IndiaBIX

Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 8
6.
In a J-K FF we have J = Q and K = 1. Assuming the FF was initially cleared and then clocked for 6 pulses, the sequence at the Q output will be
010000
011001
010010
010101
Answer: Option
Explanation:

7.
The following sequence represents autocorrelation of a real valued signal. The energy of real valued sequence is given by __________ x(n) = {1, _, 3, _, 5, _, 7, _, 9, 10, _, 8, _, 6, _, 4, _, 2, _}
↑
2[12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 + 92] + 102
10
102
2[12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 + 92 + 102]
Answer: Option
Explanation:

R x (t) ⇒ t → 0

Rx(0) = E.

8.
The Vs is given by
8 V
13 V
1 V
4 V
Answer: Option
Explanation:

Using Nodal analysis

...(i)

...(ii)

∴ V2 = 2Vx

∴ V2 = 2V ...(iii)

...(iv)

Put V2 = 2V

Put in equation (iii), Vs = 3V1 - V2

Vs = 3 x (+5V) - 2V

Vs = 15V - 2V = 13V.

9.
The current I in the circuit shown in
- j1 A
j1 A
0 A
20 A
Answer: Option
Explanation:

10.
The magnitude plot of a composite signal x(t) = e3jt + e4jt is __________ .
Half wave rectified sinusoid
Full wave rectified sinusoid
Exponentially increasing sinusoid
Exponentially decreasing sinusoid
Answer: Option
Explanation:

x(t) = ej3.5t(e-j05t + ej0.5t)

x(t) = 2ej3.5t cos(0.5)t

The magnitude of x(t) is |x(t)| = 2|cos(0.5)t|.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers