Is a SCR a thyristor?

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Is a SCR a thyristor?

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asked Mar 19, 2018 by anonymous

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Why SCR is called as thyristor?

97 views 0 answers

asked Mar 19, 2018 by anonymous

Explain triggering of SCR using opto-coupler. State its advantages.

Explain triggering of SCR using opto-coupler. State its advantages.
Last Answer : Triggering of SCR using opto-coupler: A simple opto-coupler based triggering circuit for SCR is shown in the figure. An optocoupler or opto-isolator is a combination of light source ... is small size and light weight device. iii)Interfacing with logic circuits is easily possible.

326 views 1 answer

asked May 21, 2020 by anonymous

Draw the circuit diagram of battery charger using SCR and explain it’s working.

Draw the circuit diagram of battery charger using SCR and explain it’s working.
Last Answer : Battery charger circuit using SCR: The figure shows the battery charger circuit using SCR. A 12V discharged battery is connected in the circuit and switch SW is closed. The singlephase 230V ... not fired. In this way, after full charging, further charging is automatically stopped.

535 views 1 answer

asked May 21, 2020 by anonymous

Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.

Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.
Last Answer : Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on.

220 views 1 answer

asked May 21, 2020 by anonymous

Explain working of AC circuit breaker using SCR with circuit diagram.

Explain working of AC circuit breaker using SCR with circuit diagram.
Last Answer : AC Circuit Breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

936 views 1 answer

asked Oct 13, 2019 by anonymous

Temperature controller using SCR

Temperature controller using SCR
Last Answer : Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.

412 views 1 answer

asked Oct 13, 2019 by anonymous

Compare SCR and TRIAC

Compare SCR and TRIAC
Last Answer : SCR TRIAC It is an unidirectional device. It is a bidirectional device. It is turned-on by only positive gate current. It can be turned-on by either ... applications including lamp dimmer, heating control, zero voltage switched AC relay, small AC motor control etc.

132 views 1 answer

asked Oct 13, 2019 by anonymous

Describe triggering of SCR using UJT relaxation oscillator.

Describe triggering of SCR using UJT relaxation oscillator.
Last Answer : I need it's operation

575 views 2 answers

asked Oct 13, 2019 by anonymous

How GTO is advantages over SCR

How GTO is advantages over SCR
Last Answer : i) It is turned-off by negative gate pulse. ii) No commutation circuit required, reducing the cost, size, weight and volume of the circuit. iii) As commutation choke is not used, the associated acoustic ... turn off time permits high switching frequency. v) It has higher di/dt rating at turn-off.

711 views 1 answer

asked Oct 13, 2019 by anonymous

Draw a neat labelling V-I characteristics of SCR and explain the region

Draw a neat labelling V-I characteristics of SCR and explain the region
Last Answer : (i) Latching current: It is the minimum anode current required to maintain the SCR in the conduction state just after turn-on and the gate signal has been removed. (ii) Holding current: It is the minimum anode current required to hold the conducting SCR in the ON state.

786 views 2 answers

asked Jul 25, 2019 by anonymous

Draw construction of SCR using two transistor model. Explain its operation.

Draw construction of SCR using two transistor model. Explain its operation.
Last Answer : Two Transistor Model of SCR or Thyristor

434 views 1 answer

asked Jul 25, 2019 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

185 views 0 answers

asked Jun 18, 2018 by anonymous

SCR is more utilized as compared to Triac because it is

SCR is more utilized as compared to Triac because it is
Last Answer : SCR is more utilized as compared to Triac because it is available with higher ratings

88 views 1 answer

asked Apr 29, 2018 by anonymous

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last Answer : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V

182 views 1 answer

asked Apr 28, 2018 by anonymous

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load,

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses
Last Answer : In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

177 views 1 answer

asked Apr 28, 2018 by anonymous

An SCR without any external connections is considered as

An SCR without any external connections is considered as (A) two diodes in series (B) three diodes in series (C) two n-p-n transistors in series (D) two p-n-p transistors in series
Last Answer : An SCR without any external connections is considered as three diodes in series

103 views 1 answer

asked Apr 28, 2018 by anonymous

Is SCR unidirectional switch?

