Electronics and Communication Engineering - Networks Analysis and Synthesis

16.
In figure the open circuit emf is
15 V
1.45 V
1.475 V
1.485 V
Answer: Option
Explanation:

Since emfs of two cells are not equal, a circulating current flows.

.

OC emf = 1.5 - (0.25)(0.1) = 1.475 V.


17.
In a practical current source, the load current
is always equal to source current
is always less than source current
is always equal to or less than source current
cannot be higher than source current
Answer: Option
Explanation:

In a current source the source resistance is in parallel with the source. Some current flows through this source resistance.


18.
If
Answer: Option
Explanation:


19.
The pole zero diagram of an impedance Z has a pole at s = - 6 and zero at s = - 4 as shown in figure the constant multiplier k = 1. For a signal Is = cos 6t, the steady state voltage across Z is given in magnitude as under
0.6
0.84
7.2
none
Answer: Option
Explanation:

.


20.
A resistor R of 1 Ω and two inductor L1 and L2 of inductances 1 H and 2 H respectively, are connected in parallel. At some time, the current through L1 and L2 are 1 A and 2 A, respectively. The current through R at time t = ∞ will be
zero
1 A
2 A
3 A
Answer: Option
Explanation:

Resistor will get short circuited.