb 19, 2018 by anonymous

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.

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asked Dec 6, 2017 by anonymous

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

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764 views 2 answers

asked Nov 15, 2017 by anonymous

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.

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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.

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asked Aug 9, 2017 by anonymous

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.

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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

Last answer: C 12/36 + x/45 = 1 (12*5)/180+4x/180=1 60+4x=180 4x=120 X=120/4=30min

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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)

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.

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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

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

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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

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asked Aug 8, 2017 by anonymous

what is TCSC?

Last answer: Thyristor Controlled Series Capacitor (TCSC)

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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 ?

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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asked 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)

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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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anonymous · Answer 1 · 2017-09-21T14:02:15+0000

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

thyristor can be turned off by?

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