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.
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.
asked
Sep 10, 2017
by
anonymous
Description : Series and parallel capacitor problem
Answer :
Series and parallel capacitor problem 1 : https://youtu.be/MSl5mRwtjAE Series and parallel capacitor problem 2 : https://youtu.be/yGwbpyEtIyw Series and parallel capacitor problem 3 : https:// ... https://youtu.be/_7KwEwWqiNU Series and parallel capacitor problem 10 : https://youtu.be/et8MCWV_OyE
asked
May 21, 2019
by
anonymous
Answer :
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.
asked
Mar 20, 2018
by
anonymous
Description : What is the purpose of a capacitor in an AC circuit?
Answer :
Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor
asked
Dec 16, 2017
by
anonymous
Description : How does a capacitor improve power factor?
Answer :
Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.
asked
Dec 16, 2017
by
anonymous
Description : What is a phase control thyristor?
asked
Mar 19, 2018
by
anonymous
Description : What is thyristor family?
asked
Mar 19, 2018
by
anonymous
Description : What is meant by firing angle of thyristor?
Answer :
The point at which SCR is triggered is known as firings angle of thyristor.
asked
Mar 19, 2018
by
anonymous
Description : What is the use of a thyristor in a circuit?
asked
Mar 19, 2018
by
anonymous
Description : What is a reverse conducting thyristor?
asked
Mar 19, 2018
by
anonymous
Description : What is the function of a thyristor?
asked
Mar 19, 2018
by
anonymous
Description : What is the application of thyristor?
asked
Mar 19, 2018
by
anonymous
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
asked
Dec 6, 2017
by
anonymous
Answer :
By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.
asked
Sep 21, 2017
by
anonymous
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.
asked
Sep 21, 2017
by
anonymous
Answer :
Thyristor commutation means turning off thyristor.
asked
Sep 10, 2017
by
anonymous
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 : State classification of Phase controlled rectifiers.
Answer :
Classification of phase controlled rectifiers:
asked
May 21, 2020
by
anonymous
Description : Application one lamp controlled from two places
Answer :
Application one lamp controlled from two places: 1. For Stair case wiring 2. Hospital Wiring ( For operating the lamp in room and nursing station) 3. Bedroom Lighting.
asked
May 7, 2020
by
anonymous
Description : Single-phase mid-point controlled rectifier with RL load
Answer :
Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.
asked
Oct 13, 2019
by
anonymous
Description : Single-phase Midpoint controlled rectifier with Resistive load
Answer :
Single-phase Midpoint controlled rectifier with Resistive load: 1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.
asked
Oct 13, 2019
by
anonymous
Description : Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
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.
asked
Jul 25, 2019
by
anonymous
Description : Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.
Answer :
Single phase fully controlled half wave converter: The circuit diagram of single-phase half-wave controlled rectifier with RL load and without freewheeling diode is shown in Fig. (a). The SCR T is ... , when again pulse is applied, the SCR is turned on & the above cycle is repeated.
asked
Jul 25, 2019
by
anonymous
Description : How are nuclear reactors controlled? Explain two different methods in brief.
Answer :
Nuclear reactor is controlled using control rods: Control rods are made up of very high neutron absorbing material like boron, cadmium. By adjusting height of control rods on reactor core ... of nuclear reaction will increase. Whereas by pushing control rod towards the core it will reduce.
asked
Sep 8, 2018
by
anonymous
Description : 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
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
asked
May 1, 2018
by
anonymous
Description : A current controlled voltage source is equivalent to : (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier
Answer :
A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier
asked
Apr 30, 2018
by
anonymous
Description : A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is
Answer :
A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is 150/√3
asked
Apr 29, 2018
by
anonymous
Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is
Answer :
When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2
asked
Apr 29, 2018
by
anonymous
Description : 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
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
asked
Apr 28, 2018
by
anonymous
Description : In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals
Answer :
In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage
asked
Apr 28, 2018
by
anonymous
Description : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
Answer :
For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25
asked
Apr 27, 2018
by
anonymous
Answer :
The speed of a locomotive is controlled by gear box.
asked
Mar 22, 2018
by
anonymous
Answer :
The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.
asked
Mar 21, 2018
by
anonymous
Description : How many servos can be controlled by Arduino?
Answer :
MOSFET are voltage controlled devices.
asked
Sep 23, 2017
by
anonymous
Answer :
BJT is current controlled device.
asked
Sep 23, 2017
by
anonymous
Answer :
No, IGBT is not the current controlled device. IGBT is a voltage controlled device. IGBT have combine qualities of MOSFET and BJT. The high switching speed of MOSFET and low conduction losses of BJT. Also, IGBT which stands for Insulated Gate Bipolar Transistor have high input impedance.
asked
Sep 13, 2017
by
anonymous
Answer :
In BJT there is movement of electrons and holes accros the junctions which is basicaly current flow.
asked
Sep 10, 2017
by
anonymous
Answer :
No, BJT is a current controlled device .
asked
Sep 10, 2017
by
anonymous
Answer :
already answered here is mosfet current controlled device?
asked
Sep 10, 2017
by
anonymous
Description : Chopper controlled DC motor
Answer :
Chopper controlled DC motor
Description : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems to step up high voltage signals and provide extra high voltage C) It is a transformer used in power systems to step down extra high voltage signals and provide low voltage D) None of these
Answer :
What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these
asked
Apr 29, 2018
by
anonymous
Description : What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero
Answer :
What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero
asked
Apr 29, 2018
by
anonymous
Description : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
Answer :
What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
asked
Apr 29, 2018
by
anonymous
Description : What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these
Answer :
What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these
asked
Apr 29, 2018
by
anonymous
Description : What are the characteristics of a capacitor?
asked
Mar 15, 2018
by
anonymous
Description : What is the role of a capacitor in a circuit?
asked
Mar 15, 2018
by
anonymous
Description : What is the basic use of capacitor?
asked
Mar 15, 2018
by
anonymous
Description : What is the basic function of a capacitor?
asked
Mar 15, 2018
by
anonymous
