Electronics and Communication Engineering (ECE)

The solution of 

The maximum theoretical efficiency of a class A amplifier can be

For a BJT, CE-mode, Base to emitter capacitance (Cπ) is 10 times the collector to base capacitance (Cµ). If transistor is biased at quiescent collector current ICQ = 1 mA, and its short circuit unity gain frequency is 0.909 M rad/sec, then the value of Cπ is _______ nF.

With 10 V dc connected at port A in the linear nonreciprocal two-port network
shown below, the following were observed :

(i) 1Ω connected at port B draws a current of 3A
(ii) 2.5 Ω connected at port B draws a current of 2A

With 10 V dc connected at port A, the current drawn by 7 Ω connected at port B
is

In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be

For what value of k, the equation 

x+y+z=1

2x+ y+ 4z =k

4x+ y+ 10z k =2

Have a solution

It is given that  y'' + 2y' + y = 0 y(0) = 0 , y(1) = 0 y(0.5) is _______

 An NMOS technology has μ_nC_ox = 50 μA/V² and V_t = 0.7 V. For a transistor with L = 1μm, find the value of W that results in g_m 1mA/V at I_D = 0.5 mA.

(Q.3-Q.5) Consider the amplifier below for the case V_DD = 5 V, R_D = 24 kΩ, (W/L) = 1 mA/V², and V_t = 1 V.

If the amplifier is biased to operate with an overdrive voltage V_OV of 0.5 V, find the incremental gain at the bias point.

Synchronous detector is used for demodulation of any signal when the modulation index is

Read the following paragraph and choose the correct statement.
Climate change has reduced human security and threatened human well being. An ignored reality
of human progress is that human security largely depends upon environmental security. But on the
contrary, human progress seems contradictory to environment security. To keep up both at the
required level is a challenge to be addressed by one and all. One of the ways to curb the climate
change may be suitable scientific innovations, while the other may be the Gandhian perspective on
small scale progress with focus on sustainability.

The bar graph given below shows the sales of books (in thousand number) from six branches of a publishing company during two consecutive years 2000 and 2001.
Sales of Books (in thousand numbers) from Six Branches - Bl, B2, B3, B4, B5 and B6 of a publishing Company in 2000 and 2001.

Q.

What is the ratio of the total sales of branch B2 for both years to the total sales of branch B4 for both years?

According to the Bohr’s model determine the radius of the first orbit of muon-proton system, if muon is 207 times heavier than electron –

Two key barriers to human communication are

What are the states of three ideal diodes of circuit shown below:

If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of

   then find 

A voltage having the laplace transform is applied across a 2H inductor having zero initial current What is the current in the inductor at t = ∞?

I ________ made arrangements had I _________informed earlier.

The pole-zero diagram of a causal and stable discrete-time system is shown in the figure. The
zero at the origin has multiplicity 4. The impulse response of the system is h[n]. If h[0] = 1,
we can conclude

The open loop transfer function 
Where p is an integer, is connected in unity feedback configuration as shown in figure.

Given that the steady state error is zero for unit step input and is 6 for unit ramp input, the value of the parameter p is _________.

The Newton-Raphson method formula for finding the square root of a real number R from the equation x² − R = 0 is

Consider an NMOS transistor having k_n= 2 mA/V². Let the transistor be biased at V_OV = 1V. For operation in saturation, what dc bias current I_D results? If a +0.1-V signal is superimposed on V_GS, find the corresponding increment in collector current by evaluating the total collector current I_D and subtracting the dc bias current I_D.

A periodic signal x(t) has a trigonometric Fourier series expansion

 we can conclude that

In the latch circuit shown, the NAND gates have non-zero, but unequal propagation delays. The present input condition is: P = Q = ‘0’. If the input condition is changed simultaneously to P = Q = ‘1’, the outputs X and Y are

Consider the D-Latch shown in the figure, which is transparent when its clock input CK is high and has zero propagation delay. In the figure, the clock signal CLK1 has a 50% duty cycle and CLK2 is a one-fifth period delayed version of CLK1. The duty cycle at the output latch in percentage is ___________.

The Miller effect in the context of a Common Emitter amplifier explains

Assertion (A): Sometimes a quarter wave line is called as impedance inverter.
Reason (R): The quarter wavelength line transforms a load impedance Z_R that is smaller than Z₀ into a value Z_s that is larger than Z₀ and vice-versa.

The simplest form of a cluster is ______ approach.

The biggest disadvantages of PCM is

The probability of an electron being thermally promoted to the conduction band in Si(∈_g=1.107 eV) at room temperature (25°C)?

The capacity of a memory chip is 8192 bits and it has 2048 rows. Then the organisation of the chip is

In circuit given if both Transistors have same VT what is the approximate value of highest possible output voltage vout if v_h, can range from 0 to V_DD, it is assumed that 0 < v_T < V_DD

A region of negative differential resistance is observed in the current voltage characteristics
of a silicon PN junction if