Practice Test: Electronics Engineering (ECE)- 12

The wrong (misfit) number of the sequence 36, 81, 144, 225, 256, 441 is

Direction: Read the pie chart given below and answer the following questions-

The pie chart given shows the population of India in the 7 states considering there is no other states apart from these.

How much percent more is the population of UP than that of Odisha?

Direction: In the following question, choose the word opposite in meaning to the given word as your answer.

Drought

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

P is standing north of Q at a distance of 6m. R is standing toward east of P at a distance of 6m. R is to the north of S and distance between them is 6m. P is facing north direction, R is facing east, S is facing North and Q is facing towards west direction. All of them walk straight for 3m.

What is the distance between the final position of P and Q?

In the following question, a statement has been given followed by two arguments numbered I and II. Based on the argument, you have to decide which of the following argument is strong and which is a weak argument.

Statement: Shiva trilogy written by Amish Tripathi is the best fiction book.

Arguments

I. Yes, None other fiction books have three parts.

II. No, the best fiction book is subjective and it always differs from person to person.

A year after the deadliest Ebola outbreak ever in Africa, the virus has resurfaced in Congo this time around. It is not clear yet how the first victim—a man who has since died—caught the virus. But this outbreak is not the first in Congo; the country has suffered seven prior epidemics of the virus since 1976.

Which of the following is a conclusion that can be drawn from the above paragraph?

Direction: Following bar graphs shows time taken by different pipes to fill that particular percentage of tank which is described in tabular data. For Ex- Pipe 1 fills the 10 % of tank in 6 mins.

Now, read the following data and answer the question carefully:

A Tank has three pipes; two of them are used to fil the tank while another one used to empty the tank namely: pipe 3, pipe 5 to fill the tank and a new third pipe for making the tank empty. When all three pipes are open, 7/18th part of the tank is filled in 1 hours. What is the ratio of the efficiency of Pipe-3: Pipe 5: all three pipes working together.

Find the unit normal vector of the cone of revolution z² = 9x² + 15y² at a point (1,0,3)

Minimum of real value function f(x) = (x−1)^2/5 occurs at x equal to

The transfer function of a system is 10/(s² + 2s + 10). Find the nature of the given system.

In a transistor circuit , I_CO = I_CBO = 2μA , also it is given that α = 0.98

Then the value of I_CEO is _______(μA).

There are two energy levels E₁ and E₂. E₁ is E eV above the fermi level and E₂ is E eV below the fermi level.

P₁ = the probability of E₁ being occupied by an electron.

P₂ = the probability of E₂ being empty.

Then, which of the following is correct?

Match List I (Regions of Bipolar Transistor in a Monolithic IC) with list II (Physical Properties)

List I

a) Emitter

b) Base

c) Collector

d) Substrate

List II

(1) Moderate resistivity

(2) Very high resistivity

(3) Large size

(4) Very high Conductivity

Select the correct answers from the following.

Consider the circuit shown in the figure below

v(t) = 80e^−1000tV ;t>0

i(t) = 5e^−1000tmA ;t>0

the energy dissipated (in μ) by the resistor for 0 < t="" />< 0.6="" ms="" will="" be="" />

A practical voltage source consists of:

While analysing a two-port network, which of the following parameters are obtained when one-port variables are expressed in terms of the other port variables?

Consider the following sentences regarding a periodic signal

a) A periodic signal always repeats itself after minimum fundamental time period T.

b) A periodic signal is exist from -∞ to +∞ and converse is also true.

c) A periodic signal exist from -∞ to +∞.

Which of the following is/are correct option?

The impulse response of a second order under damped system starting from rest is given by

C(t) = 12.5e^-8tcos 6t

What are the responsive value of natural frequency and damping ratio of the system?

If x(t) = δ(2t/3), what will be its amplitude at t = 0?

For the CE amplifier shown, calculate value of lower cutoff frequency F_L (in Hz) due to C₂

In the given figure, β = 100, the magnitude of voltage gain (V₀/V_in) will be ___

Calculate the hysteresis width (in Volts) for an inverting Schmitt trigger with feedback fraction 0.5. Assume the supply voltage to be 1

For a given sample-and-hold circuit, if the value of the hold capacitor is increased, then

The amplitude of a random signal is uniformly distributed between -5 V and 5 V.

If the signal to quantization noise ratio required in uniformly quantizing the signal is 43.5 dB, the step size (in V) of the quantization is approximately

The Potential (scalar) distribution in free space is given as V = 10y⁴ + 20x³. if ε₀ is permittivity of free space then the charge density ρ at the point (2,0) is

For a telephone line, β = 0.02rad/km. If frequency is 1 kHz. Calculate time taken to travel 3.14 km by the wave in

Consider an air-filled rectangular waveguide with inside dimensions 5 cm x 2cm. If the wave impedance is 222.24 Ω for TM₁₁ mode of propagation. Then the operating frequency (in GHz)is given by

A 1MHz uniform plane wave propagates through fresh water for which σ = 0, μ_r = 1,ε_r = Calculate wavelength in meters.

Which of the following is correct for 1110100 ÷ 1010?

Which of the following coding scheme is most suitable for coding the successive positions in 8-position digital shaft encoder?

