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.

What is servo motor and what are the applications of servo motor?

0 Answers   BARC,

what happen when we add mentos in cold drink?& why?

0 Answers  

how to 2 phase supply from 3 phase

1 Answers  

What will happen to transformer if we gave 5HZ input instead of 50/60Hz??? explain with reason

2 Answers  

What is the difference between ACB & MCCB?

7 Answers  

hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com

0 Answers   RRB,

Why thwe Direction of Rotation of a TABLE Fan & CEILING Fan are different?

8 Answers   Wipro,

How transformer neutralshould earthed ? Transformer neutral connected to earth mat in substations, right or wrong ?

4 Answers  

Is it necessary to place tap changer in secondary winding or we can use on both sides?

3 Answers  

11kV capacitor bank of rating 2.4KVAR, is charged with protective relays of only over current & Earth fault &.......without Over Voltage, Under Voltage & Neutral Displacement Relay. Is it advisable??

0 Answers  

1 sq.mm alluminum cable hou much current caraing capacity

5 Answers  

What is Single Phasing fault???(not single-phase fault)

6 Answers   ABB,