# explain blanking times for Bridge circuit?

explain blanking times for Bridge circuit?

Blanking time is provided by driver circuit to power switch. Blanking time is important because the turn on input of one transistor must be delayed with turn off input of another transistor if both the transistors are connected in one converter leg. This blanking time helps in avoiding cross conduction.

## Related questions

Description : Draw circuit diagram of symmetrical configuration of bridge converter.

Answer : circuit diagram of symmetrical configuration of bridge converter

Description : A dummy strain gage is used in a quarter bridge strain gage circuit to :  (A) compensate for changes in temperature and lead wire resistance  (B) produce more output voltage from the bridge  (C) increase the sensitivity of the bridge  (D) compensate lead wire resistance only

Answer : A dummy strain gage is used in a quarter bridge strain gage circuit to : compensate for changes in temperature and lead wire resistance

Description : Explain three phase bridge inverter.

Answer : Three phase bridge inverter: Three phase bridge inverter converts DC voltage input to three-phase variable frequency variable voltage output. DC voltage source can be a DC source or output of the rectifier. ... in proper sequence. The switch may be thyristor or IGBT etc.

Description : Explain the operation of full bridge converters with their different operating modes. State its advantages and disadvantages.

Answer : Full bridge converter: Full bridge converter provides isolation between input and output. Full bridge converter is used for step up or step down the input voltage. Full bridge converter consists of four power semiconductor ... Require filter on both input and output.

Description : Draw full bridge & half bridge configuration with common cathode.

Answer : Half Bridge Configuration: Full Bridge Configuration:

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.

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

Description : 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

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

Description : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.

Answer : The bridge most suited for accurate measurement of relative permittivity of dielectric materials is Schering Bridge.

Description : The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

Answer : The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge

Description : The bridge most suited for measurement of a four-terminal resistance in the range of 0.001 Ohm to 0.1 Ohm (A) Wien’s bridge (B) Kelvin double bridge (C) Maxwell’s bridge (D) Shering Bridge

Answer : The bridge most suited for measurement of a four-terminal resistance in the range of 0.001 Ohm to 0.1 Ohm (A) Wien’s bridge (B) Kelvin double bridge (C) Maxwell’s bridge (D) Shering Bridge

Answer : For measurements on high voltage capacitors, the suitable bridge is Schering bridge.

Answer : Advantages :  1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded.  2. The need of center-tapped transformer is eliminated.  ... The value of the diodes used should be precise , else there will be an error in rectification

Description :  operation of whetstone bridge.

Answer : A Wheatstone bridge is widely used to measure the electrical resistance. This circuit is built with two known resistors, one unknown resistor and one variable resistor connected in the form of bridge. ... using a Wheatstone Bridge the unknown electrical resistance value can easily measure.

Description : tern null as it applies to bridge measurement.

Answer : Null measurements balance voltages so that there is no current flowing through the measuring device and, therefore, no alteration of the circuit being measured. Null measurements are generally more ... the use of standard voltmeters and ammeters, and they still have limits to their precision.

Description : Wheatstone bridge

Description : Which of the following is true with respect to Wien Bridge? A) It does not require equal values of R or C  B) It requires that R and C values of all components must be equal C) It requires that all resistors should have equal values D) None of these

Answer : Which of the following is true with respect to Wien Bridge? A) It does not require equal values of R or C  B) It requires that R and C values of all components must be equal C) It requires that all resistors should have equal values D) None of these

Description : 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

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

Answer : If an inductance is connected in one arm of bridge and resistances in the remaining three arms the bridge cannot be balanced.

Answer : In a Schering bridge the potential of the detector above earth potential is a few volts only.

Answer : In an Anderson bridge, the unknown inductance is measured in terms of known capacitance and resistance.

Description : A universal RLC bridge uses?

Answer : A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.

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

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.

Description : Explain working of static AC circuit breaker.

Answer : Static 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 ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

Description : With neat diagram explain synchronized UJT triggering circuit.

Answer : Line Synchronized UJT triggering circuit: The UJT is almost ideal as a firing device for SCRs. There are 2 main reasons for the compatibility between UJTs and SCRs. Firstly, the UJT produces a ... , the SCR is sure to have the right polarity between the anode and cathode for turning on.

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

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.

Description : Explain MOSFET gate drive circuit and totem pole configuration.

Answer : MOSFET gate drive circuit: The turning on and turning off of MOSFET can be controlled from gate to source voltage signal. If the gate to source voltage of MOSFET exceeds threshold ... this configuration, the two switches (transistors) are used in totem pole arrangement with a comparator.

Description : Explain open emitter BJT drive circuit.

Answer : open emitter BJT drive circuit:

Description : Explain DC coupled drive circuit with unipolar output.

Answer : DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms

Description : 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.

Description : Describe the gate circuit for a single phase full converter.

Description : Describe triggering circuit for TRIAC using DIAC.

Answer : Triggering circuit for TRIAC using DIAC: DIAC stands for diode alternating current. It's a two terminal four layer bidirectional device. It conducts in both directions. DIAC is used for triggering TRIAC. ... of DIAC to the gate terminal of TRIAC reduces the harmonics.

Description : Draw circuit diagram of Class B commutation.

Answer : Class B: Resonant Pulse Commutation:

Description : Which circuit is used as amplitude comparator?

Answer : Schmitt trigger circuit is used as amplitude comparator.

Description : What is the use of a thyristor in a circuit?

Description : basic gate drive circuit of GTO

Answer : basic gate drive circuit of GTO

Description : State and explain Ohm's law for magnetic circuit.

Answer : Ohm's law for electric circuit is V = I R where V is voltage, I is current, R is Resistance. Ohm's law for magnetic circuit is MMF = Φ X S where MMF is magnetomotive force (NI) ... . Resistance is the opposition to the flow of current while reluctance is the opposition to the flow of magnetic flux.

Description : Briefly explain how the power factor of an inductive circuit can be improved.

Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.

Description : Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

Description : Explain why potential difference is necessary to produce current in a circuit.

Description : Draw the circuit diagram of crystal oscillator and explain its working.

Answer : To excite a crystal for operation in the series-resonant mode it may be connected as a series element in a feedback path, the crystal impedance is the smallest and the amount of positive feedback is the largest. ... which is good.  The resonant frequency is given as  Fo = 1/( 2 π √LC )

Description : Draw and explain Hartley Oscillator circuit diagram.

Answer : Function of each component: 1. An NPN transistor connected in a common emitter configuration works as the active device in amplifier stage and CE configuration provides 180°phase shift. 2. R1 and R2 ... circuit to the base-emitter circuit.  The frequency of oscillation is given as-

Description : Explain power relations in three phase circuit.

Description : Explain power in single phase AC circuit.

Description : The loop equation for a series RLC circuit gives

Answer : The loop equation for a series RLC circuit gives

Description : State Ohm’s law for electric circuit.

Answer : Ohms law -States that the current flows in a circuit is directly proportional to the applied voltage (V) and inversely the proportional resistance provided with the temperature main constant

Description : Time constant for RC circuit formula τ = RC Where, τ = time constant

Answer : Time constant for RC circuit formula τ = RC Where, τ = time constant

Description : State maximum power transfer theorem for DC circuit.

Answer : Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.

Description : Define- (i) Node (ii) Loop for a DC circuit

Answer : Ans: i) Node: A point or junction at which two or more elements of network are connected is called as node. ii) Loop: A closed path for flow of current in an electrical circuit is called loop.

Description : For a DC circuit capacitor is

Answer : For a DC circuit capacitor is virtually an open circuit

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