In which type of AC to DC converter efficiency is higher :

In which type of AC to DC converter efficiency is higher :
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Answer :

In which type of AC to DC converter efficiency is higher : solid state rectifier

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A single-phase fully controlled thyristor bridge ac-dc converter is operating at a firing angle of 25 and an

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

A 3-phase fully controlled bridge converter with free wheeling diode is fed from 400 V, 50 Hz AC source and

Description : A 3-phase fully controlled bridge converter with free wheeling diode is fed from 400 V, 50 Hz AC source and is operating at a firing angle of 60o. The load current is assumed constant at 10 A due to high load inductance. The input ... 0.552 (C) IDF IPF = = 0.5; 0.478 (D) IDF IPF = = 0.5; 0.318 

Last Answer : A 3-phase fully controlled bridge converter with free wheeling diode is fed from 400 V, 50 Hz AC source and is operating at a firing angle of 60o. The load current is assumed constant at 10 A due to high ... (IDF) and the input power factor (IPF) of the converter will be IDF IPF = = 0.5; 0.478

A three-phase, 440 V, 50 Hz ac mains fed thyristor bridge is feeding a 440 V dc, 15 kW, 1500 rpm separately

Description : A three-phase, 440 V, 50 Hz ac mains fed thyristor bridge is feeding a 440 V dc, 15 kW, 1500 rpm separately excited dc motor with a ripple free continuous current in the dc link under all operating conditions, Neglecting the ... at half the rated speed is  (A) 0.354 (B) 0.372 (C) 0.90 (D) 0.955

Last Answer : A three-phase, 440 V, 50 Hz ac mains fed thyristor bridge is feeding a 440 V dc, 15 kW, 1500 rpm separately excited dc motor with a ripple free continuous current in the dc link under all operating conditions, Neglecting the losses, the power factor of the ac mains at half the rated speed is 0.354

A freewheeling diode in a phase controlled converter

Description : A freewheeling diode in a phase controlled converter  A) Deceases the possibility of discontinuous conduction in the load B) Increases the possibility of discontinuous conduction in the load C) Reduces the power factor and causes over voltages D) Causes over voltages

Last Answer : A freewheeling diode in a phase controlled converter Deceases the possibility of discontinuous conduction in the load 

The ripple content of load current of a converter feeding RL load is decided by

Description : The ripple content of load current of a converter feeding RL load is decided by  A) Load resistance alone B) Load inductance alone C) Both load resistance and load inductance D) Neither resistance nor inductance

Last Answer : The ripple content of load current of a converter feeding RL load is decided by Both load resistance and load inductance

A single phase full-wave half-controlled bridge converter feeds an inductive load. The two SCRs in the

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

A three-phase, fully controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW

Description : A three-phase, fully controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW power 420 V dc to a three-phase, 415 V(line), 50 Hz ac mains. Consider dc link current to be constant. The rms current of the thyristor is  (A) 119.05 A (B) 79.37 A (C) 68.73 A (D) 39.68 A

Last Answer : A three-phase, fully controlled thyristor bridge converter is used as line commutated inverter to feed 50 kW power 420 V dc to a three-phase, 415 V(line), 50 Hz ac mains. Consider dc link current to be constant. The rms current of the thyristor is 68.73 A

A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load

Description : A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 10 A at a firing angle of 30o. The approximate Total harmonic Distortion (%THD) and the rms value of fundamental component ... (B) 31% and 7.8 A (C) 66% and 6.8 A (D) 66% and 7.8 A

Last Answer : A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 10 A at a firing angle of 30o. The approximate Total harmonic Distortion (%THD) and the rms value of fundamental component of input current will respectively be 31% and 7.8 A

a single phase full wave midpoint thyristor converter uses a 230/200V transformer with centre tap on the

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

A converter which can operate in both 3 pulse and 6 pulse mode is a

Description : A converter which can operate in both 3 pulse and 6 pulse mode is a  (A) 1 phase full converter (B) 3 phase half wave converter (C) 3 phase semi converter (D) 3 phase full converter.

