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Practice Test: Electronics Engineering (ECE)- 14 - Question 1

A invest 1/3 part of the capital for 1/6 of the time, B invest 1/4 part of the capital for 1/2 of the time and C invest rest of the capital for rest of the time. Out of a profit of Rs. 23000, B’s share is?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 1

Practice Test: Electronics Engineering (ECE)- 14 - Question 2

Pipe A can fill a tank three times as fast as pipe B. If together two pipes can fill the tank in 48 min, the slower pipe alone will be able to fill the tank in:

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 2

Practice Test: Electronics Engineering (ECE)- 14 - Question 3

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

Gratuitous

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 3

Practice Test: Electronics Engineering (ECE)- 14 - Question 4

Find the area bounded between parabola and the line y^{2} = x,y = 2.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 4

Practice Test: Electronics Engineering (ECE)- 14 - Question 5

The bar graph shows the number of employees working under the six different Departments (A, B, C, D, E, F) of a certain company. Study the diagram and answer the following questions.

If departments F and D are merged to create a new department G, then which department will have the least number of employees?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 5

Practice Test: Electronics Engineering (ECE)- 14 - Question 6

In the following question, a sentence is given with a blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option.

Confusion prevails in madrasas in Uttar Pradesh over the distribution of free NCERT textbooks as the academic session ____________ from August.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 6

Practice Test: Electronics Engineering (ECE)- 14 - Question 7

A sum of Rs.400 amounts to Rs.480 in 4 years. What will it amount to if the rate of interest is increased by 2 % for the same time?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 7

Practice Test: Electronics Engineering (ECE)- 14 - Question 8

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: The Information and Broadcasting Ministry plans to conduct an independent study to gauge the impact of government advertisements on people.

Q: The advertisements are carried on various platforms, including print and visual media.

R: The Directorate of Advertising and Visual Publicity (DAVP) is the nodal agency of the government for advertising on behalf of the various ministries.

S: The initiative comes ahead of the Lok Sabha election in 2019 for which the government is expected to reach out to the people and highlight the works done by it in the past 4 years.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 8

Practice Test: Electronics Engineering (ECE)- 14 - Question 9

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If the sentence is free from error, select 'No error'.

The gold foil used liberal (1)/ in Thanjavur paintings serves (2)/ many objectives that makes the painting more attractive. (3)/ No error

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 9

Practice Test: Electronics Engineering (ECE)- 14 - Question 10

A, B and C can do a job in 6 days, 12 days and 15 days respectively. C works till 1/8 of the work is completed and then leaves. Rest of the work is done by A and B together. Time taken to finish the remaining work by A & B together is how much?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 10

Practice Test: Electronics Engineering (ECE)- 14 - Question 11

Given a network with values of components depicted in the figure.

Find the sum of current through 5Ω and 4Ω resistor.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 11

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

The number of possible distinct Boolean expression of 3 variables will be ___________.

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

Practice Test: Electronics Engineering (ECE)- 14 - Question 13

Given the following system

T{X[n]} = X[n] + 3u[n+1]

Where u[x] represents unit step functions-

Which of the following is a correct representation of the system?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 13

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

Consider the following sentences regarding a constant signal.

1) A constant signal is a periodic signal because it has no fundamental period.

2) A constant signal is an anti periodic signal because it never repeats itself.

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

Practice Test: Electronics Engineering (ECE)- 14 - Question 15

List-1 (pole location) with list-2(shown constant amplitude with impulse response).

