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ECE :: Exam Questions Paper

  1. It is desired to design a phase shift oscillator using an FET having a gm = 5000 μSiemen, rd = 40 kΩ and feedback circuit value of R = 10 K. Then value of C for oscillator operation at 1 kHz and that of RD for A = 40 to ensure oscillator action are

  2. A.
    6.4 nF, 80 K
    B.
    6.5 nF, 10 K
    C.
    6.5 pF, 10 K
    D.
    65 pF, 80 K

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  3. The type of feedback in the following circuit diagram

  4. A.
    Voltage shunt
    B.
    Current-shunt
    C.
    Voltage series
    D.
    Current series

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  5. Modem warfare has changed from large scale clashes of armies to suppression of civilian populations. Chemical agents that do their work silently appear to be suited to such warfare; and regretfully, there exist, people in military establishments who think that chemical agents are useful tools for their cause, which of the following statements best sums up the meaning of the above passage:

  6. A.
    Modem warfare has resulted in civil strife.
    B.
    Chemical agents are useful in modem warfare.
    C.
    Use of chemical agents in warfare would be undesirable.
    D.
    People in military establishments like to use chemical agents in war.

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  7. The equation for loop currents I1 and I2 are __________

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  9. A power of 100 W is radiated from an isotropic radiator. The power radiated peer unit solid angle and the power density at a distance of 10 km from the antenna is respectively

  10. A.
    25 W, 10 W
    B.
    C.
    7.96 W, 0.08 μW
    D.
    0.08 μ W, 7.96 W

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  11. For signal flow graph shown in following figure determine the ratio X5|X1. Use Mason's gain formula for signal flow graph.

  12. A.
    B.
    C.
    D.
    None of these

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  13. Consider following statements :

    1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
    2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

  14. A.
    statement (1) is true and (2) is false
    B.
    statement (1) and (2) both are true
    C.
    statement (1) is false and (2) is true
    D.
    statement (1) and (2) both are false

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  15. The fourier transform of a voltage signal x(t) is X(f). The unit of X(f) is __________ .

  16. A.
    volts
    B.
    volt2
    C.
    volt/sec
    D.
    volt-sec

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  17. A diode detector load consists of 0.01 μF capacitor in parallel with a 5 k ohms resistor. The maximum depth of modulation without diagonal clipping at modulating frequency of 1000 Hz and 10 kHz is

  18. A.
    0.76, 0.24
    B.
    0.95, 0.3
    C.
    0.24, 0.76
    D.
    0.3, 0.95

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  19. The inconsistency of Ampere's law can be removed by adding __________ to it.

  20. A.
    displacement current density alone.
    B.
    conduction current density alone.
    C.
    displacement and conduction current densities.
    D.
    none of these

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