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ECE :: Exam Questions Paper

  1. Polarization is a measure of

  2. A.
    dielectric constant per unit volume
    B.
    voltage gradient to produce electrical breakdown
    C.
    product of charge and distance
    D.
    excess charge density

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  3. Thin gate oxide in a CMOS process in preferably grown using

  4. A.
    wet oxidation
    B.
    dry oxidation
    C.
    epitaxial deposition
    D.
    ion implantation

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  5. Which of the following devices is a 'hot-electron' diode?

  6. A.
    Thermionic tube diode
    B.
    Schottky-Barrier diode
    C.
    Thomson-Deletion diode
    D.
    Thermal electron diode

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  7. If D, G and η denote the directly, power gain and efficiency of an antenna, then which of the following relation holds :

  8. A.
    DGη = 1
    B.
    η = DG
    C.
    D = ηG
    D.
    D = G/η

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  9. A system described by the transfer function is stable. The constraints on a and K are

  10. A.
    a > 0, ak < 3
    B.
    a > 0, ak > 3
    C.
    a < 0, ak > 3
    D.
    a < 0, ak < 3

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  11. Consider a random noise voltage which has a uniform density function as shown in the figure and is known to be white.

    If the noise is the first quantized into 0.1 V steps, starting at 0 V level, and then readings made of 10 per second. The information content of the reading is :

  12. A.
    2 bits/reading
    B.
    5 bits/reading
    C.
    10 bits/reading
    D.
    none of these

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  13. Consider the following statements:
    The bias stability of an emitter-bias amplifier circuit improves by

    1. decreasing the value of RB
    2. increasing the value of RE
    3. decreasing the value of RB
    4. increasing the value of RB
    5. increasing the value of RC
    Which of the above statements are correct?

  14. A.
    1 and 2
    B.
    2 and 3
    C.
    3 and 4
    D.
    4 and 5

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  15. Consider the following:

    1. Si
    2. Ge
    3. GaAs
    4. InP
    Which of the above semiconductors should be used for making highly efficient photodiodes?

  16. A.
    1 and 4 only
    B.
    3 and 4 only
    C.
    1, 3 and 4
    D.
    2, 3 and 4

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  17. Which device can detect the presence of both forward and backward waves in a waveguide?

  18. A.
    Filter
    B.
    Detector
    C.
    Directional coupler
    D.
    Magic T

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  19. The correct sequence of subsystems in an FM receiver is

  20. A.
    Mixer, RF amplifier, Limiter, IF amplifier. Discriminator, Audio amplifier
    B.
    RF amplifier, Mixer, IF amplifier, Limiter, Discriminator, Audio amplifier
    C.
    RF amplifier, Mixer, Limiter, Discriminator IF amplifier, Audio amplifier
    D.
    Mixer, IF amplifier, RF amplifier, Audio amplifier, Discriminator

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