Select the correct answer using the codes given below.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 15

Practice Test: Electronics Engineering (ECE)- 14 - Question 16

In the root locus for open loop transfer function is the ‘break away/in points are located at

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 16

Practice Test: Electronics Engineering (ECE)- 14 - Question 17

In a PCM system, if the code word length is increased from 6 to 8 bits, the signal to quantization noise ratio improves by the factor

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 17

Practice Test: Electronics Engineering (ECE)- 14 - Question 18

The op-amp configuration shown below has following transfer function The feedback resistance used has 1.5 MΩ , the value of capacitance will be ___________ µf.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 18

Practice Test: Electronics Engineering (ECE)- 14 - Question 19

A semiconductor sample at room temperature has intrinsic concentration of 2.5 X 10^{17} /m^{3}. After doping what will be the minority carrier concentration if the majority carrier concentration is given as 5.5 X 10^{21} /m^{3}.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 19

Practice Test: Electronics Engineering (ECE)- 14 - Question 20

An LED is connected as shown in figure. It should glow when V_{1} is at logic ‘0’ state (0.2V). Calculate R( in Ω). (Assume in active state current as 15 mA)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 20

Practice Test: Electronics Engineering (ECE)- 14 - Question 21

For an ideal p-channel MOSFET, μ_{p} = 300cm^{2}/v-s, W = 15μm, L = 1.5μm, t_{ox} = 300A, V_{t} = -0.7V. If the transistor is non-saturation region at V_{SD} = 0.5V, then what is the Transconductance _{gm}?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 21

Practice Test: Electronics Engineering (ECE)- 14 - Question 22

In the circuit shown below express the current I_{0} in terms of V_{i}

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 22

Practice Test: Electronics Engineering (ECE)- 14 - Question 23

From the circuit given below, find out the operating region of the transistors T_{1} and T_{2}

(V_{TH} = -0.4)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 23

Practice Test: Electronics Engineering (ECE)- 14 - Question 24

In the circuit shown below, assume that the voltage drop across a forward biased diode is 0.7 V. The thermal voltage V_{1} = kT/q = 25 mV. The small signal input V_{i} = V_{p} cos(ωt) where V_{p} = 100 mV.

The bias current I_{DC} through the diodes is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 24

Practice Test: Electronics Engineering (ECE)- 14 - Question 25

A communication channel having AWGN characteristics is operating in such a way that SNR >> 1. The bandwidth of signal being transmitted is B and capacity C_{1}. Determine the capacity of channel if a signal with half the bandwidth is transmitted through the same channel with same quality.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 25

Practice Test: Electronics Engineering (ECE)- 14 - Question 26

A three stage amplifier with identical stages with lower cut-off frequency per stage 'f_{1}' is given overall negative feedback. Depending on the overall gain, the system may oscillate at a low frequency f_{c} given by

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 26

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 14 - Question 27

Consider the differential equation 3y^{n}(x) + 27y(x) = 0 with initial conditions y(0) = 0 and y'(0) = 2000. The value of y at x = 1 is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 27

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 14 - Question 28

Let z be a complex variable. For a counter-clockwise integration around a unit circle C, centred at origin, the value of A is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 28

Practice Test: Electronics Engineering (ECE)- 14 - Question 29

In the given circuit, the equivalent impedance of the circuit between terminals A-B is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 29

Practice Test: Electronics Engineering (ECE)- 14 - Question 30

The ROCs of different impulse responses are shown below. Which of the following impulse responses are stable?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 30

Practice Test: Electronics Engineering (ECE)- 14 - Question 31

The current mirror circuit acts as a _________.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 31

Practice Test: Electronics Engineering (ECE)- 14 - Question 32

The given signal is the sum of two-real exponentials:

What will be the region of convergence (ROC) in this case?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 32

Practice Test: Electronics Engineering (ECE)- 14 - Question 33

In the circuit given below, if current through the resistance R is given by I = 1 + 5 cos 2t , then find the value of R.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 33

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 14 - Question 34

A ‘dual slope integrating type’ A to D converter, converts analog voltage of 15 volt to (11001010)_{2}. If the clock frequency is 2 MHz, the total conversion time is _______ μsec.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 34

Practice Test: Electronics Engineering (ECE)- 14 - Question 35

The open loop transfer function of a unity negative feedback control system is given by

Find the value of K for the phase margin of the system to be 45^{0} is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 35

