Electronics & Communications Test

Result

Electronics & Communications Test - 5

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
2 / -0.66

A half-wave rectifier circuit using ideal diode has an input voltage of 20 sin ωt Volt. Then average and rms values of output voltage respectively, are

A

B

C

D

Solution

Concept:

For the half-wave rectifier, the output is present is only for one half of the input signal and clipped for the other half.

Positive half-wave rectifier clips the negative half of the input signal and only a positive part of the input signal is present.

Negative half-wave rectifier clips the positive half of the input signal and only negative part of the input signal is present

In a half-wave rectifier circuit, the average value of output voltage is:
Question 2
2 / -0.66

The RMS value of the signal shown in the figure is:

A

B

C
100/3

D
200/3

Solution
Question 3
2 / -0.66

Consider the circuit shown in the figure below:

If R_x = ∞, then the potential differences between two terminal a and b is equal to

A
12 V

B
-18 V

C
-3 V

D
-15 V

Solution

V_ab = V_a – V_b

For R_x = ∞ (Open-circuit), the circuit is redrawn as:
Question 4
2 / -0.66

The output (X) waveform for the combinational circuit shown below for the inputs A and B (waveform shown in the figure) will be –

(Assume no propagation delay)

A

B

C

D

Solution
Question 5
2 / -0.66

The Transmission Parameter of the given network are:

A

B

C

D

Solution
Question 6
2 / -0.66

Two Hertzian dipole antennas are placed at a separation of d = λ/4 on z-axis to form an antenna array. The current fed to the two antennas are I₁ and I₂. If I₂ lays behind I₁ by an angle of π/2 then the resultant field pattern of antenna array will be:

A

B

C

D

Solution

Explanation:
Question 7
2 / -0.66

From the four options given below, identify which of the given equation is invertible?

A
y(t) = x²(t)

B
y(t) = sin x(t)

C
y(n) = x(n) ⋅ x(n - 1)

D
y(t) = x(t - 3)

Solution

Invertibility: If the output is uniquely reproduced by input, then it called invertibility.

Analysis:

1) y(t) = x²(t)

For the input as x(t) and -x(t), the output is the same, i.e.
Question 8
2 / -0.66

A

B

C

D

Solution
Question 9
2 / -0.66

For the figure given above if, then the steady state error will be:

A
0

B
infinity

C
1

D
1/2

Solution

Concept:

Steady-state error is defined as the difference between the input and the output of a system in the limit as time goes to infinity (i.e. when the response has reached steady state).

The steady-state error will depend on the type of input (step, ramp, etc.) as well as the system type (0, I, or II).

The steady-state error of a unity feedback stable system
Question 10
2 / -0.66

A bandlimited Gaussian white noise PSD is given by

A

B

C

D

Solution

PSD is the Fourier transform of autocorrelation function.