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Practice Test: Electronics Engineering (ECE)- 12 - Question 1

Which of the following states the meaning of the idiom ‘**Into the bargain**’?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 1

Practice Test: Electronics Engineering (ECE)- 12 - Question 2

Direction: Find the correct relationship between the given quantities-

**Quantity I: **Let E be the set of all integers with 6 in their unit place. The probability that a number chosen from the set {10, 11, 12, ........59} is a member of E is?

**Quantity II:** A boy speaks truth in 70% of cases while another boy speaks truth in 65% cases. The probability that they will contradict each other on stating the same fact is?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 2

Practice Test: Electronics Engineering (ECE)- 12 - Question 3

A square metallic sheet of an area of 1296 square cm is used for making the toys. For taking the metallic sheet from that square – four equal sized of the circular plates have been cut –off. If a fencing with the Silver thread is required to make the base of toys, how many rolls of the thread is required, if a roll contains 30 cm of the thread only?

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Practice Test: Electronics Engineering (ECE)- 12 - Question 4

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 4

Practice Test: Electronics Engineering (ECE)- 12 - Question 5

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?**

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 5

Practice Test: Electronics Engineering (ECE)- 12 - Question 6

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

Drought

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 6

Practice Test: Electronics Engineering (ECE)- 12 - Question 7

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?**

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 7

Practice Test: Electronics Engineering (ECE)- 12 - Question 8

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.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 8

Practice Test: Electronics Engineering (ECE)- 12 - Question 9

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?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 9

Practice Test: Electronics Engineering (ECE)- 12 - Question 10

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.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 10

Practice Test: Electronics Engineering (ECE)- 12 - Question 11

Find the unit normal vector of the cone of revolution z^{2} = 9x^{2 }+ 15y^{2} at a point (1,0,3)

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Practice Test: Electronics Engineering (ECE)- 12 - Question 12

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 12

Practice Test: Electronics Engineering (ECE)- 12 - Question 13

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 13

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 14

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).

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 14

Practice Test: Electronics Engineering (ECE)- 12 - Question 15

There are two energy levels E_{1} and E_{2}. E_{1} is E eV above the fermi level and E_{2} is E eV below the fermi level.

P_{1} = the probability of E_{1} being occupied by an electron.

P_{2} = the probability of E_{2} being empty.

Then, which of the following is correct?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 15

Practice Test: Electronics Engineering (ECE)- 12 - Question 16

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.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 16

Practice Test: Electronics Engineering (ECE)- 12 - Question 17

Consider the circuit shown in the figure below

v(t) = 80e^{−1000t}V ;t>0

i(t) = 5e^{−1000t}mA ;t>0

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 17

Practice Test: Electronics Engineering (ECE)- 12 - Question 18

A practical voltage source consists of:

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 18

Practice Test: Electronics Engineering (ECE)- 12 - Question 19

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?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 19

Practice Test: Electronics Engineering (ECE)- 12 - Question 20

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?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 20

Practice Test: Electronics Engineering (ECE)- 12 - Question 21

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

C(t) = 12.5e^{-8t}cos 6t

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 21

Practice Test: Electronics Engineering (ECE)- 12 - Question 22

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 22

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 23

For the CE amplifier shown, calculate value of lower cutoff frequency F_{L} (in Hz) due to C_{2}

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Practice Test: Electronics Engineering (ECE)- 12 - Question 24

In the given figure, β = 100, the magnitude of voltage gain (V_{0}/V_{in}) will be ___

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Practice Test: Electronics Engineering (ECE)- 12 - Question 25

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 25

Practice Test: Electronics Engineering (ECE)- 12 - Question 26

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 26

Practice Test: Electronics Engineering (ECE)- 12 - Question 27

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 27

Practice Test: Electronics Engineering (ECE)- 12 - Question 28

The Potential (scalar) distribution in free space is given as V = 10y^{4} + 20x^{3}. if ε_{0} is permittivity of free space then the charge density ρ at the point (2,0) is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 28

Practice Test: Electronics Engineering (ECE)- 12 - Question 29

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 29

Practice Test: Electronics Engineering (ECE)- 12 - Question 30

Consider an air-filled rectangular waveguide with inside dimensions 5 cm x 2cm. If the wave impedance is 222.24 Ω for TM_{11} mode of propagation. Then the operating frequency (in GHz)is given by

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 30

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 31

A 1MHz uniform plane wave propagates through fresh water for which σ = 0, μ_{r} = 1,ε_{r} = Calculate wavelength in meters.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 31