Last Answer : A converter which can operate in both 3 pulse and 6 pulse mode is a 3 phase semi converter

A solar cell of 350 V is feeding power to an ac supply of 440 V, 50 Hz through a 3-phase fully controlled bridge

Description : A solar cell of 350 V is feeding power to an ac supply of 440 V, 50 Hz through a 3-phase fully controlled bridge converter. A large inductance is connected in the dc circuit to maintain the dc current at 20 A ... thyristor will be reverse biased for a period of  (A) 125o (B) 120o (C) 60o (D) 55o

Last Answer : A solar cell of 350 V is feeding power to an ac supply of 440 V, 50 Hz through a 3-phase fully controlled bridge converter. A large inductance is connected in the dc circuit to maintain the ... the solar cell resistance is 0.5 Ohm ,then each thyristor will be reverse biased for a period of 125o

A single-phase, 230 V, 50 Hz ac mains fed step down transformer (4:1) is supplying power to a half-wave

Description : A single-phase, 230 V, 50 Hz ac mains fed step down transformer (4:1) is supplying power to a half-wave uncontrolled ac-dc converter used for charging a battery (12 V dc) with the series current limiting resistor being 19.04 Ohm. The charging current is  (A) 2.43 A (B) 1.65 A (C) 1.22 A (D) 1.0 A

Last Answer : A single-phase, 230 V, 50 Hz ac mains fed step down transformer (4:1) is supplying power to a half-wave uncontrolled ac-dc converter used for charging a battery (12 V dc) with the series current limiting resistor being 19.04 Ohm. The charging current is 1.0 A

In practice, a current source inverter consists of an AC/ DC converter with a large inductance ‘L’ in the output.

Description : In practice, a current source inverter consists of an AC/ DC converter with a large inductance ‘L’ in the output. This inductance maintains a ……… …………through the switching devices over short interval of time. A) constant current B) constant voltage C) constant power D) none of the (A), (B), (C)

Last Answer : In practice, a current source inverter consists of an AC/ DC converter with a large inductance ‘L’ in the output. This inductance maintains a constant current through the switching devices over short interval of time. 

For an existing ac transmission line, the string efficiency is 80%, if dc...

Description : For an existing ac transmission line, the string efficiency is 80%, if dc voltage is supplied for the same setup, the string efficiency will be?

Last Answer : 100%

When MMA welding what will be the effect on the weld f the power source was changed from AC to DC-ve? a) None b) Higher deposition rate c) It would slightly increase the depth of penetration d) The arc would become unstable

Description : When MMA welding what will be the effect on the weld f the power source was changed from AC to DC-ve? a) None b) Higher deposition rate c) It would slightly increase the depth of penetration d) The arc would become unstable

Last Answer : b) Higher deposition rate

An inverter converts

Description : An inverter converts  A) d.c. voltage to variable d.c. voltage B) ac. voltage to d.c. voltage C) d.c. voltage to ac. voltage of constant frequency D) d.c. voltage to ac. voltage of variable frequency 

Last Answer : An inverter converts d.c. voltage to a.c. voltage of variable frequency 

The output voltage waveform of a three-phase square-wave inverter contains

Description : The output voltage waveform of a three-phase square-wave inverter contains  (A) only even harmonics (B) both odd and even harmonic (C) only odd harmonics (D) only triple harmonics

Last Answer : C

“Six MOSFETs connected in a bridge configuration (having no other power device) must be operated as a

Description : Six MOSFETs connected in a bridge configuration (having no other power device) must be operated as a Voltage Source Inverter (VSI) . This statement is  (A) True, because being majority ... (D) False, because MOSFETs can be operated as excellent constant current sources in the saturation region.

Last Answer : “Six MOSFETs connected in a bridge configuration (having no other power device) must be operated as a Voltage Source Inverter (VSI)”. This statement is False, because MOSFETs can be operated as excellent constant current sources in the saturation region.

A single phase CSI has capacitor C as the load. For a constant source current, the voltage across the capacitor

Description : A single phase CSI has capacitor C as the load. For a constant source current, the voltage across the capacitor is   (A) square wave (B) triangular wave (C) step function (D) pulsed wave

Last Answer : Step function

How do you find power in a circuit?

Description : How do you find power in a circuit?

Last Answer : Power can be find in a circuit by the means of meters .if an individual want to check for a power in a circuit he/she Calabria the meters on a high voltage range and put the meters Lee in parallel with the circuit he /she will know the amount of power within that circuit .

A variable shunt, connected across the series field coils of a DC compound wound generator, to permit adjustment of the degree of compounding, is called a _____________. A. divider B. diverter C. converter D. rheostat

Description : A variable shunt, connected across the series field coils of a DC compound wound generator, to permit adjustment of the degree of compounding, is called a _____________. A. divider B. diverter C. converter D. rheostat

Last Answer : Answer: B

The MIL is illuminated and a battery module deterioration diagnostic trouble code is stored the most like cause is a failed by a) High voltage battery b) High voltage inverter c) Motor/ generator d) DC/ DC converter

Description : The MIL is illuminated and a battery module deterioration diagnostic trouble code is stored the most like cause is a failed by a) High voltage battery b) High voltage inverter c) Motor/ generator d) DC/ DC converter

Last Answer : a) High voltage battery

A DC reactor is connected in series with each pole of a converter station in order to:

Description : A DC reactor is connected in series with each pole of a converter station in order to: A) prevent commutation failures in the inverter B) supply reactive power to the converter C) improve system stability D) increase the power transfer capability

Last Answer : A DC reactor is connected in series with each pole of a converter station in order to:  prevent commutation failures in the inverter

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling

Description : A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor :  (A) can be operated in first quadrant (B) ... in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

Last Answer : A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : can be operated in first & fourth quadrants

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms

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

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

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

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

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

I want to know what type of current does lightning consist of an ac, or dc?

Description : I want to know what type of current does lightning consist of an ac, or dc?

Last Answer : I thought ac meant alternating current, and dc meant direct current.

What type of current would flow through the load in figure 'B' shown in the illustration? EL-0091 A. AC only B. DC only C. AC or DC depending on control winding polarity D. AC or DC depending on instantaneous polarity of the source

Description : What type of current would flow through the load in figure 'B' shown in the illustration? EL-0091 A. AC only B. DC only C. AC or DC depending on control winding polarity D. AC or DC depending on instantaneous polarity of the source

Last Answer : Answer: B

How does a DC to AC inverter work?

Description : How does a DC to AC inverter work?

Last Answer : Start with a switching circuit that supplies the DC with one polarity then reverses the polarity, back and forth. That's done at the target AC frequency. An inverter that's any good will knock ... and will further attempt to smooth the wave to more closely resemble normal AC power from the mains.

Can you hook up a capacitor to a home AC amp like you would in a car's DC amp? Possible at all?

Description : Can you hook up a capacitor to a home AC amp like you would in a car's DC amp? Possible at all?

Last Answer : I can’t see the word capacitor without immediately thinking of The Flux Capacitor and Back to the Future, doesn’t help you much, sorry.

How many AC volts is 1 volt DC?

Description : How many AC volts is 1 volt DC?

Last Answer : They are apples and oranges. You can convert one to the other, depending on the amperage, but there is no corrolation between DC and AC.

What is Your Favourite Song From the New AC/DC Album "Black Ice"?

Description : What is Your Favourite Song From the New AC/DC Album "Black Ice"?

Last Answer : Well I haven’t really got to listen to it all the way through yet, but I’m really liking Money Made. Today, I plan to finish up listening and then I can give you my final verdict. Money Made, from what I’ve heard of it, sounds like a winner though!

4. The essential difference between an AC generator and a DC generator is that -Physics-10

Description : 4. The essential difference between an AC generator and a DC generator is that -Physics-10

Last Answer : AC generator has slip rings while the DC generator has a commutator. AC generators have two rings known as the slip rings while DC generators have two half rings known as the commutator. This is main difference between AC generator and DC generator.

In trapezium ABCD, AB|| DC and diagonals AC and BD intersect at O. If area of triangle AOD is 30cm square , find the area of triangle BOC -Maths 9th

Description : In trapezium ABCD, AB|| DC and diagonals AC and BD intersect at O. If area of triangle AOD is 30cm square , find the area of triangle BOC -Maths 9th

Last Answer : In the given figure: Area of triangle ADC = Area of triangle BCD (Triangles on the same and parallel) Now subtract the area of triangle DOC from both of them so... (Area of triangle ADC - Area of ... => Area of triangle AOD = Area of triangle BOC Hence the area of triangle BOC is 30 cm square.

In figure, ABCDE is any pentagon. BP drawn parallel to AC meets DC produced at P and EQ drawn parallel to AD meets CD produced at Q. -Maths 9th

Description : In figure, ABCDE is any pentagon. BP drawn parallel to AC meets DC produced at P and EQ drawn parallel to AD meets CD produced at Q. -Maths 9th

Last Answer : Given ABCDE is a pentagon. BP || AC and EQ|| AD. To prove ar (ABCDE) = ar (APQ) Proof We know that, triangles on the same base and between the same parallels are equal in area. Here, ΔADQ and ΔADE lie on the ... ar (ΔACD) = ar (ΔADE) + ar (ΔACB) + ar (ΔACD) ⇒ ar (ΔAPQ) = ar (ABCDE) Hence proved.

