# Electronics and Communication Engineering - Exam Questions Papers

6.
For a series resonant circuit at low frequency circuit impedance is __________ and at high frequency circuit impedance is __________
Fill in the blanks respectively
capacitive, inductive
inductive, capacitive
resistive, inductive
capacitive, resistive
Explanation:

From this curve; we can select option (a) as correct answer.

7.
The network is
First order system and the pole
Second order system of the two poles are
Second order system of the poles is
none of the above
Explanation:

System T.F. =

Characteristic equation:

So system is second order system of the two poles are .

8.
A signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The minimum sampling rate is :
62831.9 V/sec
125663.8 V/sec
31415.95 V/sec
None
Explanation:

Maximum sampling rate = 2pfmax V.

9.
The circuit below represents function X(A, B, C, D) as:
Σ(5, 8, 13, 14)
∏(0, 1, 2, 3, 4, 6, 7, 8, 10, 11, 12)
Σ(5, 9, 13, 14)
∏(0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 15)
Explanation:

X = A B C(0. D + 0.D) + A B C(0.D + 0.D) + A B C(0.D + 1.D) + A B C(0.D + 0.D)

+ A B C(0.D + 0.D) + A B C(0.D + 1.D) + ABC(1.D + 0.D)

= ∑(5, 9, 13, 14).

10.
The truth table corresponding to the given input digital gate :