Practice Test: Electronics Engineering (ECE)- 12 - Question 32

Which of the following is correct for 1110100 ÷ 1010?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 32

Practice Test: Electronics Engineering (ECE)- 12 - Question 33

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 33

Practice Test: Electronics Engineering (ECE)- 12 - Question 34

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 34

Practice Test: Electronics Engineering (ECE)- 12 - Question 35

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 =_______.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 35

Practice Test: Electronics Engineering (ECE)- 12 - Question 36

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 36

Practice Test: Electronics Engineering (ECE)- 12 - Question 37

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.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 37

Practice Test: Electronics Engineering (ECE)- 12 - Question 38

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 38

Practice Test: Electronics Engineering (ECE)- 12 - Question 39

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 __________

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 39

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 40

The laplace transform of a signal x(t) is

then the value of ∅ in degrees is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 40

Practice Test: Electronics Engineering (ECE)- 12 - Question 41

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 Z_{0} is equal to

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 41

Practice Test: Electronics Engineering (ECE)- 12 - Question 42

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 I_{0} is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 42

Practice Test: Electronics Engineering (ECE)- 12 - Question 43

Two 4-ray signal constellations are shown. It is given that ϕ_{1} and ϕ_{2} constitute an orthonormal basis for the two constellations. Assume that the four symbols in both the constellations are equiprobable. Let N_{0}/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:

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 43

Practice Test: Electronics Engineering (ECE)- 12 - Question 44

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.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 44

Practice Test: Electronics Engineering (ECE)- 12 - Question 45

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?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 45

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Practice Test: Electronics Engineering (ECE)- 12 - Question 46

A specimen of a Si has a resistivity of 200 Ωk-cm , magnetic flux B = 0.3 Wb/m^{2} 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 ______(cm^{2}/V-sec)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 46

Practice Test: Electronics Engineering (ECE)- 12 - Question 47

Silicon is doped with boron to a concentration of 4 × 10^{17} atoms/cm^{3}. Assuming the intrinsic carrier concentration of silicon to be 1.5×10^{10}/cm^{3} and the value of kT/q to be 25 mV at 300 K

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 47

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Practice Test: Electronics Engineering (ECE)- 12 - Question 48

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 Ã–48^{o} V_{rms}. If the line is matched to the load, then the magnitude of sending – end current I_{in} is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 48

Practice Test: Electronics Engineering (ECE)- 12 - Question 49

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

Find the modulus value of the counter.

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Practice Test: Electronics Engineering (ECE)- 12 - Question 50

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?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 50

Practice Test: Electronics Engineering (ECE)- 12 - Question 51

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

The group pattern function is_________?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 51

Practice Test: Electronics Engineering (ECE)- 12 - Question 52

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 52

Practice Test: Electronics Engineering (ECE)- 12 - Question 53

Find the particular integral of

(D^{2} – 4D +4) y = e^{2x} sinx cosx

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 53

Practice Test: Electronics Engineering (ECE)- 12 - Question 54

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.R_{0} and R_{0} = characteristic impedance of line.

Then k = _________? (positive value of k)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 54

Practice Test: Electronics Engineering (ECE)- 12 - Question 55

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 _______?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 55

Practice Test: Electronics Engineering (ECE)- 12 - Question 56

Calculate the drift velocity of free electrons in a conductor of cross-section area of 10^{-4} m^{2} and current of 400 A is flowing through it, assuming free electron density of conductor to be 9 × 10^{28} m^{-3}.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 56

Practice Test: Electronics Engineering (ECE)- 12 - Question 57

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

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Practice Test: Electronics Engineering (ECE)- 12 - Question 58

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 58

Practice Test: Electronics Engineering (ECE)- 12 - Question 59

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 59

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 60

For a p-n-p BJT with emitter doping concentration of 10^{17} / cm^{3}, Base doping of 5 x 10^{15} / cm^{3} and collector doping of 3 x 10^{14} /cm^{3}. Then under no external voltage V_{CE} is ___ volt?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 60

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 61

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 61

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 62

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

The breakaway point of the root locus plot is given by

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 62

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Practice Test: Electronics Engineering (ECE)- 12 - Question 63

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 ____________.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 63

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 12 - Question 64

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

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 64

Practice Test: Electronics Engineering (ECE)- 12 - Question 65

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

MVI A, 63H

ORA A

ANI 36 H

DAA

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 12 - Question 65

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