Do cell phones use AC or DC current?
Last Answer : DC of course.
Show More
210 views
2 answers
asked
Mar 14, 2018
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.
Show More
5.2k views
1 answer
asked
Jun 29, 2019
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.
Show More
181 views
2 answers
asked
Nov 22, 2019
by
anonymous

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

How does AC current change direction?
Last Answer : This is because the angle at which the magnetic fields cuts across a winding changes its poles thus current has to change dirention .
Show More
92 views
1 answer
asked
Mar 14, 2018
by
anonymous

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.
Show More
2.6k views
2 answers
asked
Mar 14, 2018
by
anonymous

What is the use of AC and DC drives?
Show More
84 views
0 answers
asked
Mar 10, 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.
Show More
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
Show More
833 views
2 answers
asked
Mar 24, 2018
by
anonymous

Last Answer : The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.
Show More
173 views
1 answer
asked
Mar 21, 2018
by
anonymous

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.
Show More
114 views
3 answers
asked
Aug 19, 2019
by
anonymous

Can we apply the superposition theorem to AC circuit?
Show More
81 views
0 answers
asked
Mar 10, 2018
by
anonymous

Can we apply Norton's theorem in an AC circuit?
Show More
93 views
0 answers
asked
Mar 10, 2018
by
anonymous
.jpg)
Do people that have house cleaners have them because they are too lazy, or because they don’t have time to clean their homes themselves?
Last Answer : Some people are suffering from depression or (physical or mental ) disability and need home care. Also with the homecare they need house cleaners Other is people who never learned to be neat and clean, and will have to learn the hard way.
Show More
0 views
1 answer
asked
Feb 28
by
anonymous

How safe do you believe your home is for your child(ren) as opposed to other people's homes?
Last Answer : My house is terrible – way worse than average. There are open wall sockets, unprotected stairs, firearms, plugged in electric tools, cord hazards. Yikes. Good thing toddlers don’t visit often.
Show More
0 views
1 answer
asked
Feb 27
by
anonymous

Why don't banks just rent homes that are sitting empty or they can't sell right away?
Last Answer : Being a fan of real estate I try to pick the brains of investors whenever I can get and ear from them. There are some good points why banks do not rent property they have on their books. ... be in the money business, lending and gaining interest, not trying to run around collecting rent from people.
Show More
0 views
1 answer
asked
Feb 27
by
anonymous

When you visit other peoples' homes, are there ever things you see there that you wish you could have also?
Last Answer : I am staying at a friends house right now. I wish I had such a comfortable, clean, neat guest room. There is no way I can reciprocate at this level. He left a stack of Dilbert and Doonesbury anthologies by the bed and gave me the password to the wifi. Nice!
Show More
0 views
1 answer
asked
Feb 27
by
anonymous

What do you think of mobile homes?
Last Answer : They have the same inconveniences of a condo association, but for 1/6 the money. I think mobile homes are great, and cities should quit limiting the zones where they are allowed.
Show More
0 views
1 answer
asked
Feb 27
by
anonymous

What is the advantage of AC over DC electrical transmission?
Show More
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.
Show More
160 views
1 answer
asked
Sep 3, 2019
by
anonymous
.jpg)
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.
Show More
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
Show More
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.
Show More
210 views
4 answers
asked
Aug 25, 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
Show More
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.
Show More
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.
Show More
385 views
1 answer
asked
Jul 30, 2019
by
anonymous

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.
Show More
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.
Show More
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.
Show More
1.4k views
1 answer
asked
Sep 7, 2018
by
anonymous
.jpg)
‘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.
Show More
363 views
1 answer
asked
Sep 6, 2018
by
anonymous

Write short notes on 3 phase AC system.
Show More
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.
Show More
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 .
Show More
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
Show More
109 views
1 answer
asked
Apr 30, 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
Show More
179 views
1 answer
asked
Apr 29, 2018
by
anonymous

Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is
Last Answer : Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is constant
Show More
1.3k views
1 answer
asked
Apr 28, 2018
by
anonymous

A parallel AC. circuit in resonance will?
Last Answer : A parallel AC. circuit in resonance will have a high impedance.
Show More
354 views
1 answer
asked
Mar 25, 2018
by
anonymous

In AC. circuits, laminated iron is invariably used in order to?
Last Answer : In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.
Show More
105 views
1 answer
asked
Mar 25, 2018
by
anonymous

In an AC. circuit, a low value of kVAR compared with kW indicates?
Last Answer : In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.
Show More
712 views
1 answer
asked
Mar 25, 2018
by
anonymous

Do AC induction motors have back EMF?
Show More
71 views
0 answers
asked
Mar 15, 2018
by
anonymous

Why does a transformer only work with an AC supply?
Last Answer : The transformer work depends on the induction as main principle ,for that AC is the right means
Show More
150 views
3 answers
asked
Mar 14, 2018
by
anonymous

What is the symbol for AC power?
Last Answer : If you need to measure alternating current in a circuit, different multimeters have different symbols to measure it (and the corresponding voltage), usually "ACA" and "ACV," or "A" and "V" with a squiggly line (~) next to or above them.
Show More
2.6k views
1 answer
asked
Mar 11, 2018
by
anonymous

Can you apply Thevenin's theorem in an AC circuit?
Last Answer : It can be applied to AC circuits
Show More
105 views
1 answer
asked
Mar 10, 2018
by
anonymous
.jpg)
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.
Show More
185 views
1 answer
asked
Feb 24, 2018
by
Amit Sharma

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
Show More
82 views
1 answer
asked
Oct 18, 2017
by
anonymous

How can we increase the induced current?
Last Answer : Induced current can be increased by reducing no of windings on the secondary part compared to primary.
Show More
89 views
1 answer
asked
Mar 14, 2018
by
anonymous

In AC.S.R. conductors, the insulation between aluminium and steel conductors is (a) insulin (b) bitumen (c) varnish (d) no insulation is required
Last Answer : (d) no insulation is required
Show More
9 views
1 answer
.jpg)
What is AC ?
Last Answer : Ans. It is the current which changes its magnitude and direction periodically.
Show More
2 views
1 answer

Explain working of static AC circuit breaker.
Last Answer : Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.
Show More
208 views
1 answer
asked
May 21, 2020
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
Show More
380 views
1 answer
asked
May 7, 2020
by
anonymous
