GATE Electronics And Communication Test 4 Online Question Answer
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# GATE Electronics and Communication Test 4 Online Question Answer

 Test Name GATE Electronics and Communication Test Subject GATE Test Type MCQs Total Question 40 Total Marks 80 Total Time 40 Minutes Test Help For M.Tech Admissions Government Jobs Post-Graduate Engineering Admissions Engineering Jobs

Graduate Aptitude Test in Engineering, GATE test is conduct for various undergraduate subjects in engineering and science departments examination. Electronics and Communication engineering students read subjects of electronic devices, circuits, communication equipment related transmitter, receiver, and integrated circuits. It is one of the most competitive examinations in India. From latest syllabus preparation purpose about Entry test, Jobs test, Admissions test and interviews on concept of Electronics and Communications Engineering test are following.

## GATE

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

The bias current IDC through the diodes is:

Question 1 of 40

2. The first six points of the 8-points DFT of a real valued sequence are 5, 1 - j3, 0, 3 - j4. The last two points of the DFT are respectively:

Question 2 of 40

3. A fair dice is tossed two times. The probability that the second toss results in a value that is higher than the first toss is:

Question 3 of 40

4. A transmission line of characteristic impedance 50Ω is terminated by a 50Ω load. When excited by a sinusoidal voltage source at 1GHz, the phase difference between two points spaced 2mm apart on the line is found to be π/4 radians. The phase velocity of the wave along the line is:

Question 4 of 40

5. The solution of the differential equation
= ky, y(0) = c is

Question 5 of 40

6. The channel resistance of an N-channel JFET shown in the figure below is 600Ω when the full channel thickness (tch) of 10μm is available for conduction. The built in voltage of the gate P+ N junction (Vbi) is -1 V. When the gate to source voltage (VGS) is 0 V, the channel is depleted by 1μm on each side due to the builtin voltage and hence the thickness available for conduction is only 8μm.
The channel resistance when VGS = 0 V is:

Question 6 of 40

7. For a BJTthe common base current gain α = 0.98 and the collector base junction reverse bias saturation current ICO = 0.6μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current IB = 20μA. The collector current Ifor this mode of operation is:

Question 7 of 40

8. A measure signal m(t) = cos 200πt + 4 cosπt modulates the carrier c(t) = cos 2π fct where fc = 1 MHZto produce an AM signal. For demodulating the generated AM signal using an envelope detector, the time constant RC of the detector circuit should satisfy:

Question 8 of 40

9. The channel resistance of an N-channel JFET shown in the figure below is 600Ω when the full channel thickness (tch) of 10μm is available for conduction. The built in voltage of the gate P+ N junction (Vbi) is -1 V. When the gate to source voltage (VGS) is 0 V, the channel is depleted by 1μm on each side due to the builtin voltage and hence the thickness available for conduction is only 8μm.

The channel resistance when VGS = -3 V is:

Question 9 of 40

10. Choose the word from the options given below that is most nearly opposite in the meaning to the given word:
Frequency

Question 10 of 40

11. Choose the most appropriate word from the options given below to complete the following sentence:Under ethical guidelines recently adopted by the Indian Medical Association, human genes are to be manipulated only to correct diseases for which _________ treatments are unsatisfactory.

Question 11 of 40

12. The circuit below implements a filter between the input current ii and the output voltage v0. Assume that the opamp is ideal. The filter implemented is a

Question 12 of 40

13. A silicon PN junction is forward biased with a constant current at room temperature. When the temperature is increased by 10ºC, the forward bias voltage across the PN junction

Question 13 of 40

14. A numerical solution of the equation f(x) = x + √x-3 = 0 can be obtained using Newton Raphson method. If the starting value is x = 2 for the iteration, the value of x that is to be used in the next step is:

Question 14 of 40

15. Choose the most appropriate word from the options given below to complete the following sentence:
It was her view that the country's problems had been ______ by foreign technocrats, so that to invite them to come back would be counter-productive.

