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What is the use of AC and DC drives?

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Description : Do cell phones use AC or DC current?

Answer : DC of course.

Description : What is the difference between AC and DC drive?

Answer : AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz

Description : Why do we use AC current in our homes?

Answer : We used it for cooking rice,  For washing clothes and for lights in the house.

Description : What is the difference between an AC and DC generator?

Answer : The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

Description : What is the advantage of AC over DC electrical transmission?

Description : What is the conversion between. AC to AC ? DC to DC? AC to DC? DC to AC ?

Answer : 1.ac to ac is regulation 2.dc to dc is chopper 3.ac to dc is rectifier 4.dc to ac is inverter

Description : Compare the AC and DC Arc lamps.

Answer : AC Arc Lamp DC Arc Lamp Cross section area of electrode is same Cross section area of electrode is positive rod is twice that of negative rod Series inductor is used for stability ... supply is used for DC arc lamp Luminous efficiency is less Luminous efficiency is high

Description : Why are DC motors used in trains and not AC motors ?

Answer : The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is zero..so it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

Description : Which is more dangerous AC or DC and why ?

Answer : Dc is more dangerous than Ac because in Ac the voltage  will varies but in dc the constant voltage 

Description : Distinguish between AC and DC.

Answer : Particulars Direct Current Alternating Current Definition It is the current whose magnitude and direction do not change with respect to time. It is the current whose ... system, electroplating, Battery charging, Traction. AC machines, Domestic and industrial supply.

Description : Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

Answer : Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

Description : are AC and DC resistances same?

Answer : Resistance is the ability of a circuit or element (which is called resistor) to oppose current. Examples of Resistors with the ability of high resistance are Wood, Air, Mica, Glass, Rubber, Tungsten ... constant. Therefore, only the original resistance of wire comes into play. they are not the same

Description : State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Answer : Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows:  1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine 

Description : Why is AC considered more efficient than DC?

Answer : Ac is more efficient than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transmission. When fault occurs it is easy to interrupt ac supply.

Description : Is the power line voltage available in our homes a dc or an ac voltage?

Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

Description : Do you think is DC better than AC to transmit energy?

Answer : In Long distance DC transmission will be better in cost. It requires more equipments for flexiblity In short distance AC transmission is better in  cost. It is more Flexible

Description : The main advantage of AC over DC is:  (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above

Answer : Ac is easy to maintain and ac can be easily converted to dc by rectifier .There is no commutator for conversion in ac that's why ac machines are weight less and more efficiency.ac machines occupy less space than dc .

Description : How is a thyristor used to convert AC to DC?

Description : Is current from a battery AC or DC?

Answer : The current from the battery is DC

Description : Is electricity generated in AC or DC?

Answer : Electricity   is  generated  in  AC.

Description : Is it AC or DC electricity in the home?

Answer : Obviously its A.C

Answer : Igbt alone cant convert dc to ac. igbt half bridge or full bridge or three phase topology could be used to convert dc to ac. also igbt gates should be driven by microcontroller or pwm/spwm gate driving signals ... e4(-) and g4 c2e1 and c4e3 pins are AC output pins. its name is igbt inverter.

Description : Can transformer convert AC to DC?

Answer : No, Transformer cannot convert AC to DC.

Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.

Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

Answer : Induction motor is a AC motor it is also known as asynchronous motor .

Answer : The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

Description : What is the use of an electric motor?

Answer : Electrical motors are use for converting electrical energy to mechanical energy. It may be use in fans, pumps, washing machine, cranes, trains, factories, industries etc.

Description : What are the factors to be considered while selection of motors for different drives?

Answer : Following Factors are considered while selecting electric drive (Motor) for particular application:  Factors to be considered for selection of Electrical Drives:  1) Nature of Supply:- Whether supply ... , load equalization 7) Cost: - Capital, Running and maintenance cost should be less.  

Description : Explain different gate drives techniques with base circuits and key features.

Description : With proper reason suggest type of enclosure for electric drives used in coal mines.

Answer : Flame-proof type of enclosure for electric drives is used in coal mines.  Reason: - Coal mines are very hazardous, prone to flame and explosions. Under such conditions, flame proof type ... them (due to arcs, sparks, or flashes) without igniting the surrounding flammable gases or vapors.

Description : State types of enclosures of electric drives.

Answer : Types of enclosures of Electric Drives: 1) Screen protected 2) Open type 3) Protected type 4) Totally enclosed 5) Drip-proof type 6) Pipe ventilated type 7) Flame proof type 8) Explosion proof 9) Splash proof.

Description : Can you guys explain the advantages of frequency converter against the star delta or soft starter?

Answer : ¬Soft starters  A soft starter is, as you would expect, a device which ensures a soft starting of a motor. A softstarter has different characteristics to the other starting ... at rated current from zero to full speed. Frequency converters are becoming cheaper all the time.

Description : Describe the difference between direct and alternating current.

Answer : Direct current is the flow of electricity or charge in one direction..  Alternative current is the flow of charge that doesn't flow in one direction. 

Description : All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

Answer : All the rules and laws of D.C. circuit also apply to A.C. circuit containing resistance only.

Description : Changeover from D.C to A.C  

Answer : In later half of eighties, in nineteenth century, it was proposed to have a power system with 3- phase, 50 Hz A.C generation, transmission and distribution networks. Once a.c system was adopted, transmission of ... favor of A.C supply system own the debate on switching over from D.C to A.C system. 

Description : State any four advantages of A. C. over D. C . 

Answer : Advantages of AC over DC: i) It is possible to use a transformer. ii) Distribution efficiency is high. iii) Generation is easy and economical. iv) Construction of ac equipment/ machines is robust and simple ... . vii) AC system is economical than DC system. viii) AC system is safer than DC system.

Answer : If a D.C. motor is connected across the A.C. supply it will burn due to heat produced in the field winding by eddy currents.

Answer : A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

Answer : If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

Description : Why is AC better for long distance power transmission than DC ?

Answer : ac is more economical to transmit for long distances . wires can be made smaller by step up transformer .. since major cost are wires to transmit .. then at the end of distance step down transformer is used for commercial use.

Description : Why can't we store AC in batteries instead of DC ?

Answer : Because the direction of the current changes in AC electricity, you cannot directly store the power. Placing a capacitor in an AC circuit has no effect on the alternating flow of the electricity. The only ... is indirectly, by storing DC and then using a power inverter to convert the DC to AC.

Description : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Answer : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

Description : What would happen if a DC motor was supplied with AC ?

Answer : With three phase induction motor, humming and not rotate, but if single phase universal motor like air blower, home mixture, motor run on constant speed..speed variation not possible...

Description : What is the use of transformer?

Answer : The use of transformer  is to do lower or raise  the voltage or currents in an electrical  circuit.  That's quite so simple. 

Description : What is the use of diode in the circuit?

Answer : Diode is a device which allows the flow of current in one direction and blocks the current in opposite direction.

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

Description : What is the use of a Mosfet?

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