Practice Test: Electronics Engineering (ECE)- 14 - Question 36

Consider a binary channel shown below, the value of P(Y_{1}) and P(Y_{2}), if P(X_{1}) and P(X_{2}) are 0.3 and 0.7 respectively are

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 36

Practice Test: Electronics Engineering (ECE)- 14 - Question 37

The random process Z(t) is defined as Z(t) = X +Y; where X and Y are independent random variables. X is uniformly distributed on (-1, 1) and Y is uniformly distributed on (0, 1)

The auto correlation function of Z(t) is R_{z} (0) is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 37

Practice Test: Electronics Engineering (ECE)- 14 - Question 38

Consider the following program for an INTEL 8085 microprocessor

1) MVI A, 92 H

2) ORA A

3) JP PORT

4) XRI 66 H

5) PORT OUT F2 H

6) HLT

The content of output port F2 H after execution of the program is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 38

Practice Test: Electronics Engineering (ECE)- 14 - Question 39

Consider a GaAs sample at T = 300 K. Let the Hall effect device is fabricated with the following geometry: d = 0.01cm, W = 0.05 cm and L = 0.5 cm. The electrical parameters are : I_{x} = 2.5 mA, V_{x} = 2.2 V and Bz = 2.5 × 10^{-2} tesla. The hall voltage is V_{H} = -4.5 mV. What will be the resistivity of the sample?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 39

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Practice Test: Electronics Engineering (ECE)- 14 - Question 40

Consider an abrupt PN junction (at T = 300 K) shown in the figure. The depletion region width X_{n} on the N-side of the junction is 0.2 μm and the permittivity of silicon (ε_{si}) is 1.044 x 10^{-12} F/cm At the junction, the approximate value of the peak electric field (in kV/cm) is _________.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 40

Practice Test: Electronics Engineering (ECE)- 14 - Question 41

Given an arrangement of memories

1) 8 kB ROM

2) 8 kB RAM – 1

3) 4 kB RAM -2

4) Free space of memory of 4 KB after ROM.

Then the value of chip select (active low) for RAM-2 is ________?.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 41

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Practice Test: Electronics Engineering (ECE)- 14 - Question 42

For an abrupt p-n junction diode, the doping concentrations on p-side is 9 × 10^{16} cm^{3} and an n-side is 5 × 10^{16}/cm^{3}. The diode is in reverse bias operating mode with total depletion width of 4 μm. Then the depletion width on n-side is __________ μm.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 42

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Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 43

Practice Test: Electronics Engineering (ECE)- 14 - Question 44

The input impedance of lossless λ/8 transmission line with other end short circuited is given by ______. (Assume characteristic impedance Zo = 50Ω)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 44

Practice Test: Electronics Engineering (ECE)- 14 - Question 45

For a certain number system (51/4)_{b} = (13)_{b} is true

Then b is:

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 45

Practice Test: Electronics Engineering (ECE)- 14 - Question 46

Following system of equation has

4x + 5y + 9z = 4

2x + y + 3z = 2

X + 2y + 3z = 1

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 46

Practice Test: Electronics Engineering (ECE)- 14 - Question 47

A 400W, 220V bulb is supplied with 110V; then the power consumed by the bulb will be____?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 47

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Practice Test: Electronics Engineering (ECE)- 14 - Question 48

For the PNP transistor circuit, given R_{B} = 500kΩ, V_{CC} = 12 volt, I_{CBO} = 18 μA, β = 60. The value of I_{CQ} = ____ mA?

(Assume |V_{BE}| = 0.7 V)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 48

Practice Test: Electronics Engineering (ECE)- 14 - Question 49

A waveform of second derivative of a certain signal is shown below.

The Fourier transform of given signal f(t) is.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 49

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Practice Test: Electronics Engineering (ECE)- 14 - Question 50

For the signal

The ratio of power content in 1st harmonics and 8th harmonics is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 50

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Practice Test: Electronics Engineering (ECE)- 14 - Question 51

Let Q√γ be the BER of a BPSK system over an AWGN channel with two-sided noise power spectral density N_{0}/2. The parameter γ is a function of bit energy and noise power spectral density.

