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ECE :: Exam Questions Paper

  1. In the signal flow graph of figure below, the gain C/R will be :

  2. A.
    11/9
    B.
    22/15
    C.
    24/23
    D.
    44/23

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  3. The resonant frequency of the circuit shown in figure is,

  4. A.
    1/22p Hz
    B.
    1/2p Hz
    C.
    1/4p Hz
    D.
    1/2p Hz

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  5. A short grounded vertical antenna has a length L which is 0.05λ at frequency f. If its radiation resistance at f is R ohms, then its radiation resistance at a frequency 2f will be

  6. A.
    R/2Ω
    B.
    C.
    2RΩ
    D.
    4RΩ

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  7. Which of the following is a solution to the differential equation ?

  8. A.
    x(t) = 3e-t
    B.
    x(t) = 2e-3t
    C.
    D.
    x(t) = 3t2

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  9. In the circuit shown, the device connected to Y5 can have address in the range

  10. A.
    2000 - 20FF
    B.
    2D00 - 2DFF
    C.
    2E00 - 2EFF
    D.
    FD00 - FDFF

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  11. In a certain network not containing any dependent sources, number of nodes = 4 and number of branches is equal to 6.

  12. A.
    4
    B.
    2
    C.
    3
    D.
    5

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  13. The following statements are true with respect to "Cascode Amplifier".

    1. The reduction in h12 and Miller capacitance result in negligible reverse internal feedback.
    2. A's is large loads cannot be connected.
    3. As a narrow band amplifier, it provides small range of cμ is reduced.
    4. As a narrow band amplifier it provides small range of frequencies parameters the effect of cμ reduces.

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

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  15. A 4 cm by 3 cm rectangular waveguide with air cavity, is operating at 12 GHz with TE11 mode. The cut-off frequency is:

  16. A.
    6.25 GHz
    B.
    4.75 GHz
    C.
    1.5 GHz
    D.
    8.75 GHz

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  17. For a bipolar transistor, avalanche multiplication factor depends on __________ .

  18. A.
    VCE
    B.
    VCB
    C.
    VBE
    D.
    none of these

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  19. In the following transistor circuit VBE = 0. 7 V, rc = 25mV/IE, and β and the capacitance are very large

    The mid-band voltage gain of the amplifier is approximately

  20. A.
    - 180
    B.
    - 120
    C.
    - 90
    D.
    - 60

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