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ECE :: Exam Questions Paper

  1. The following circuit diagram resembles :

  2. A.
    logic 0
    B.
    logic 1
    C.
    f(A, B, C)= m(0, 1, 4, 6, 7)
    D.
    None of these

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  3. The voltage applied to an R-L circuit at t = 0 when switch is closed is 100 cos (100 t + 30°). The circuit resistance is 80 Ω and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?

  4. A.
    1 A
    B.
    2 A
    C.
    5 A
    D.
    10 A

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  5. How many distinct binary trees can be constructed with three nodes?

  6. A.
    1
    B.
    2
    C.
    3
    D.
    5

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  7. For determining the network functions of a two-port network, it is required to consider that

  8. A.
    all initial conditions remain same
    B.
    all initial conditions are zero
    C.
    part of initial conditions are equal to zero
    D.
    initial conditions vary depending on nature of network

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  9. Consider the CMOS circuit shown, where the gate voltage VG of the n-MOSEFT is increased from zero, while the gate voltage of the p-MOSFET is kept constant at 3 V. Assume that, for both transistor, the magnitude of the threshold voltage is 1 V and the product of the transconductor parameter and the (W/L) ratio, i.e. the quality μC0x(W/L), is 1mA. V-2.

    Estimate the output voltage V0 for VG = 1.5 V. [Hint: Use the approximate current voltage equation for each MOSEFT

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  11. Which of the following circuits come under the class of sequential logic circuits?

    1. Full adder
    2. Full subtractor
    3. Half adder
    4. J-K flip-flop
    5. Counter
    Select the correct answer from the codes given below:

  12. A.
    1 and 2
    B.
    1, 2 and 3
    C.
    3 and 4
    D.
    4 and 5

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  13. Which of the following measurements can be done using a counter?

    1. Pulse duration
    2. Interval between two pulses
    3. Amplitude of the pulse
    4. Rise time of a pulse
    Select the correct answer from the codes given below:

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

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  15. The transfer function of a tachometer is of the form :

  16. A.
    Ks
    B.
    K/s
    C.
    D.

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  17. The maximum power dissipation capacity of a transistor is 50 mW. If the collector emitter voltage is 10 V, what is the safe collector current that can be allowed through the transistor?

  18. A.
    5 mA
    B.
    2.5 mA
    C.
    10 mA
    D.
    25 mA

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  19. Consider the following statements regarding registers and latches:

    1. Registers are made of edge-triggered FFs, whereas latches are made from level-triggered FFs.
    2. Registers are temporary storage devices whereas latches are not.
    3. A latch employs cross-coupled feedback connections.
    4. A register stores a binary word whereas a latch does not.
    Which of the above statements is/are correct?

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

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