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ECE :: Exam Questions Paper

  1. The characteristic equation of a control system is given as s4 + 8s3 + 24s2 + 32s + K = 0. What is the range of values of K for this system to be stable?

  2. A.
    0 ≤ K < 80
    B.
    0 ≤ K < 100
    C.
    0 ≤ K < 2300
    D.
    0 ≤ K < 600

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  3. If a vector field is related to another vector field through which of the following is true? Note: C and Sc refer to any closed contour and any surface whose boundary is C.

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  5. A scheme shown below is to generate a wide band FM modulate signal.

    Narrow band FM has carrier frequency = 400 KHz
    Deviation ratio = 0.2
    Wide band FM has carrier frequency = 100 MHz
    Deviation ratio = 6
    Frequency multiplication factor is:

  6. A.
    30
    B.
    6
    C.
    250
    D.
    12

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  7. An amplitude modulated signal occupies a frequency range from 395 kHz to 405 kHz. If can be demodulated by which of the following?

  8. A.
    Using an envelope detector and filter
    B.
    Multiplying with a 395 kHz local signal
    C.
    Multiplying with a 405 kHz local signal
    D.
    Low pass filtering with cut off at 400 kHz

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  9. Following one is moving average system __________ .

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  11. Radiation efficiency of an antenna is defined as the ratio of

  12. A.
    Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter
    B.
    The frequency at which minimum power is radiated to the frequency at which maximum power is radiated
    C.
    Total power accepted from the transmitter to total power generated by the transmitter
    D.
    Power in main lobe to that in the side lobe

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  13. Which of the following factors are responsible to design IC logic gates to operated at a fixed supply voltage of 5 volts?

    1. Low heating of IC logic gates
    2. Compatibility with other logic gates
    3. Satisfactory and safe operation
    4. Standardization from IC manufacturing point of view.
    Select the correct answer from the codes given below:

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

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  15. Which of the following meters requires an external power source for its operation?

  16. A.
    P.M.M.C. meter
    B.
    Hot wire ammeter
    C.
    Electronic voltmeter
    D.
    Electrodynamometer

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  17. Which are of the following oscillators is well suited for the generation of wide range audio-frequency sine waves?

  18. A.
    RC phase-shift oscillator
    B.
    Wien-bridge oscillator
    C.
    Colpitts oscillator
    D.
    Hartley oscillator

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  19. The transfer function of a controller is given as Kp + Kd.s where Kp and Kd are constants. What type of controller is this?

  20. A.
    Proportional
    B.
    Proportional plus integral
    C.
    Proportional plus derivative
    D.
    Integral plus derivative

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