GATE Electronics And Communication Test 2 Online Question Answer
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# GATE Electronics and Communication Test 2 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 Post-Graduate Engineering Admissions Engineering Jobs M.Tech Admissions Government Jobs

The Graduate Aptitude Test in Engineering (GATE) is a test that primarily tests the overall understanding of various undergraduate subjects in engineering and science. All interested candidates of Electronics and Communication engineering includes electronic devices, circuits, communication equipment like transmitter, receiver, and integrated circuits. For preparation latest entry test, admissions test, jobs test on concept of Electronics and Communications Engineering following.

## GATE

1. The small-signal resistance (i.e., dVB/dID) in kΩ offered by the n-channel MOSFET M shown in the figure below, at a bias point of V = 2 V is (device data for M: device Transconductance parameter kN = μn Cox (W/L) = 40μA/V², threshold voltage V = 1V, and neglect body effect and channel length modulation effects)

Question 1 of 40

2. In the circuit shown below, the keen current of the ideal Zener diode is 10 mA. To maintain 5V across R, the minimum value of R in Ω and the maximum power rating of the Zener diode in mW, respectively are:

Question 2 of 40

3. The impulse response of a system is u(t) = tu(t) . For an input u(t-1), the output is:

Question 3 of 40

4. The bit rate of a digital communication system is R kbits/s. The modulation used is 32-QAM. The minimum bandwidth required for ISI free transmission is:

Question 4 of 40

5. Let U and V be two independent and identically distributed random variables such that P(U = + 1) = P(U = -1) =1/2 . The entropy H(U + V) in bits is:

Question 5 of 40

6. In a MOSFET operating in the saturation region, the channel length modulation effect causes.

Question 6 of 40

7. The maximum value of θ until which the approximation sin θ = θ holds to within 10% error is:

Question 7 of 40

8. The magnetically uncoupled inductive coils have Q factors q1 and q2 at the chosen operating frequency. Their respective resistances are R1 and R2. When connected in series, their effective Q factor at the same operating frequency is:

Question 8 of 40

9. The current IS in Amps in the voltage source, and voltage VS in Volts across the current source respectively, are

Question 9 of 40

10. A band limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency which is not valid is:

Question 10 of 40

11. A bulb in a staircase has two switches, one switch being at the ground floor and the other one at the first floor. The bulb can be turned ON and also can be turned OFF by any one of the switches irrespective of the state of the other switch. The logic of switching of the bulb resembles.

Question 11 of 40

12. Statement: You can always give me a ring whenever you need. Which one of the following is the best inference from the above statement?

Question 12 of 40

13. In the circuit shown below, Q1 has negligible collector-to- emitter saturation voltage and the diode drops negligible voltage across it under forward bias. If Vcc is + 5V, X and Y are digital signals with 0 V as logic 0 and Vcc as logic 1, then the Boolean expression for Z is:

Question 13 of 40

14. Choose the grammatically CORRECT sentence:

Question 14 of 40

15. A voltage 1000 sinωt Volts is applied across YZ. Assuming ideal diodes. the voltage measured across WX in Volts, is:

Question 15 of 40

16. The signal flow graph for a system is given below. The transfer function Y(s)/U(s) for this system is

Question 16 of 40

17. Bits 1 and 0 are transmitted with equal probability. At the receiver, the pdf of the respective received signals for both bits are shown below.
The optimum threshold to achieve minimum bit error rate (BER) is:

Question 17 of 40

18. Three capacitors C, C and C whose values are 10µF, 2µF respectively, have breakdown voltages of 10V, 5V and 2V respectively. For the interconnection shown below, the maximum safe voltage in Volts that can be applied across the combination and the corresponding total charge in µC stored in the effective capacitance across the terminals are respectively.

