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ECE :: Signals and Systems

Signals and Systems - Section 1
Signals and Systems - Section 2
Signals and Systems - Section 3
Signals and Systems - Section 4
Signals and Systems - Section 5
Signals and Systems - Section 6
Signals and Systems - Section 7
Signals and Systems - Section 8
Signals and Systems - Section 9
Signals and Systems - Section 10
Signals and Systems - Section-11

  1. What about the stability of system in

    2. A.
    system is stable
    B.
    unstable
    C.
    stable at 0.4
    D.
    cant say

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  2. Which one most appropriate dynamic system?

    3. A.
    y(n) + y(n - 1) + y(n + 1)
    B.
    y(n) + y(n - 1)
    C.
    y(n) = x(n)
    D.
    y(n) + y(n - 1) + y(n + 3) = 0

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  3. An energy signal has G(f) = 10. Its energy density spectrum is

    4. A.
    10
    B.
    100
    C.
    50
    D.
    20

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  4. Consider Pole zero diagram as shown, If two Poles are moved in opposite direction towards ω = p/2 and -p/2, the filter will be

    5. A.
    change to high pass filter
    B.
    change to Band Pass filter
    C.
    remains same
    D.
    change to LPF

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  5. In an ac circuit the fundamental component of current wave lags the corresponding voltage wave by 20°. The third harmonic component of current wave lags the corresponding voltage by an angle.

    6. A.
    less than 20°
    B.
    more than 20°
    C.
    equal to 20°
    D.
    equal to or more than 20°

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  6. If and A + B is

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  7. A first order system will never be able to give a __________ response

    1. band stop
    2. band pass
    3. all pass
    Choose the correct option

    8. A.
    1, 2, 3 true
    B.
    1 and 3 true, 2 false
    C.
    1, 2 are true 3 is false
    D.
    1, 2 are false, 3 is true

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  8. In the given figure the ratio T/d is the duty factor.

    9. A.
    True
    B.
    False

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  9. If £[f(t)] = F(s), then £[f(t - T)] =

    10. A.
    est F(s)
    B.
    e-st F(s)
    C.
    D.

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  10. The z-transform of a particular signal is given
    where

    The system after implementation will be

    11. A.
    casual and stable
    B.
    non-casual and stable
    C.
    non-casual and unstable
    D.
    casual and unstable

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