What is the direction of an AC current?
Last Answer : The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.
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2.6k views
2 answers
asked
Mar 14, 2018
by
anonymous

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching
Last Answer : The direction of rotation of an inverter fed 3-phase ac motor is reversed by changing the sequence of switching
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153 views
1 answer
asked
Apr 28, 2018
by
anonymous

What happens when you reverse the direction of the current in an electromagnet?
Last Answer : When you reverse current direction in an electromagnet, the magnetic poles will also change.
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172 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the induced current?
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81 views
0 answers
asked
Mar 14, 2018
by
anonymous

What is the direction of flow of current?
Last Answer : Current flows from anode to cathode(opposite direction to flow of electrons)
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95 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the conventional current flow?
Last Answer : The conventional current flow in opposite direction of flow of electrons. The electrons flow from negative terminal of battery to positive terminal of battery. And conventional current flow from positive terminal of battery to negative terminal of battery.
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101 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of flow of electric current in an electric circuit?
Last Answer : It flows from anode to cathode (direction of holes flow)
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171 views
1 answer
asked
Mar 14, 2018
by
anonymous

why current flows in opposite direction of electrons?
Last Answer : Hi team, the current flow is nothing but flow of electrons But the conventional direction I'd opposite to actual current flow . ..
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116 views
1 answer
asked
Oct 3, 2017
by
anonymous

Alternating current (AC)
Last Answer : AC stands for Alternating Current meaning voltage or current that changes polarity or direction respectively over time. An Alternating Current (AC) is an electric current whose magnitude ... energy are known as alternators and are simpler construction than DC electromechanical generators.
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181 views
2 answers
asked
Nov 22, 2019
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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134 views
2 answers
asked
Mar 14, 2018
by
anonymous
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Why do we use AC current in our homes?
Last Answer : We used it for cooking rice, For washing clothes and for lights in the house.
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193 views
3 answers
asked
Mar 11, 2018
by
anonymous

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?
Last Answer : In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of less than 15A.
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156 views
1 answer
asked
Mar 19, 2018
by
anonymous

Describe the difference between direct and alternating current.
Last 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.
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5.3k views
4 answers
asked
Jun 29, 2019
by
anonymous

The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
Last Answer : 45
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833 views
2 answers
asked
Mar 24, 2018
by
anonymous

Last Answer : The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.
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247 views
1 answer
asked
Mar 20, 2018
by
anonymous
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In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these
Last Answer : In a single-phase induction motor, the operating direction is determined by the Starting circuit
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127 views
1 answer
asked
Apr 29, 2018
by
anonymous

What is the direction of the induced electric field?
Last Answer : It is in opposite direction to the one that produced it.
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78 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the electric field?
Last Answer : Electric field is at right angle widh flow of current (right hand rule).
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127 views
1 answer
asked
Mar 14, 2018
by
anonymous

What is the direction of the flow of electrons?
Last Answer : Electrons flow cathode to anode or in an oposite direction of convection current flow or holes.
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110 views
1 answer
asked
Mar 14, 2018
by
anonymous

Last Answer : Yes DIAC can conduct in both direction.
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69 views
1 answer
asked
Sep 20, 2017
by
anonymous
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In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator
Last Answer : In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as synchronous generator
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599 views
1 answer
asked
May 1, 2018
by
anonymous
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Two non-collinear parallel equal forces acting in opposite direction?
Last Answer : Two non-collinear parallel equal forces acting in opposite direction constitute a couple.
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455 views
1 answer
asked
Mar 22, 2018
by
anonymous

Last Answer : The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.
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184 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.
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338 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.
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357 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : The direction of rotation of an hysteresis motor is determined by position of shaded pole with respect to main pole.
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230 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : In repulsion motor direction of rotation of motor is the same as that of brush shift.
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116 views
1 answer
asked
Mar 20, 2018
by
anonymous

How can we reverse the direction of rotation of synchronous motor?
Last Answer : By reversing supply phase sequence we can reverse the direction of rotation of synchronous motor.
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305 views
1 answer
asked
Mar 18, 2018
by
anonymous

What is the direction of flow when charging a capacitor?
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74 views
0 answers
asked
Mar 15, 2018
by
anonymous

Will the Dow Jones Iindustrial Average rise or fall on Moday the 2nd of August.
Last Answer : I can, with the utmost confidence, assert with 50% certainty that it will go up on 8/2/10.
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1 view
1 answer
asked
Feb 27
by
anonymous

How do you give your personal answer on this site?
Last Answer : I suggest starting a blog on blogspot. You might get a friend to help you with it. I’m guessing by the state of your writing-abilities you are not great with computers, but I’ll bet that you are an awesome artist! Good luck!
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1 view
1 answer
asked
Feb 26
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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160 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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99 views
1 answer
asked
Aug 28, 2019
by
anonymous

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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150 views
2 answers
asked
Aug 28, 2019
by
anonymous

Why is AC better for long distance power transmission than DC ?
Last 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.
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210 views
4 answers
asked
Aug 25, 2019
by
anonymous
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Why can't we store AC in batteries instead of DC ?
Last 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.
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114 views
3 answers
asked
Aug 19, 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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100 views
1 answer
asked
Aug 15, 2019
by
anonymous

AC generator
Last Answer : A.C power can be generated as a single phase or as a balanced poly-phase system. However, it was found that 3-phase power generation at 50 Hz will be economical and most suitable. Present day three phase generators ... has uniform air gap (figure 2.1(b)) and used when speed is high.
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2.4k views
1 answer
asked
Aug 8, 2019
by
anonymous

Define : i) Average value ii) RMS value of an AC Wave.
Last Answer : i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.
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385 views
1 answer
asked
Jul 30, 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
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AC Circuits with Resistance but No Reactance
Last Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.
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100 views
1 answer
asked
May 26, 2019
by
anonymous

What is the need of polarity marking in polyphase AC circuits?
Last Answer : Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.
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178 views
1 answer
asked
Sep 7, 2018
by
anonymous

Explain how sinusoidal AC voltage is generated by using simple one loop generator.
Last Answer : An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform.
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1.4k views
1 answer
asked
Sep 7, 2018
by
anonymous

‘PMMC instrument is not suitable to measure AC quantity’. State the reason.
Last Answer : The direction of force exerted on moving coil depends on the direction of current flowing through moving coil. If the direction of magnetic field is kept constant, it produces unidirectional torque if the current is ... on the coil in one cycle to zero. Hence the meter cannot read A.C. quantities.
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363 views
1 answer
asked
Sep 6, 2018
by
anonymous

Write short notes on 3 phase AC system.
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120 views
0 answers
asked
Aug 11, 2018
by
anonymous

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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462 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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143 views
2 answers
asked
May 8, 2018
by
anonymous

The ac bypassing of RF by CF in a common emitter configuration : (A) increases ac signal across emitter -base junction (B) decreases ac signal across emitter -base junction (C) decreases voltage amplification (D) stabilizes the Q -point
Last Answer : The ac bypassing of RF by CF in a common emitter configuration : increases ac signal across emitter -base junction
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109 views
1 answer
asked
Apr 30, 2018
by
anonymous
