Answer / sujin

For a dc signal frequency is approximately 0.
For a capacitor reactance ( Xc) is 1/2*3.14*f
Since f is or approximately 0 Xc= infinity.
Hence it blocks dc current

Answer / manishsingh

i=C(dV/dt)
for dc instantaneous change in voltage=o
dV/dt=o
...i=o for dc supply mens no current..

so capacitor block dc supply

Answer / bhabani

capacutive reactance is inversely proportional to frequency.
for dc f=0.thus very high reactance to current

Answer / devsingh boda

ANS1,ANS3,ANS4 are correct.ie,
We can answer this question in two ways,
1.Capacitive reactance is inversely proportional to frequency since,Xc=[1/(2*Pi*f*C)] which implies Xc is inversely proportional to f. For dc f=0 , so Xc is approximately equal to infinite(very high).So current does not flow.

2.We know that capacitive current, Ic=C*[dVc/dt]...
If dc supply is applied across capacitor then dVc/dt becomes zero since dc voltage is a constant(steady) voltage.So Ic also becomes zero.

Answer / shahbaz

because the capacitor is used to store the charges and in
const supply there is no any storege is carried out hence
ckt is not complete.

How to connect the chemical earthing and complete process tell me plz

0 Answers  

Why we didn’t feel electric shock in an electric train ??

10 Answers   NTPC,

In DC while we mention the voltage we are using -48V but in case of AC we mention only 230V not -230V, why we using -48V not 48V

2 Answers  

what is corona effect

3 Answers  

How will polarity test of Dy5 Transformer ?

0 Answers  

What Is the Difference Between Lightening Spike and Lightening Arrester?

1 Answers  

Why inverter rating in KVA?

3 Answers  

What is Phase to Phase clearance for 800V System Operating Voltage as per IEC61439

0 Answers  

i have 6oo kva dry type transformer and its neutral is not grounded even body of transformer ground i want to know it is safe or not ?

2 Answers  

what is the difference between NC & CNC machine.what is the difference between equipment & machine tool

2 Answers  

Why don't connect earth wire to elcb?if earth fault occur,how will detect it

1 Answers   TATA, Tata Communications, Telecommunications,

How to know the back up time for a 5KVA UPS which is connected to 15 nos. of computers? Is there any formula for this? pls. tell me.

1 Answers   HAL,