Practice Test: Electronics Engineering (ECE)- 10 - Electronics and Communication Engineering (ECE) MCQ

If the average of squares of 10 observations is 34 and their average is 5, then their standard deviation is ______   

The state equation of the circuit shown in figure is

The dual of the network shown below will be

An unregulated power supply of 25 V is connected to zerer diodes and p - n diodes (cut in voltage 0.7V) as shown in figure, then the values of x and y, 7 are? 

The load lines were drawn for the circuit collector Resistance Re = x, and y. From the graph we can conclude that 

A silicon diode has saturation current of 6 nA, at 25°C. The saturation current at 100°C is

The CMRR of the differential Amplifier shown Here is

The OP-Amp circuit shown acts as

The base of the number system, in which the operation is correct?

The minimized Boolean expression of 'F is 

A mod 16 counter with Asynchronous, Active low clear input is arranged as shown in figure. It works like a

The discrete fourier series coefficients of 

The z transform of na^n-1 u[n] given by

if y(t) = x(t) * h(t), then x(t -t₁) *h (t- t₂) is

A control system is represented by signal flow graph as shown, C(s) is the output, then

Range of 'k' for which the feed back system is stable, s(s² + s + 1) (s + 4) + k = 0

Band width of an FM system is 180 KHz, when audio frequency 15 KHz is FM modulated, The frequency deviation is _______ KHz

Propagation delay for a 1 km optical fibre cable witha core index of refraction as 1.5 is

A narrow band signal occupying a frequency range of nfo to (n + 1) f₀ is to be sampled. The maximum sampling rate is

A transmission line is distortion less if

Distilled water at 25°c is characterized by σ = 1.7 x 10^-4 mho/m, and s = 78ε₀. at freauencv of 3GHz. Its loss tangent tan

The depth of penetration of electromagnetic wave in a medium having conductivity σ at a frequency of 1MHz is 25 cm. The depth of penetration at a frequency of 4MHz will be_____ cm

There are three bags each containing five white balls and two black balls constituting group A and two bags each containing one white ball and four black balls constituting group B. A bag is randomly selected and a ball is drawn from it It was found to be a black ball. What is the probability that the b.alf is drawn from a bag in group A?

Find a real root of the equation x³ + 2x - 1 = 0.

Solve the differential equation

The value of the Fourier cosine expansion of the function f(x) = x in the interval

The voltage V across the Resistor ‘R’ in the circuit is