Last Answer : Yes, SCR is a unidirectional switch.

76 views 1 answer

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.

924 views 1 answer

asked Mar 6, 2018 by anonymous

What is holding current and latching current in SCR ?

What is holding current and latching current in SCR? Draw the gate characteristics of an SCR and explain the characteristics. What are the different signals which can be used for turning on SCR by gate control? compare them.
Last Answer : (i) Holding Current: Holding current is defined as the minimum anode current required to maintain conducting SCR in the on-state. (ii) Latching Current: Latching current is defined as the ... the on-state immediately after the SCR has been turned on and the gate signal has been removed.

1.5k views 2 answers

asked Feb 3, 2018 by anonymous

What is the use of SCR?

What is the use of SCR?
Last Answer : SCR are use in lamp dimming, power regulators, motor control, rectifications of high power AC, control of welding machines and also use as switch these are some uses of silicon controlled rectifier.

91 views 1 answer

asked Dec 9, 2017 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

106 views 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.

211 views 1 answer

asked May 8, 2018 by anonymous

What is a phase control thyristor?

153 views 0 answers

asked Mar 19, 2018 by anonymous

Why thyristor are not preferred for inverter?

454 views 0 answers

asked Mar 19, 2018 by anonymous

What is thyristor family?

67 views 0 answers

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.

230 views 1 answer

asked Mar 19, 2018 by anonymous

What is the use of a thyristor in a circuit?

2.9k views 0 answers

asked Mar 19, 2018 by anonymous

What is a reverse conducting thyristor?

84 views 0 answers

asked Mar 19, 2018 by anonymous

What is the function of a thyristor?

92 views 0 answers

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?
Last Answer : thyristor

123 views 1 answer

asked Mar 19, 2018 by anonymous

What is the application of thyristor?

90 views 0 answers

asked Mar 19, 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

160 views 2 answers

asked Mar 6, 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.

3.0k views 1 answer

asked Feb 19, 2018 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.

300 views 1 answer

asked Dec 7, 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

886 views 2 answers

asked Dec 6, 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.

107 views 2 answers

asked Nov 15, 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).

1.7k views 1 answer

asked Aug 8, 2017 by anonymous

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.

4 views 0 answers

asked Apr 13, 2021 by Rubeni P Shaambeni

Purpose of Selective Catalytic Reduction (SCR)

Purpose of Selective Catalytic Reduction (SCR)
Last Answer : Purpose of Selective Catalytic Reduction (SCR) : 1. It reduces Nox 75% to 90% 2. Converts it in to molecular nitrogen and water vapor 3. It reduces HC emission up to 80% 4. It reduces PM emission 20 to 25%.

26 views 1 answer

asked Jan 2, 2021 by anonymous

An inductor is connected in series with SCR to protect it from

An inductor is connected in series with SCR to protect it from A) Excessive high voltage B) Excessive high dv/dt C) Excessive high di/dt D) Excessive large forward current
Last Answer : An inductor is connected in series with SCR to protect it from Excessive high di/dt

130 views 1 answer

asked Jun 18, 2018 by anonymous

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) ... proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α
Last Answer : The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

150 views 1 answer

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

170 views 1 answer

asked Apr 28, 2018 by anonymous

How do you test an SCR?

62 views 0 answers

asked Mar 15, 2018 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.

368 views 1 answer

asked May 3, 2020 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.

115 views 1 answer

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.

107 views 1 answer

asked Sep 21, 2017 by anonymous

can we turn off thyristor using Gate?

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

91 views 1 answer

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.

96 views 1 answer

asked Sep 21, 2017 by anonymous

thyristor have how many terminals?

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

58 views 1 answer

asked Sep 21, 2017 by anonymous

thyristor can be turned off by?

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

133 views 1 answer

asked Sep 10, 2017 by anonymous

anonymous · Answer 1 · 2018-06-25T04:19:20+0000

Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.

Is a SCR a thyristor?

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