Electronics and Communication Engineering - Networks Analysis and Synthesis

6.
A resistance coil has self inductance L, resistance R and capacitance C. The impedance across the coil is
Answer: Option
Explanation:

The coil has R and L in series and C in parallel.


7.
In figure, the current iL at t = ∞ is
I
0
Answer: Option
Explanation:

At t = ∞, inductance behaves as short-circuit.


8.
When a lead acid cell is in fully charged condition the positive and negative plates are similar.
True
False
Answer: Option
Explanation:

They are similar in discharged condition.


9.
Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be
30 μC each
60 μC each
30 μC and 60 μC respectively
60 μC and 30 μC respectively
Answer: Option
Explanation:

Q1 = 1 x 10-6 x 30 = 30 μC, Q2 = 2 x 10-6 x 30 = 60 μC.


10.
In figure, the battery has remained switched on for a long time. At t = 0 the switch is closed. The current i(t) is likely to be
6
6 - 3e-1
6 + 3e-1
3 - 6e-1
Answer: Option
Explanation: