Practice Test: Electronics Engineering (ECE)- 2 - Electronics and Communication Engineering (ECE)

In the following question, out of the four alternatives, select the word opposite in meaning to the given word.

Turgid

Direction: Study the following information carefully and answer the given questions:

The following pie chart shows the percentage distribution of total number of Apples (Dry + Wet) sold in different days of a week :

The pie chart 2 shows the percentage distribution of total number of Apples (Wet) sold in different days of a week.

Find the ratio of Apples (Dry + Wet) sold on Tuesday to that of the Apples (Wet) sold on Thursday?

Directions: In each of the questions below, some statements are given followed by some conclusions. You have to consider the statements to be true even if they seem to be at variance with commonly known facts. You have to decide which of the following conclusions logically follows from the given statements. Give answer.

Statements:

Some jacket is shirt.

Some shirts are trouser.

No shoes are t-shirt.

All trousers are shoes.

All pants are t-shirt.

Conclusions:

I. All shirts being t-shirt is a possibility.

II. Some shoes are trouser.

III. Some jackets are t-shirt.

IV. Some shirts being t-shirt is a possibility.

The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options.

P: July 1969 was to see a transformed Indira Gandhi.

Q: Quite a few people contributed with ideas.

R: She sounded the bugle through her historic ‘Note on Economic Policy and Programme’ that was circulated among delegates at Bangalore on July 9, 1969.

S: But the pivot was P.N.Haksar who gave shape, structure and substance with the help of some of his colleagues in the Prime Minister’s Secretariat.

Direction: Which of the following is the MOST SIMILAR in meaning to the given word?

Remnant

Direction: Read the information carefully and give the answer of the following questions:

Total number of children = 2000

If two-ninths of the children who play football are females, then the number of male football children is approximately what percent of the total number of children who play cricket?

Direction: Study the following information carefully and answer the given questions.

Seven people, P, Q, R, S, T, W and X sitting in a straight line facing north, not necessarily in the same order. R sits at one of the extreme ends of the line. T has as many people sitting on his right, as on his left. S sits third to the left of X. Q sits on the immediate left of W. Q does not sit at any of the extreme ends of the line.

If all the people are made to sit in alphabetical order from right to left, the positions of how many people will remain unchanged?

The figure shows the circuit of a gate in the resistor transistor logic (RTL) Then the circuit represent which gate?

For the given p+ -n junction diode the minority carrier life time in the n -region is Υ_P = 1.1 μsec. If the excess minority charges present in the n -region at any time t is given as Q_P(t) then Q_P(t) at t = 1.5 μsec is _____ μC?

For the given network, the power given to the load is ____ kW? [Assume R =1 Ω and ideal diode]

V = 100. sinωt

A current source with an internal resistance of R_S, supplied power to load R_L. The plot of power delivered as a function of load R_L is?

where (x) denotes greatest integer

For given system

Angle of arrival is?

A system is shown in figure as follows

Where, h_k (n) = δ [n – k.(1/2)^k]

Then value of overall impulse response of above system h(n) at h = 2 is ______?

A square wave with frequency = 5 kHz

This signal is passed through an ideal low-pass filter with 0 dB of passband gain and 10 kHz of cut-off frequency. The filtered signal is subsequently buried additively into a zero-mean noise processed with one-sided power spectral density (PSD) of 20 nW Hz^–1. Upto a frequency of 2.5 MHz. The PSD of noise is zero beyond 2.5 MHz. The signal to noise ratio of the output is _______dB.

The output of filter is a

For a MOD -30 ripple counter, the maximum operating frequency is 8 MHz. The propagation delay of each flip flop must be _________nsec?

For a successive approximation type of ADC shown.

If V_a = 8V and resolution of D/A = 0.25 volt

Then the error voltage between V_a and SAR output at 5^th clock is_______volt?

For the transfer function G(jω) = 6 + jω. The corresponding Nyquist plot for positive frequency has the form

Consider a random process as z(t) = x(t) + y(t)

Where x(t) and y(t) are two random processes with zero mean and they are individually WSS. The PSD of x(t) is S_x(f) and y(t) is S_y(f). Then PSD of z(t) is?

A digital circuit is designed in a way that it accept 3-bit number and generate it’s square. The circuit is to be designed using ROM with minimum hardware. Then the size of ROM is _______?

Eight voice signals, each limited to 4 kHz and sampled at Nyquist rate, are converted into binary PCM signal using 256 quantization levels. The bit transmission rate for the time-division multiplexed signal will be (in kbps)____

When a relatively small d.c. voltage is applied across a thin slice of Gallium Arsenide with thickness of order of few tenths of a micrometer and the voltage gradient across the slice is in excess of about 3300 V/cm, then the negative resistance will manifest itself. Which of the following devices operate based on the above phenomenon?

