In a single-phase full converter, the number of SCRs conducting during overlap is 

 (a) 1 (b) 2 (c) 3 (d) 4 

2 Answers

Answer :

In a single-phase full converter, the number of SCRs conducting during overlap is 

Answer :

4

Related questions

Description : A single phase full-wave half-controlled bridge converter feeds an inductive load. The two SCRs in the converter are connected to a common DC bus. The converter has to have a freewheeling diode.  (A) ... to one of the SCRs is missed, it will subsequently cause a high load current in the other SCR.

Last Answer : A single phase full-wave half-controlled bridge converter feeds an inductive load. The two SCRs in the converter are connected to a common DC bus. The converter has to have a freewheeling diode. because the converter does not provide for free-wheeling for high values of triggering angles

Description : Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it. 

Last Answer : Circuit Diagram: Waveforms:

Description : 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.

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

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

Description : single phase full converter

Last Answer : single phase full converter

Description : What is the turn-off time for converter grade SCRs and inverter grade SCRs?

Last Answer : Turn-off time for converter grade SCRs is 50 – 100 ms turn-off time for converter grade SCRs and inverter grade SCRs and for inverter grade SCRs is 3 – 50 ms.

Description : A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current, if the triggering angle is 30o, the input power factor will be  (A) 0.65 (B) 0.78 (C) 0.85 (D) 0.866

Last Answer : A single phase fully controlled bridge converter supplies a load drawing constant and ripple free load current, if the triggering angle is 30o, the input power factor will be 0.78

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

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

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

Last Answer : Please show the solution for this question

Description : Why the power factor of semiconverter is better than full converter?

Last Answer : Power factor of semiconverter is better than full converter

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

Last 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 : A separately excited d.c. motor fed from single phase full converter with firing angle 60° runs at 1000 r.p.m. If motor is connected to single phase semiconverter with the same firing angle of 60°, it would run at (a) 2000 rpm (b) 1850 rpm (c) 1500 rpm (d) 1000 rpm 

Last Answer : Ans =1500

Description : a single phase full wave midpoint thyristor converter uses a 230/200V transformer with centre tap on the secondary side. The P.I.V per thyristor is   (A) 100V (B)141.4V (C)200V (D)282.8V

Last Answer : d

Description : An SCR starts conducting with appreciable current when

Last Answer : An SCR starts conducting with appreciable current when anode and gate both are positive

Description : In a three phase controlled bridge rectifier with an increase of overlap angles the output dc voltage

Last Answer : In a three phase controlled bridge rectifier with an increase of overlap angles the output dc voltage decreases

Description : A triac thyristor functions as a control device and is basically ________________. A. two NPN transistors in parallel with a common base lead B. a diode in series with a temperature sensitive capacitor C. two ... -back SCR's with a common gate lead D. a triode tube with an extra heavy grid element

Last Answer : Answer: C

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

Last Answer : circuit diagram of symmetrical configuration of bridge converter

Description : Give the effect of source impedance on converter operation.

Last Answer : Effect of source impedance on converter operation: For single-phase fully controlled bridge converter, the SCRs are triggered in pairs alternately. During positive half-cycle of input, SCRs T1 and T2 are triggered ... increases and as a consequence, the output dc voltage decreases. 

Description : Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.

Last 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. 

Description : The percent resolution of an 8 -bit D/A converter is

Last Answer : The percent resolution of an 8 -bit D/A converter is 0.392

Description : To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires :  (A) 12 SCRs (B) 18 SCRs (C) 36 SCRs (D) 72 SCRs

Last Answer : To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : 36 SCRs

Description : Explain buck or step down converter and draw its waveforms.

Last Answer : Buck converter or Step down converter: Buck converter is a step-down converter. The buck converter step-down the output voltage and step up the output current. Buck converter is a DC to DC converter. ... load. The output voltage is controlled by controlling on period and off period.

Description : Explain flyback converter and draw its waveforms.

Last Answer : Flyback converter: A flyback converter is used for getting DC output and for isolating input mains and output voltage. A flyback converter is like a buck-boost converter with input and output isolated. There ... during the off time transformer transfer the energy to load.

Description : Explain buck boost converter and draw its waveforms.

