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both ac as well as dc
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Description : why ohm's law is not applicable for ac circuit?

Answer : We can use Ohm's law for AC circuit if circuit consists of linear components and devices.

Description : Kirchhoff's current law is applicable to 1. Closed loops in a circuit 2. Junction in a circuit 3. Magnetic circuits Which of the above is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Answer : Kirchhoff's current law is applicable to 1. Closed loops in a circuit 2. Junction in a circuit 3. Magnetic circuits Which of the above is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Description : Ohm’s law is applicable to : (A) Semi-conductors (B) Vacuum tubes (C) Electrolytes (D) Semiconductors and Vacuum tubes

Answer : Ohm's law is not applicable to semi-conductors.

Description : is Ohms law applicable to vacuum tubes?

Answer : Ohm's law is not applicable to vacuum tubes.

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 : 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 cell phones use AC or DC current?

Answer : DC of course.

Description : Is current from a battery AC or DC?

Answer : The current from the battery is DC

Description : which is dangerous AC or DC ?

Answer : DC is more dangerous than AC. Because there is lowering of voltage and current in AC but in DC it is continuous or pulsating which is dangerous than AC.

Description : Explain Dalton's law of partial pressure. How it is applicable to condenser?

Answer : It states that' The pressure exerted by mixture of air and steam is equal to sum of partial pressures, which each constitute would exert, if it occupies the same volume .  In condenser total ... mixture of air and steam Pa = Partial pressure of air Ps = Partial pressure of steam

Description : Kirchhoff s law is not applicable to circuits with?

Answer : Kirchhoff's law is not applicable to circuits with distributed parameters.

Description : Kirchhoff s law is applicable to?

Answer : Kirchhoff s law is applicable to both a.c. as well d.c. circuits.

Description : Kirchhoffs current law is applicable to only?

Answer : Kirchhoffs current law is applicable to only junction in a network.

Description : A transformer (1) converts DC to AC (2) is used to decrease or increase AC voltage (3) converts AC voltage to D.C. voltage (4) converts electrical energy into mechanical energy

Answer : is used to decrease or increase AC voltage

Description : A Reactor having an inductive reactance of 4 ohm is connected to the terminals of a 120 V AC generator. Calculate the power associated with the reactor.  (A) 3.6 kvar (B) 30 kvar (C) 7.2 kvar (D) 4.16 kvar 

Description : The Kirchoff's law for a.c. is applicable upon consideration of -  a) Phasor sum b) Algebraic sum c) Progression sum d) Linear sum

Answer : The Kirchoff's law for a.c. is applicable upon consideration of - Phasor sum

Description : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

Answer : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm

Description : Do electric cars run on AC or 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 : Induction motor is a AC motor it is also known as asynchronous motor .

Description : A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance R. A voltmeter having a resistance of 1.2 kOhm is connected across 600 ohm resistances and reads 5 V. The value of resistance R shall be:

Answer : A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance R. A voltmeter having a resistance of 1.2 kOhm is connected across 600 ohm resistances and reads 5 V. The value of resistance R shall be: 2.4 kOhm

Description : A dc voltmeter has a sensitivity of 1000 Ohm/V. When it measures half full scale in 100 V range, the current through the voltmeter is

Answer : A dc voltmeter has a sensitivity of 1000 Ohm/V. When it measures half full scale in 100 V range, the current through the voltmeter is 1 mA.

Description : A 220 V dc machine has an armature resistance o f 1-ohm. If the full load current is 20A, the difference in the induced voltage when the machine is running as a motor, and as a generator is

Answer : A 220 V dc machine has an armature resistance o f 1-ohm. If the full load current is 20A, the difference in the induced voltage when the machine is running as a motor, and as a generator is 40 V.

Description : An R-L series AC circuit has R = 10 ohm and XL = 10 ohm. It is connected to an AC voltage source, the phase angle between voltage and current is (a) 30° (b) 45° (c) 60° (d) 36.8°

Description : does ohm's law apply to ac circuits?

Answer : Yes it does, but as it is supplied with ac we will have to take impedance in account.

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 : AC supply system compared to DC supply system has the advantage:

Answer : AC supply system compared to DC supply system has the advantage: low cost of switching

Description : A large dc motor is required to control the speed of the blower from a 3 -phase ac source. The suitable ac to dc converter is, 3 -phase (a) Fully controlled bridge converter ( ... bridge converter with freewheeling diode (c) Half controlled bridge converter (d) Converter pair in sequence control

Answer : A large dc motor is required to control the speed of the blower from a 3 -phase ac source. The suitable ac to dc converter is, 3 -phase Half controlled bridge converter

Description : Which rectifier can convert AC to DC? A. Half wave rectifier B. Full wave rectifier C. Bridge wave rectifier D. All of these 

Answer : Which rectifier can convert AC to DC? A. Half wave rectifier B. Full wave rectifier C. Bridge wave rectifier D. All of these 

Description : Which method is not used for conversion of AC to DC? A. Motor-generator set B. Rotary converter C. Metal rectifiers D. Dynamometers

Answer : Dynamometers method is not used for conversion of AC to DC.

Description : To enable dc series motor work satisfactory with an AC supply, the following modifications should be done (1) The yoke and poles should be completely laminated (2) The poles should be made of ... (3) The air gap between stator and rotor be reduced (4) Compensating poles should be introduced  

Description : Which of the following device converts DC to AC?  A) Rectifier B) Boost converter C) Transformer D) Inverter

Answer : Reflector

Description : A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

Description : The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 ... .5 A from the same source will be  (A) 48.0% (B) 57.1% (C) 59.2% (D) 88.8%

Answer : The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 48.0%

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

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 : 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 : 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 : when charging a battery we use a DC supply but not an AC supply. Why ?

Answer : When power is supplied to the battery, electrolyte inside the battery is divided into positive and negative ions, where ions with similar pole is gained in one side. This reactionʼs flow coincides with direct current.

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 : 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 : Why the Led Glow in Dc Supply ? Whenever give the Ac Supply What is Affect in Led ?

Answer : LEDs consume DC current to produce light; with AC current the LED will only be lit when current flow is in the proper direction. AC applied to an LED will cause it to blink on and off, and at high frequency the LED will appear to be lit continuously.

Description : Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance

Answer : Ans: i) Length of circuit - a) AC track circuit is having long length upto 3 to 5 km b) DC track circuit is having short length  ii)Application -a) AC track circuit is used ... ) Maintenance - a) AC track circuit has easier and cheaper maintenance b) DC track circuit has complicated maintenance 

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 : 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)

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. 

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 .

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