A signal of bandwidth 100 MHz and strength 10mW is transmitted through a transmitter through a cable that has 40 dB loss. If N₀/2 = 0.5 × 10⁻²⁰ω/Hz then the signal to noise ratio at the input of the receiver is

In a superheterodyne AM receiver, the image channel selectivity is determined by :

Consider a medium such that μ=μ₀,ε = 81ε₀,σ = 20S/m. The frequency at which the conduction current density is 10 times the displacement current density in magnitude is ____(GHz)

A 78 Ω lossless planar line was designed but did not meet a requirement. The fraction of the widths of strip (in %)should be added or removed to get the characteristic impedance of 75Ω is ___

A 16K × 8 ROM IC is interfaced to 8085 microprocessor. What is the address space?

A 16 bit computer can address 1M word and has 128K words installed from 64K 1 chips. Calculate the no. of chips required and no. of bits of address bus that allows to select the memory chips

Maximum number of Self Dual possible for 4-variable function.

A minimized Boolean expression is a combination of

If then which of the following holds

Calculate the value of

If dt/dx = sin(t + x) + cos(t + x) then find out the value of t at x = π/3 correct upto 2 decimal places. It is given that t = π/2 at x = 0

A poisson variate satisfies P(x = 1) = 0.5 P(x = 2). Then find the value of P(x = 4) is

Find the general solution of the equation

A discrete time signal with input as x[n] has impulse response h[n]=kδ[n] where k is constant. The output y[n] of the system is given as:

Find the complete solution of the state equation given below

Given the initial condition as

For the given system, determine the overall response Y(s) of the system corresponding to both inputs.

An integral controller is used for speed control with a set-point of 120 rpm within a range of 100 to 150 rpm. The controller output is 22% initially. The constant KI for controller output is 0.15%/sec for unit percentage error. If the speed goes to 105 rpm, then the controller output after two seconds for a constant error e_p is (in %).

A junction diode is fabricated in which the p and n regions are doped equally with 5 × 10¹⁶ atoms/cm³. Assume n_i = 1.5 × 10¹⁰/cm³. If the cross-sectional area of the junction is 20 μm², the magnitude of the charge stored on either side of the junction while no external bias being applied would be – (Assume ∈s = 1.04 x 10-14 F/cm, V₀ (barrier potential) = 0.78V)

A thin P-type silicon sample is uniformly illuminated with light which generates excess carriers. The recombination rate is directly proportional to

Two ideal pn junction have exactly the same electrical and physical parameters except for the band gap of the semiconductor materials. The first has a bandgap energy of 0.525 eV and a forward-bias current of 10 mA with V_a = 0.255 V. The second pn junction diode is to be designed such that the diode current I = 10μA at a forward-bias voltage of V_a = 0.32 V. The bandgap energy of second diode would be_____ (eV)

Consider the given figure and calculate the feedback factor of the wave generator if R1 = 5kΩ, R2 = 20kΩ, R = 500Ω and C = 10 µF. Also calculate the one cycle period?

Calculate the hysteresis width (in Volts) for an inverting Schmitt trigger with feedback fraction 0.5. Assume the supply voltage to be 10V.

The combination of resistors is shown in figure below. If R₁ is operated at T and R₂ is operated at temperature (T+t) ,then the equivalent noise temperature if the circuit is

Decide the stability of the system whose characteristic equation is given by s⁵ + 2s⁴ + 5s³ + 10s² + 4s + 8 = 0

Consider the electronic PID controller shown in figure below

If R₁ = R₂ = R and C₁ = C₂ = C₂ = C, then find K_p, K_d and K_i

Two point charges of 10 µC at point M and 20 µC at point N exerts a force of 4.8 N and 10 N respectively on a point charge of 40 µC at point O. Determine the electric field intensity at point O.

An op-amp is used in a feedback configuration having open loop forward gain value of 50 as shown. The feedback gain is β in the circuit, the feedback circuit is given below. For which of the combination of R₁ and R₂ respectively would the configuration work as an oscillator?

Find the h parameters of the following circuit

The expression for unit tangent ∅ = e^2x casyz at the or igin at the or igin in the direction of the tangent to curve x = a sin t, y = a cos⁡ t,z = 2α sin ⁡t, at t = T/4

Root locus of 2s(s+4)+k(s+8) is a circle. The co-ordinates of the centre of the circle?

In the following table, x is a discrete random variable and p(x) is the probability density. The difference between the variance & the standard deviation is

Find the state transition diagram for the logic circuit shown below-

Consider the following circuit consisting of three D-flip flops.

If all the flip-flops were reset to 0 at power on, then the total number of different output states represented by the counter ABC is equal to-

Consider a silicon PN junction at T = 300K with current density 3.6 10^-11 A/cm². If the photocurrent density is 10 mA/cm². Then find the open-circuit voltage (in V) of a solar cell when the solar intensity is increased by a factor of

Assume thermal voltage V_T = 26 mV

DTFT of x(n) is X(ω). Hence x(n) = (0.5)ⁿu(n). Then the time signal corresponding to X²(ω) is

A varying magnetic flux linking a coil is φ=1/3 λt³. If the value of λ = −1Wb/s², then at what time the induced EMF is 9V?

Determine length of a cavity resonator(rectangular) if it has dimensions a = 3cm, b = 2cm, and is excited by TE₁₀₁ mode at 30GHz frequency.

If directive gain of a half-wave dipole is 2.64 W/W, and ohmic losses is 8Ω, then determine its power gain(in dB).