Question 15 of 40

16. In the circuit shown below, capacitors C1 and C2 are very large and are shorts at the input frequency . v is a small signal input . The gain magnitude |V0/V1| at 10 M rad/s is:

Question 16 of 40

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

The ac output voltage vac is:

Question 17 of 40

18. In the circuit shown below, the initial charge on the capacitor is 2.5 mC, with the voltage polarity as indicated. The switched is closed time t = 0. The current i(t) at a time t after the switched is closed is:

Question 18 of 40

19. For the BJT QL in the circuit shown below, β = ∞ VBEon = 0.7V , VCEsat = o.7 V. The switch is initially closed. At time t = 0, the switched is open. The time t at which Q1 leaves the active region is

Question 19 of 40

20. There are two candidates P and Q in an election. During the campaign, 40% of the voters promised to vote for P, and rest for Q. However , on the day of election 15% of the voters went back on their promise to vote for P and instead voted for Q. 25% of the voters went back on their promise to vote for Q and instead voted for P. Suppose, P lost by 2 votes, then what was the total number of voters?

Question 20 of 40

21. A Zener diode, when used in voltage stabilization circuits, is biased in:

Question 21 of 40

22. In the circuit shown below, the network N is described by the following matrix:

Question 22 of 40

23. A transmission line of characteristic impedance 50W is terminated in a load impedance ZL. The VSWR of the line is measured by 5 and the first of the voltage maxima in the line is observed at a distance of λ/4 from the load. The value of ZL is:

Question 23 of 40

24. The modes in a rectangular waveguide are denoted by TEmn/TMmn where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide respectively.  Which one of the following statements is TRUE?

Question 24 of 40

25. The circuit shown below is driven by a sinusoidal input vi = Vp cos (t/RC). The steady state output v0 is:

Question 25 of 40

26. The system of equations
x + y + z = 6
x + 4y + 6z = 20
x +4y + λz = μ
has NO solution for values of λ and μ given by:

Question 26 of 40

27. In the circuit shown below, for the MOS transistors, μnCox = 100μA/V2 and the threshold voltage VT = 1V. The voltage Vx at the source of the upper transistor is:

Question 27 of 40

28. Given that f(y) = |y|/y, and q is any non-zero real number, the value of | f(q) - f(-q) is:

Question 28 of 40

29. In the circuit shown below, the Norton equivalent current amperes with respect to the terminals P and Q is:

Question 29 of 40

30. Drift current in the semiconductors depends upon:

Question 30 of 40

31. The logic function implemented by the circuit below is (ground implies logic 0)

Question 31 of 40

32. The value of the integral ∮c -3z + 4 / (z2 + 4z + 5)    dz where c is the circle |z| = 1 is given by

Question 32 of 40

33. In the circuit given below, the value of RL such that the power transferred to RL is maximum is:

Question 33 of 40

34. The output Y in the circuit below is always '1' when

Question 34 of 40

35. The trignometric Fourier series of an even function does not have the:

Question 35 of 40

36. An analog signal is band-limited to 4kHz, sampled at the Nyquist rate and the samples are quantized in to 4 levels. The quantized levels are assumed to be independent and equally probable. If we transmit two quantized samples per second , the information rate is _________ bits/second.

Question 36 of 40

37. When the output Y in the circuit below is 'I',  it implies that data has:

Question 37 of 40

38. An input x(t) = exp (-2t)u(t) + δ(t-6) is applied to an LTIsystem with impulse response h(t) = u(t). The out put is:

Question 38 of 40

39. The root locus plot for a system is given below. The open loop transfer function corresponding to this plot is given by:

Question 39 of 40

40. In the unit step response of a network is (1 - e-αt), then its unit impulse response is:

Question 40 of 40

 Test By Subject GATE Test By Topics Electronics and Communication Engineering
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