Recent questions tagged capacitor

Description : I need to buy really low voltage electrolytic capacitors.

Last Answer : answer:Allied Electronics http://www.alliedelec.com/ Weird hobby though.

Description : State the applications and specification of (i) Resistor (ii) Capacitor (iii)Inductor

Last Answer : Application of resistor: 1.Resistors are used in high frequency instrument. 2.Resistor is used in power control circuit. 3.It is used in DC power supplies. 4.Resistors are used ... DC Current  3.Electromagnetic Interference (EMI)  4.Magnetic Saturation Flux Density  5.Curie Temperature 

Description : Charging Action of capacitor

Last Answer : Charging Action of capacitor .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Description : Capacitor : Before charging takes place

Last Answer : Capacitor : Before charging takes place

Description : Why is a capacitor used in a single phase motor and not in three phase motor ?

Last Answer : In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

Description : Does current flow through a capacitor ?

Last Answer : Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

Description : Why is a capacitor used in a ceiling fan ?

Last Answer : For splitting phase so that a rotating magnetic field will be produced & as per Lenz's law a torque will be created & rotor starts rotating. In single phase if capacitor is not used for split phase then a pulsating mag. field is produced which is unable to produce torque on rotor

Description : Explain the working of a single phase capacitor start induction motor. 

Last Answer : Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

Description : Energy stored in capacitor examples

Last Answer : Energy stored in capacitor examples

Description : Series and parallel capacitor problem

Last Answer : Series and parallel capacitor problem 1 : https://youtu.be/MSl5mRwtjAE Series and parallel capacitor problem 2 : https://youtu.be/yGwbpyEtIyw Series and parallel capacitor problem 3 : https:// ... https://youtu.be/_7KwEwWqiNU Series and parallel capacitor problem 10 : https://youtu.be/et8MCWV_OyE

Description : Problem on capacitor

Last Answer : Problem on capacitor 1 : https://youtu.be/ZyT3WOFN8fs Problem on capacitor 2 : https://youtu.be/JBwEfekvutE Problem on capacitor 3 : https://youtu.be/E1lhIn5t8Mo Problem on capacitor 4 : https://youtu.be/yl651f4IUfg

Description : For a DC circuit capacitor is

Last Answer : For a DC circuit capacitor is virtually an open circuit

Description : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... in power systems to step down extra high voltage signals and provide low voltage D) None of these

Last Answer : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these

Description : What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero

Last Answer : What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero

Description : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

Last Answer : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

Description : What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these

Last Answer : What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these

Description : Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Last Answer : Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Description : Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Last Answer : Dielectric loss in a capacitor is best measured by Schering Bridge

Description : A capacitor is generally a?

Last Answer : A capacitor is generally a linear and bilateral component.

Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Last Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

Description : The best place to install a capacitor is?

Last Answer : The best place to install a capacitor is across the terminals of the inductive load.

Description : The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.

Last Answer : The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes 10 ohms.

Last Answer : Commonly used standard capacitor is concentric cylindrical type.

Last Answer : If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.

Description : When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is ?

Last Answer : When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is all right.

Last Answer : The capacitors used in single-phase capacitor motors have no polarity marking.

Last Answer : To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.

Last Answer : If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

Last Answer : Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because it has low starting as well as running currents at relatively high power factor.

Last Answer : In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.

Last Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

Last Answer : In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

Description : A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

Last Answer : A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

Last Answer : The value of starting capacitor of a fractional horse power motor will be 300 uF .

Last Answer : In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

Last Answer : In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.

Last Answer : In capacitor start single-phase motors current in the starting winding leads the voltage.

Last Answer : If the capacitor of a single-phase motor is short-circuited the motor will not start.

Description : Can we use the synchronous motor as the synchronous capacitor?

Last Answer : Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.

Description : Why shunt capacitor is used?

Last Answer : To improve voltage at receiving end and power factor

Description : Why capacitor bank is used?

Last Answer : In industrial or factory used E.B Power supply must be maintained above 0.90 power factor is compulsory for avoid EB Penalty. So APFC ( automatic Power factor control ) panel is used to maintained balance the load and PF maintained.

Description : How do you charge a capacitor with a battery?

Last Answer : The  capacitor  is  connected   in  parallel  with   the  battery.

Description : What is the symbol of a capacitor?

Last Answer : symbol of a capacitor

Description : Which side of a capacitor is negative?

Last Answer : In electrolytic type negative is shorter lead and usually mark in the tank. But of course not applicable to non-polar.

Description : What is the purpose of a capacitor in an AC circuit?

Last Answer : Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor

Description : How does a capacitor improve power factor?

Last Answer : Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.

Description : Do capacitors in parallel have the same voltage?

Last Answer : Not same but we will get addition of both values when capacitors are connected in parallel...

Description : what is the difference between capacitor and battery ?

Last Answer : A capacitor stores power but in very small quantitys and work in D/C and A/C circuits and it needs a power source from wich it gets the power it stores and a battery also stores power but in much larger quantitys measured in Amp/Hours

Last Answer : Capacitor use in fan is made up of dielectic material which is in semi solid material having high capacity.but generation of heat in capacitor the semi solid material converted into dry solid because of ... capacity becomes lower and lower so for good result of our fan we have to change it.

Description : Thyristor Switched Capacitor (TSC)

Last Answer : Thyristor Switched Capacitor (TSC)  TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.