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ECE :: Exam Questions Paper

  1. In a network with twelve circuit elements and five nodes, what is the minimum number of mesh equations?

  2. A.
    24
    B.
    12
    C.
    10
    D.
    8

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  3. Consider the following:

    1. Coupling capacitor
    2. Emitter by-pass capacitor
    3. Emitter to base diffusion capacitance of the BJT
    4. Stray capacitance of the circuit.
    Which of these components in a R-C coupled amplifier control the lower cut-off frequency of the amplifier?

  4. A.
    1 and 2
    B.
    2 and 3
    C.
    3 and 4
    D.
    l and 4

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  5. When What is Y(j ω) ?

  6. A.
    B.
    X(j ω) H(j ω)
    C.
    X(j ω) + H(j ω)
    D.
    X(j ω) - H(j ω)

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  7. Assertion (A): A z-directed rectangular waveguide with cross-sectional dimensions 3 cm x 1 cm will support propagation at 4 GHz.

    Reason (R):
    where λ is the wavelength.

  8. A.
    Both A and R are individually true and R is the correct explanation of A
    B.
    Both A and R are individually true but R is not the correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

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  9. Consider differential equation with the initial condition y(0) = 0. Using Euler's first order method with a step size of 0.1, the value of y(0.3) is

  10. A.
    0.01
    B.
    0.031
    C.
    0.0631
    D.
    0.1

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  11. Consider the following statements:

    1. Taking 2's complement is equivalent to sign change.
    2. In the 2's complement representation the most significant bit (MSB) is zero for a positive number.
    3. In a 4 bit binary representation of a binary number A, A + 1's complement of A = 24.
    Which of the above statements are correct?

  12. A.
    1 and 2 only
    B.
    1 and 3 only
    C.
    2 and 3 only
    D.
    1, 2 and 3

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  13. Consider the following statements:

    1. Strictly speaking C supports 1-dimensional arrays only.
    2. An array element may be an array by itself.
    3. Array elements need not occupy contiguous memory locations.
    Which of the above statements is/are correct?

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

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  15. Consider the following circuit using an ideal OP-AMP. The I-V characteristics of the diode is described by the relation where VT = 25mV, I0 = 1mA and V is the voltage across the diode (taken as positive for forward bias). For an input voltage V1 = - 1 V, the output voltage V0 is

  16. A.
    0 V
    B.
    0.1 V
    C.
    0.7 V
    D.
    1.1 V

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  17. Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown?

  18. A.
    Only P has no cutoff- frequency
    B.
    Only Q has no cutoff- frequency
    C.
    Only P has no cutoff- frequency
    D.
    All there have cut-off frequency

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  19. Assertion (A): A rectifier with inductor filter is more efficient for high load current.

    Reason (R): In rectifier with inductor filter we can use a larger choke to reduce ripple, larger choke will have higher dc resistance which will result in lower dc output voltage for higher load current.

  20. A.
    Both A and R are individually true and R is the correct explanation of A
    B.
    Both A and R are individually true but R is not the correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

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