In trapezium ABCD, AB|| DC and diagonals AC and BD intersect at O. If area of triangle AOD is 30cm square , find the area of triangle BOC -Maths 9th

Description : In trapezium ABCD, AB|| DC and diagonals AC and BD intersect at O. If area of triangle AOD is 30cm square , find the area of triangle BOC -Maths 9th

Last Answer : In the given figure: Area of triangle ADC = Area of triangle BCD (Triangles on the same and parallel) Now subtract the area of triangle DOC from both of them so... (Area of triangle ADC - Area of ... => Area of triangle AOD = Area of triangle BOC Hence the area of triangle BOC is 30 cm square.

In figure, ABCDE is any pentagon. BP drawn parallel to AC meets DC produced at P and EQ drawn parallel to AD meets CD produced at Q. -Maths 9th

Description : In figure, ABCDE is any pentagon. BP drawn parallel to AC meets DC produced at P and EQ drawn parallel to AD meets CD produced at Q. -Maths 9th

Last Answer : Given ABCDE is a pentagon. BP || AC and EQ|| AD. To prove ar (ABCDE) = ar (APQ) Proof We know that, triangles on the same base and between the same parallels are equal in area. Here, ΔADQ and ΔADE lie on the ... ar (ΔACD) = ar (ΔADE) + ar (ΔACB) + ar (ΔACD) ⇒ ar (ΔAPQ) = ar (ABCDE) Hence proved.

ABC and DBC are two triangles on the same BC such that A and D lie on the opposite sides of BC,AB=AC and DB = DC.Show that AD is the perpendicular bisector of BC. -Maths 9th

Description : ABC and DBC are two triangles on the same BC such that A and D lie on the opposite sides of BC,AB=AC and DB = DC.Show that AD is the perpendicular bisector of BC. -Maths 9th

Last Answer : Solution :-

In Fig. 9.30, ABCDE is any pentagon. BP drawn parallel to AC meets DC produced at P and EQ drawn parallel to AD meets CD produced at Q. Prove that ar (ABCDE) = ar(APQ). -Maths 9th

Description : In Fig. 9.30, ABCDE is any pentagon. BP drawn parallel to AC meets DC produced at P and EQ drawn parallel to AD meets CD produced at Q. Prove that ar (ABCDE) = ar(APQ). -Maths 9th

Last Answer : hope its clearhope its clear

In Fig. 10.20, two circles intersects at two points A and B.AD and AC are diameters to the circles. Prove that B lies on the line A segment DC. -Maths 9th

Description : In Fig. 10.20, two circles intersects at two points A and B.AD and AC are diameters to the circles. Prove that B lies on the line A segment DC. -Maths 9th

Last Answer : Solution :- Jion AB ∠ABD = 90° (Angle in a semicircle) Similarly, ∠ABC = 90° So, ∠ABD + ∠ABC = 90° + 90° = 180° Therefore,DBC is a line i.e.,B lies on the segment DC.

What is main difference ac and dc bridges?

Description : What is main difference ac and dc bridges?

Last Answer : The voltage source is different. Initial measured readingsettling time in AC bridge is far less compared to DC bridges

What is the process called when converting AC to DC?

Description : What is the process called when converting AC to DC?

Last Answer : Feel Free to Answer

Who are the AC DC original members?

Description : Who are the AC DC original members?

Last Answer : Need answer

Are ac drives better than dc drives?

Description : Are ac drives better than dc drives?

Last Answer : Yes, ac drives are better than dc drives. You can find more info at en.wikipedia.org/wiki/Variable-frequency_drive or www.avtron.com/ac_vs_dc.htm

What genre is AC/DC?

Description : What genre is AC/DC?

Last Answer : AC/DC plays hardcore punk but call them rock and roll that's what they like to be called. They aren't metal.

Is a car battery AC or DC volts?

Description : Is a car battery AC or DC volts?

Last Answer : dc - the voltage is a constant 12 volts nominally in a normal car battery.

Is a car battery AC or DC volts?

Description : Is a car battery AC or DC volts?

Last Answer : dc - the voltage is a constant 12 volts nominally in a normal car battery.

The advantage of AC over DC is that (a) it contains more electrical energy (b) it is free from voltage fluctuations (c) it generation costs much less (d) it can be transmitted over long distances with minimum power loss

Description : The advantage of AC over DC is that (a) it contains more electrical energy (b) it is free from voltage fluctuations (c) it generation costs much less (d) it can be transmitted over long distances with minimum power loss

Last Answer : Ans:(d)

A transformer is a device for (a) stepping up (or down) DC voltage (b) generating electricity (c) stepping up (or down) AC voltage (d) converting AC into DC

Description : A transformer is a device for (a) stepping up (or down) DC voltage (b) generating electricity (c) stepping up (or down) AC voltage (d) converting AC into DC

Last Answer : Ans:(c)