Last Answer : Buck-Boost converter: The buck-boost converter consists of a transistor for switching purpose, diode, inductor, and capacitor. Buck-boost converter is the combination of the buck converter and boost ... In buck-boost converter both input current and diode current are discontinuous.

Description : what is Cuk converter and draw its waveforms.

Last Answer : Cuk converter: Cuk converter is the series combination of boost and the buck converter. The Cuk converter is the DC to DC converter whose output voltage is greater than or less the than the input ... controlling the switch duty cycle the output voltage can be controlled.

Description : What are the advantages of single phase bridge converter over single phase mid-point converter?

Last Answer : a. SCRs are subjected to a peak-inverse voltage of 2Vm in a fully controlled bridge rectifier. Hence for same voltage and currnt ratings of SCrs, power handled by mid-point configuration is about ... load power. As such, the transformer rating in mid-point converter is double the load rating.

Description : A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is  (A) 0.78 (B) 0.827 (C) 0.866 (D) 0.9

Last Answer : A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25o and an overlap angle of 10o with constant dc output current of 20 A. The fundamental power factor (displacement factor) at input ac mains is 0.78

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

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

Description : Single-phase mid-point controlled rectifier with RL load

Last 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.

Description : Single-phase Midpoint controlled rectifier with Resistive load

Last 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.

Description : A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be

Last Answer : A single-phase voltage source square -wave inverter feeds pure inductive load. The waveform of the load current will be triangular

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

Last 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

Description : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

Last Answer : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that the transformers should belong to the same vector group

Description : three phase to single phase cycloconverter

Last Answer : three phase to single phase cycloconverter

Description : 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

Description : Explain three phase full wave controller.

Last Answer : Three phase full wave controller: Three phase full wave controller is also called as the three-phase bidirectional controller. Let the load is star connected so at each phase there are antiparallel connected SCRs. ... conduct at the same time and the third phase will be open.

Description : The removal of paint from electrical equipment, such as generators, should be cautiously undertaken because ____________. A. the mechanical shock of paint removal lessens the dielectric strength ... phase windings frequently become isolated from each other due to dust interference at the terminals

Last Answer : Answer: B

Description : With the help of neat diagram, describe the procedure to carry out phasing out test on a 3 phase transformer. Also state the purpose of conducting this test on 3 phase transformer.

Last Answer : i) This test is carried out on 3-ph transformer to identify primary & secondary winding belonging to the same phase. ii) As shown in fig above all primary & secondary phases ... of this test is to check the respective phases of primary & secondary windings in 3-ph transformer

Description : State what is the significance of conducting phasing out test on a 3-phase transformer? Explain its procedure with a suitable connection diagram.

Last Answer : -Short primary & secondary winding of other phases expect the one under test. -Connect voltmeter to secondary winding. -A small DC current is circulated through the primary winding through ... . -The test repeated for finding out remaining concerned secondary windings in the same manner.

Description : What is a good video editing program that can overlap videos?

Last Answer : Don’t know if it can help you, but take a look at http://www.virtualdub.org/

Description : Consider the following three statements. A) Social divisions take place when social differences overlap. -SST 10th

Last Answer : B - As we know that, the social division takes place when social differences overlap and it is also possible that a person can have multiple identities. But, it is not correct that social divisions ... Therefore, statements A and B are correct whereas C is incorrect. Hence, option (b) is correct

Description : “Social division takes place when some social differences overlap with other differences.” -SST 10th

Last Answer : (i) The difference between the Blacks and Whites becomes a social division in the US because the Blacks tend to be poor, homeless and discriminated against. (ii) In our country ... social difference becomes more important when other people start feeling that they belong to different communities.

Description : If several food chains overlap, this can best be described as?

Last Answer : food web

Description : Area where two ecosystem overlap each other:

Last Answer : Area where two ecosystem overlap each other: A. Ecotone B. Niche C. Edge effect D. Ecotypes

Description : Hyperconjugation involves overlap of which of the following orbitals?

Last Answer : Hyperconjugation involves overlap of which of the following orbitals? A. `sigma-sigma` B. `sigma-p` C. `p-p` D. `pi-pi`

Description : When lines overlap in a system of equations?

Last Answer : Then they are simultaneous equations.

Description : What is it called when the crests of two waves overlap and result in increased wave amplitude?

Last Answer : kkkk