Question 18 of 40

19. The schematic of an NMOS common source stage is shown in the figure below, where part of the biasing circuits has been omitted for simplicity. For the n-channel MOSFET M, the Transconductance gm = 1mA/V, and body effect and channel length modulation effect are to be neglected. The lower cutoff frequency in Hz of the circuit is approximately at:

Question 19 of 40

20. For 8085 microprocessor, the following program is executed
MVI A, 05H;
MVI B, 05H;
DCR B;
JNZ PTR;
HLT;
At the end of program, accumulator contains

Question 20 of 40

21. Consider a delta connection of resistors and its equivalent star connection as shown below. If all elements of the delta connection are selected by a factor k, k > 0, the elements of the corresponding star equivalent will be scaled by a factor of

Question 21 of 40

22. The open-loop transfer function of a dc motor is given as ω(s)/V(s)   =   10/1 + 10s , when connected is feedback as shown below, the approximate value of K that will reduce the time constant of the closed loop system by one hundred times as compared to that of the open - loop system is:

Question 22 of 40

23. A car travels 8 km in the first quarter of an hour, 6 km in the second quarter and 16 km in the third quarter. The average speed of the car in km per hour over the entire journey is:

Question 23 of 40

24. The following arrangement consists of an ideal transformer and an attenuator which attenuates by a factor of 0.8. An ac voltage V = 100V is applied across WX to get an open circuit voltage VYZ1 across YZ. Next, an ac voltage VYZ2 = 100V is applied across YZ to get an open circuit voltage VWX2 across WX. Then, VYZ1/VWX1, VWX2/VYZ2 are respectively.

Question 24 of 40

25. Consider two identically distributed zero-mean random variables U and V. Let the cumulative distribution functions of U and 2V be F(x) and G(x) respectively. Then, for all values of x

Question 25 of 40

26. In a voltage - voltage feedback as shown below, which one of the following statements is TRUE if the gain k is increased?

Question 26 of 40

27. In a forward biased pn junction diode, the sequence of events that best describes the mechanism of current flow is

Question 27 of 40

28. The current in the 1Ω resistor in Amps is:

Question 28 of 40

29. In the circuit shown below, if the source voltage Vs = 100∠53.13º V then the Thevenin's equivalent voltage in Volts as seen by the load resistance RL is:

Question 29 of 40

30. In the circuit shown below, the silicon npn transistor Q has a very value of β. The required value of R2 in kΩ to produce IC = 1mA is:

Question 30 of 40

31. Which one of the following statements is NOT TRUE for a continuous time causal and stable LTI system?

Question 31 of 40

32. In IC technology, dry oxidation (using dry oxygen) as compared to wet oxidation (using steam or water vapour) produces

Question 32 of 40

33. A polynomial f(x) = a4x⁴ + a3x³ + a2x² + a1x - a0 with all coefficients positive has

Question 33 of 40

34. For a periodic signal v(t) = 30 sin 100t + 10 cos 300t + 6 sin (500t + π/4), the fundamental frequency in rad/s

Question 34 of 40

35. Two system with impulse responses h1 (t) and h2 (t) are connected in cascade. Then the overall impulse response of the cascaded system is given by:

Question 35 of 40

36. The impulse response of a continuous time system is given by h(t) = δ(t - 1) + δ(t - 3). The value of the step response at t = 2 is:

Question 36 of 40

37. In the circuit shown below the op-amps are ideal. The Vout in Volts is:

Question 37 of 40

38. In the circuit shown below what is the output voltage (Vout) of a silicon transistor Q and an ideal op-amp are used?

Question 38 of 40

39. Bits 1 and 0 are transmitted with equal probability. At the receiver, the pdf of the respective received signals for both bits are shown below.
If the detection threshold is 1. the BER will be

Question 39 of 40

40. A system described by a linear, constant coefficient, ordinary first order differential equation has an exact solution given by y(t) for > t 0, when the forcing function is x(t) and the initial condition is y(0). If one wishes to modify the system so that the solution becomes -2y(t) for t > 0, we need to

Question 40 of 40

 Test By Subject GATE Test By Topics Electronics and Communication Engineering