2.6k views
0 answers
asked
Jul 25, 2019
by
anonymous

Can transformer convert AC to DC?
Last Answer : No, Transformer cannot convert AC to DC.
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3.0k views
9 answers
asked
Dec 9, 2017
by
anonymous

Last 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.
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187 views
1 answer
asked
Feb 24, 2018
by
Amit Sharma

Last Answer : Yes ,it is one of the main advantage using thristors as a switch in DC circuit ,it has a high current gain
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161 views
2 answers
asked
Mar 6, 2018
by
anonymous

Last Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.
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149 views
2 answers
asked
Sep 13, 2017
by
anonymous

Last Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.
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139 views
2 answers
asked
Sep 13, 2017
by
anonymous

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
Last 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
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344 views
1 answer
asked
Apr 29, 2018
by
anonymous

State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
Last 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
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387 views
1 answer
asked
May 7, 2020
by
anonymous

Compare the AC and DC Arc lamps.
Last 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
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253 views
1 answer
asked
May 3, 2020
by
anonymous

What is the advantage of AC over DC electrical transmission?
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82 views
0 answers
asked
Apr 26, 2020
by
anonymous

Why are DC motors used in trains and not AC motors ?
Last 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.
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164 views
1 answer
asked
Sep 3, 2019
by
anonymous

Why is AC considered more efficient than DC?
Last 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.
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100 views
1 answer
asked
Aug 28, 2019
by
anonymous
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Which is more dangerous AC or DC and why ?
Last Answer : Dc is more dangerous than Ac because in Ac the voltage will varies but in dc the constant voltage
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152 views
2 answers
asked
Aug 28, 2019
by
anonymous

What is the conversion between. AC to AC ? DC to DC? AC to DC? DC to AC ?
Last 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
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101 views
1 answer
asked
Aug 15, 2019
by
anonymous

Is the power line voltage available in our homes a dc or an ac voltage?
Last 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.
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5.2k views
1 answer
asked
Jun 29, 2019
by
anonymous

Do you think is DC better than AC to transmit energy?
Last 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
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468 views
2 answers

Distinguish between AC and DC.
Last 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.
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464 views
2 answers
asked
Aug 8, 2018
by
anonymous

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
Last 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 .
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144 views
2 answers
asked
May 8, 2018
by
anonymous

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
Last 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
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186 views
1 answer
asked
Apr 29, 2018
by
anonymous

What is the difference between an AC and DC generator?
Last 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.
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317 views
1 answer
asked
Mar 15, 2018
by
anonymous

Do cell phones use AC or DC current?
Last Answer : DC of course.
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210 views
2 answers
asked
Mar 14, 2018
by
anonymous

Is current from a battery AC or DC?
Last Answer : The current from the battery is DC
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135 views
2 answers
asked
Mar 14, 2018
by
anonymous

Is electricity generated in AC or DC?
Last Answer : Electricity is generated in AC.
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131 views
1 answer
asked
Mar 10, 2018
by
anonymous

What is the difference between AC and DC drive?
Last Answer : AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz
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156 views
1 answer
asked
Mar 10, 2018
by
anonymous

What is the use of AC and DC drives?
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84 views
0 answers
asked
Mar 10, 2018
by
anonymous

Is it AC or DC electricity in the home?
Last Answer : Obviously its A.C
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200 views
4 answers
asked
Mar 10, 2018
by
anonymous

are AC and DC resistances same?
Last 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
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82 views
1 answer
asked
Oct 18, 2017
by
anonymous

Last Answer : Induction motor is a AC motor it is also known as asynchronous motor .
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101 views
1 answer
asked
Sep 9, 2017
by
anonymous

Thyristor can be protected from over voltages by using
Last Answer : Thyristor can be protected from over voltages by using Voltage clamping device
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108 views
1 answer
asked
May 8, 2018
by
anonymous

Leakage current flows through the thyristor in
Last Answer : Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.
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211 views
1 answer
asked
May 8, 2018
by
anonymous

What is a phase control thyristor?
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153 views
0 answers
asked
Mar 19, 2018
by
anonymous
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Why thyristor are not preferred for inverter?
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455 views
0 answers
asked
Mar 19, 2018
by
anonymous

What is thyristor family?
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67 views
0 answers
asked
Mar 19, 2018
by
anonymous

What is meant by firing angle of thyristor?
Last Answer : The point at which SCR is triggered is known as firings angle of thyristor.
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234 views
1 answer
asked
Mar 19, 2018
by
anonymous

What is the use of a thyristor in a circuit?
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2.9k views
0 answers
asked
Mar 19, 2018
by
anonymous
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What is a reverse conducting thyristor?
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87 views
0 answers
asked
Mar 19, 2018
by
anonymous

What is the function of a thyristor?
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93 views
0 answers
asked
Mar 19, 2018
by
anonymous

Why SCR is called as thyristor?
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97 views
0 answers
asked
Mar 19, 2018
by
anonymous

Is a SCR a thyristor?
Last Answer : Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.
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162 views
1 answer
asked
Mar 19, 2018
by
anonymous

What is the application of thyristor?
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90 views
0 answers
asked
Mar 19, 2018
by
anonymous

Explain thyristor gate drive circuit.
Last 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.
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3.0k views
1 answer
asked
Feb 19, 2018
by
anonymous

parallel operation of MOSFET can be done more easily as compared to thyristor. why?
Last Answer : Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In ... the parallel operation of MOSFET can be done more easily as compared to the thyristor.
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300 views
1 answer
asked
Dec 7, 2017
by
anonymous

what are the disadvantages of thyristor?
Last 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
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888 views
2 answers
asked
Dec 6, 2017
by
anonymous

write short notes on thyristor CSI .
Last Answer : Current-source inverter (CSI) is an inverter with a DC current input. Current source inverters are most commonly used in very high power AC motor drives.
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107 views
2 answers
asked
Nov 15, 2017
by
anonymous
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Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.
Last 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).
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1.7k views
1 answer
asked
Aug 8, 2017
by
anonymous

In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction
Last Answer : In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region
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182 views
1 answer
asked
Apr 29, 2018
by
anonymous

Which type of starter is used to start the DC motor?
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77 views
0 answers
asked
Mar 15, 2018
by
anonymous

Why DC motor is used for traction?
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81 views
0 answers
asked
Mar 11, 2018
by
anonymous

Can we convert pdf to rtf and txt, and how?
Last Answer : There are online converters out there that do that, here’s a program. Also this one that should do more file types.
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1 view
1 answer
asked
Feb 27
by
anonymous
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How to Convert Decimals to Fractions
Last Answer : How to Convert Decimals to Fractions Whether it's homework for a grade school student or a business problem, math is an essential skill in life. One of the most common math problems is ... and tricks, you don't have to worry about having to grapple with complicated conversion problems anymore.
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7 views
1 answer
