An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then

Electronics and Communication Engineering (ECE) : Networks Analysis and Synthesis - Quiz(MCQ)

the polarity of voltage across R depends on time constant RC

the polarity of voltage across R is same during discharge and during charge

the polarity of voltage across R during discharging is opposite to that during charging

None of the above

Correct Answer : Option (C) : the polarity of voltage across R during discharging is opposite to that during charging

Explanation : Direction of current during discharging is opposite to that during charging.

Recently Updated in Networks Analysis and Synthesis Questions

Ohm's law is valid for

dc voltage and current

ac voltage and current

dc and ac voltages and currents

all voltages and current

Correct Answer : all voltages and current

Explanation : KCL and KVL are valid for voltages and currents of all wave shapes during transient as well as steady state conductions.

If e = 110 sin (ωt + p/3) and i = 5 sin (ωt - p/3), the impedance of the circuit is

11 Ω

16 Ω

22 Ω

30.8 Ω

Correct Answer : 22 Ω

Explaination :

Two phasors having rms values V₁ and V₂ which are added to give a phasor having rms value V₃. V₃ is maximum if phase angle between V₁ and V₂ is

90°

180°

270°

360°

Correct Answer :

360°

Explaination : Sum of phasors is maximum if they are in phase and 360° = 0.