What is a phase control thyristor?

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asked Mar 19, 2018 by anonymous

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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 Aug 9, 2017 by anonymous

speed control methods of three phase induction motor?

Last answer: Speed control of three phase induction motor

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asked Mar 19, 2018 by anonymous

What is the use of a thyristor in a circuit?

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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 thyristor family?

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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 Mar 19, 2018 by anonymous

What is the application of thyristor?

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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 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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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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asked Mar 19, 2018 by anonymous

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?

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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asked Mar 19, 2018 by anonymous

Why SCR is called as thyristor?

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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

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

Why thyristor are not preferred for inverter?

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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 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 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 May 1, 2018 by anonymous

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above

Last answer: The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases

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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 Sep 10, 2017 by anonymous

what is thyristor commutation?

Last answer: Thyristor commutation means turning off thyristor.

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asked Oct 13, 2019 by anonymous

Speed control of the motor using TRIAC

Last answer: Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.

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asked Mar 11, 2018 by anonymous

Explain series switching control of AC load.

Explain series switching control of AC load. Single phase resistance load - Integral half cycle control Phase control - Resistance load

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Explain the pulse width modulation technique for control of AC output voltage.

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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 Mar 10, 2018 by anonymous

What is the difference between a line voltage and low voltage control system?

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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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942 views 1 answer

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 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 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 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

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.

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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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What is the automatic control system?

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What is HT and LT control panels?

Last answer: HT Panel is like LT Panel except that it is used for high tension cables. LT Panels :LT Panel is an electrical distribution board that receives power from generator or transformer and distributes the same to various electronic devices and distribution boards.

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asked Jul 4, 2019 by anonymous

What are the disadvantages of Open loop control system?

Last answer: Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

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asked Mar 10, 2018 by anonymous

What are the electromagnetic waves used in remote control?

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What are the advantages of open loop control system?

Last answer: Open loop control system are simple to design. Open loop control system are generally stable.

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asked Mar 10, 2018 by anonymous

What are the different types of control systems?

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asked Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

Last answer: Field control of DC motor Armature control of DC motor

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asked Jul 25, 2019 by anonymous

Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.

Last answer: Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.

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asked Apr 28, 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

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asked Mar 11, 2018 by anonymous

Describe the gate circuit for a single phase full converter.

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asked Apr 30, 2018 by anonymous

Oscillator independent of phase shift is

Oscillator independent of phase shift is (1) Relaxation (2) Wein bridge (3) Clapp (4) All of these

Last answer: Oscillator independent of phase shift is Relaxation

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asked Apr 30, 2018 by anonymous

A differentiator is not usually used in control system, because it : -

A differentiator is not usually used in control system, because it : - (A) reduces damping (B) increases error (C) reduces gain margin (D) increases input noise

Last answer: A differentiator is not usually used in control system, because it : - increases input noise

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58 views 1 answer

asked Apr 28, 2018 by anonymous

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1

Last answer: A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system crosses the real axis at -0.1.

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What is a phase control thyristor?

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