A system with two independent and identical AWGN channels with noise power spectral density N_{0}/2 is shown in the figure. The BPSK demodulator receives the sum of outputs of both the channels.

If the BER of this system is Q b√_{γ}, then the value of b is _____________.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 51

Practice Test: Electronics Engineering (ECE)- 14 - Question 52

An LTI system with transfer function H(f) is to be obtained in such a manner that it can generate a random signal x(t) having autocorrelation function R_{x}(τ) = 3ɳe^{-3|τ|}, by passing white noise n(t) having PSD S_{n}(f) = ɳ/2 watts/Hz. What would be the suitable transfer function H(f)?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 52

Practice Test: Electronics Engineering (ECE)- 14 - Question 53

A biliary symmetric channel (BSC) has a transition probability of 1/8. If the binary transmit symbol X is such that P(X = 0) = 9/10, then the probability of error for an optimum receiver will be

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 53

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Practice Test: Electronics Engineering (ECE)- 14 - Question 54

If an electric field is given as:

Determine the work (in nJ) that is to be done in moving a 3μC charge along this path if the path is located at P(-0.3, -4, 0.6).

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 54

Practice Test: Electronics Engineering (ECE)- 14 - Question 55

A 15 A source is operating at 100 MHz and feeds a Hertzian dipole of length 6mm situated at origin of space, determine electric field at P (4, 30^{0}, 90^{0})

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 55

Practice Test: Electronics Engineering (ECE)- 14 - Question 56

In SSB modulation system, if signal (cos 30t) is modulated with a carrier signal of frequency 850 rad /sec, then the expression for the lower side band is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 56

Practice Test: Electronics Engineering (ECE)- 14 - Question 57

The divide by N counter is shown below. If initially Q_{0} = 0, Q_{1} = 1, Q_{2} = 0 the value of N is _______.

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 57

Practice Test: Electronics Engineering (ECE)- 14 - Question 58

The logic function implemented by the circuit given below is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 58

Practice Test: Electronics Engineering (ECE)- 14 - Question 59

Consider following connection to the memory

The accessible range of address from memory is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 59

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 14 - Question 60

A box contains 2 identical bags A and B . Bag A contains 2 Red and 5 Green balls. Bag B contains 2 Red and 6 Green Balls. A person draws a ball at random. If the drawn ball was Red what is the probability that it was from bag A?

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 60

Practice Test: Electronics Engineering (ECE)- 14 - Question 61

An intrinsic semiconductor bar of Si is doped with donor type impurity to the extent of 1 atom per 10^{8} silicon atoms, then the resistivity of silicon crystal will be (atomic density of Si crystals =5 × 10^{22} atoms /cm^{3} and μ_{n} = 1300cm^{2}N − sec)

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 61

Practice Test: Electronics Engineering (ECE)- 14 - Question 62

The system of equations x - 4y + 7z = 12 , 3x + 8y - 2z = 10, 26 z - 8y = 6

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 62

Practice Test: Electronics Engineering (ECE)- 14 - Question 63

(D^{2 }− 5D + 6)y = e^{x }cos x is a Partial differential equation whose solution is given by

y = C_{1}e^{2x }+ C_{2}e^{3x }− Ke^{x}(3sin2x + cos2x)

The value of K is

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 63

Practice Test: Electronics Engineering (ECE)- 14 - Question 64

Evaluate using Simpson’s ⅓ rd rule. Using h = 0.5

Detailed Solution for Practice Test: Electronics Engineering (ECE)- 14 - Question 64

*Answer can only contain numeric values

Practice Test: Electronics Engineering (ECE)- 14 - Question 65

In a certain animal husbandry weight of animals had a distribution as shown in table below:

Mean weight of animals in the husbandry is______.

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