12 signal each band-limited to 5 KHz are to be transmitted over a single channel by freq. division multiplexing. If AM-SSNB modulated guard band of 1 KHz is used, then the bandwidth of the multiplexed signal will be

ln INTEL 8085, suppose the peripheral mapped l/O has address length of M and memory mapped l/O address length of N. Then M+N =_______.

Find the bandwidth (in rad/s) of a parallel GLC resonant circuit whose transfer function is

A 70 kHz bandwidth is to accommodate 7 AM broadcast signals simultaneously. The maximum modulation frequency must each station be limited to _____ kHz. Assume that a guard band of 5 kHz is also present.

A carrier frequency modulated with a sinusoidal signal of frequency 4 kHz resulting in a maximum frequency deviation of 7kHz. The bandwidth of the modulated signal is

Consider two real valued signals, x(t) band-limited to [−500 Hz, 500Hz] and y(t) bandlimited to [−1kHz, 1kHz]. For z (t) = x(t). y(t), the Nyquist sampling frequency (in kHz) is __________

The laplace transform of a signal x(t) is

then the value of ∅ in degrees is

A sinusoidal oscillator is built using an amplifier of real gain A, infinite input impedance and the feedback(β) network as shown in the figure.

If Z = jX then Z₀ is equal to

Consider the three transistor current source in figure below. Assume all transistor are matched with finite gain and early voltage V_A = ∞. The expression for I₀ is

Two 4-ray signal constellations are shown. It is given that ϕ₁ and ϕ₂ constitute an orthonormal basis for the two constellations. Assume that the four symbols in both the constellations are equiprobable. Let N₀/2 denote the power spectral density of white Gaussian noise.

The ratio of the average energy of Constellation 1 to the average energy of Constellation 2 is:

In an analogue cellular system, find the number of channels when total spectrum allocation (Bt) is 12.5 MHz per simplex band with guard band (Bguard) as 10 kHz having channel bandwidth (Bc) as 30 kHz.

In synchronous TDM, there are four inputs and data rate of each input connection is 3 kbps. If 1 bit at a time is multiplexed, what is the duration of each frame?

A specimen of a Si has a resistivity of 200 Ωk-cm , magnetic flux B = 0.3 Wb/m² and d = w = 6mm. if the value of hall voltages and hall currents are 60mV and 10 μA. Then the value of μ_p is ______(cm²/V-sec)

Silicon is doped with boron to a concentration of 4 × 10¹⁷ atoms/cm³. Assuming the intrinsic carrier concentration of silicon to be 1.5×10¹⁰/cm³ and the value of kT/q to be 25 mV at 300 K

Compared to undoped silicon, the Fermi level of doped silicon?

The transmission line shown in figure is 40 m long and has V_g = 15ÃO^o V_rms, Z_o = 30 + j 60W and V_L = 5 Ö48^o V_rms. If the line is matched to the load, then the magnitude of sending – end current I_in is

Consider the following synchronous counter made up of JK, D and T flip-flops.

Find the modulus value of the counter.

Consider the following k-map, P, Q, R are don’t cares. What should be the values of P, Q, R in order to get the minimized SOP expression?

An antenna consist of 4 identical Hertzian dipoles located along z-axis uniformly with λ/8 space apart.

The group pattern function is_________?

The maximum phase lag provided by the given lag compensator is?

Find the particular integral of

(D² – 4D +4) y = e^2x sinx cosx

For a transmission line at frequency of 300 MHz. We have, first maxima occurs at 1/8 m from the load. Z_L = jR_L , Where R_L = k.R₀ and R₀ = characteristic impedance of line.

Then k = _________? (positive value of k)

A signal m(t) is shown

This signal is applied to both phase modulator (with k_p as phase constant) and frequency modulator (with K_f as frequency constant).

The ratio of k_f/k_p for same maximum phase deviation is _______?

Calculate the drift velocity of free electrons in a conductor of cross-section area of 10^-4 m² and current of 400 A is flowing through it, assuming free electron density of conductor to be 9 × 10²⁸ m^-3.

The inverse z-transform of the signal x(z) = log(1 + z^–1) |z| > 1 is?

The input voltage V_i/P is 5 + 4sinωt. Assume diode is ideal. Then the average value of output voltage is?

A die is rolled ‘n’ times until 4 appears then the probability that die must rolled more than 5 times before getting a “4”,

For a p-n-p BJT with emitter doping concentration of 10¹⁷ / cm³, Base doping of 5 x 10¹⁵ / cm³ and collector doping of 3 x 10¹⁴ /cm³. Then under no external voltage V_CE is ___ volt?

The value of the Integral is (accurate upto 3 decimal place)

The open-loop transfer function unity feedback system is given by

The breakaway point of the root locus plot is given by

An antenna a power input of 50 π watt and an efficiency of 90%.

The radiation intensity has been found to have a 6-maximum value of 140W per solid angle.

The directivity of antenna is ____________.

Power across 20 Ω resistor is 10 watt. Then the power factor of the coil for the given connection is _____

For given code executed in 8085 μp After the PSW value is?

MVI A, 63H

ORA A

ANI 36 H

DAA