GATE Electronics and Communication Test Paper Online

1. An R-C ckt initially at rest has a step signal. The response v(t) across C is v(t) = 1 - e^-at If now there is initial voltage on C of 2 volts for the same step signal, v(t) is now

2. A parity check usually can defect:

3. The leakage current in CE configuration may be around:

4. A loop produces a maximum e.m.f. of 150 volts when rotated at 60 rev/sec in a field of magnetic induction 5000 gauss. The dimensions of the loops are:

5. Figures given simple equivalent ckts for CE and CB transistors.

Given R = 2500Ω, k₁ = 100, the value of r and k₂ are respectively given by

6. The range of signed decimal numbers that can be represented by 6-bit is complement numbers is:

7. The pole zero diagram Z(s) = V(s)/1(s) is shown in figure., i(t) = cos t, v(t) is given by:

8. The number of forward paths in the signal flow diagram shown below are:

9. For the given ckt, the time constant RC = 1 ms. The voltage v _i(t) = √2sin 10³t. The output voltage v₀(t) is equal to:

10. The number of bits in binary PCM system is increased from n to n + 1, As a result the signal to quantization  noise ratio will approve by a factor

11. Temperature coefficient of resistivity of inchrome wire is of order of:

12. Which of the following has a lowest resistivity?

13. The kinetic energy and the dc Brogile wavelength  of an electron that falls through a potential of 500V is:

14. The step response of RC series circuit is of the form:

15. A driving point impedance:
Z_d(s) = V(s)/1(s) = s+1/s+2
The system is initially at rest. For a voltage signal of unit step, the current i(t) through Z_d is given by

16. An FM signal with a modulation index 9 is applied to a frequency tripler. The modulation index in the output signal will be:

17. The assembly language instruction called MACRO is:

18. What value of L needed with AC of 20 pF for an oscillatory frequency of 110.7 MHz?

19. In a transistor, h_fe = 450 = 50, h_ie = 830Ω, h_oe = 10^-4 mho. Its output resistance when used in CB configuration is about:

20. An eight bit digital data 10101100 is fed to an ADC. The reference voltage is + 10 Volts. The analog output voltage will be:

21. The figure of merit f_T in a Bipolar junction Transister denotes the frequency at which the

22. In the given circuit, the voltage V_c across C at time t = ∞ is

23. The gain margin of a system with with open loop transfer function
G(s) H(s) = 2(1+s)/s² is:

24. The pc contains 0450 H and Sp contains 08D6H. What will be the content of pc and Sp following a CALL to subroutine at location 20 AF H?

25. If the number of bits per sample in PCM system is increased from improvement in signal to quantisation noise ratio will be:

26. The response to a step signal u(t) is given by Z - 2e^-2t. Then the response to the impulse signal 2 δ(t) is given by:

27. In a uniformly doped abrupt P-N junction the doping level of n side is four times the doping level of p-side. The ratio of the depletion layer width is:

28. The logic operation of two combination at circuits shown in the figures above

29. In the ckt V₀ is given by:

30. Steady state is reached with S open, S is closed at t = 0. At t = ∞ the voltage marked v is given by:

31. Given G(s) H(s) = K/s(s+1)(s+3), the point of intersection of asymptotes of the root loci with the real axis is:

32. For good stabilised brasing of the transistor of the CE amplifier we should have:

33. Consider the Bode magnitude plot shown in figure below. The transfer function H(s) is:

34. For a narrow band noise with Gaussian Gradrature components, the probability density function of its envelope will be:

35. A logical expression in the sum of produced (SOP) is suitable for implementation using

36. A parallel RLC circuit has a resonance frequency f₀ = 10⁶ Hz, Q = 100. The frequency at which the impedance becomes o.707 Z_max is given by:

37. The Laplace transformer of e^-atf(t) is:

38. A first order system initially at rest has for a signal u(t), the response 1-e^-t. If the signal is 2u(t) cos (t), the response will be:

39. A p.d. of 300V is applied to a series combination of 3μ fd and 9μ fd capacitors. The charge on each capacitor is:

40. The ckt shown in the figure below represents