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Electronics and Instrumentation - section-1
  1. An ideal ammeter has ___________ resistance.

    2. A.

     Low
    B.

     Infinite
    C.

     Zero
    D.

     High

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  2. LVDT is an/a ___________ transducer.

    3. A.

     Magneto-strict ion
    B.

     Inductive
    C.

     Resistive
    D.

     Eddy current

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  3. Piezo – electric transducers work when we apply _____________ to it.

    4. A.

     Mechanical force
    B.

     Vibrations
    C.

     Illuminations
    D.

     Heat

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  4. A chopper amplifier

    5. A.

     Converts AC signal from low frequency to high frequency
    B.

     Converts DC signal from low frequency to high frequency
    C.

     Converts AC signal from low frequency to DC high frequency
    D.

     Converts DC signal from low frequency to high frequency

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  5. The sensitivity factor of strain gauge is normally of the order of

    6. A.

     1 to 1.5
    B.

     1.5 to 2.0
    C.

     0.5 to 1.0
    D.

     5 to 10

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  6. The change in resistance of a metal wire owing to strain is due to
    S1: Change in dimension of wire expressed by factor (1-2µ)
    S2: Change in resistance ?

    7. A.

     S1 is true & S2 is false
    B.

     S2 is true & S1 is false
    C.

     Both S1 & S2 are true
    D.

     Both S1 & S2 are false

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  7. The amplifier gain varies with frequency. This happens mainly due to

    8. A.

     Miller effect
    B.

     Presence of external and internal capacitance
    C.

     Logarithmic increase in its output
    D.

     Inter stage transformer

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  8. The negative feed back in an amplifier

    9. A.

     Reduces voltage gain
    B.

     Increases the voltage gain
    C.

     Increases the gain band width product
    D.

     Reduces the input impedances

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  9. The improper response time of the amplifier in the biomedical recorders

    10. A.

     Affects the gain of the amplifier
    B.

     Delays the signals
    C.

     Changes the shape of the waveform of the signal
    D.

     Attenuates the signals

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  10. Which of the following are piezo electric substances?
    1. Barium titanate
    2. Lead titanate
    3. Lead Zirconate
    4. Cadmium and sulphate

    11. A.

     1, 2 and 4
    B.

     1, 3 and 4
    C.

     1, 2 and 3
    D.

     2, 3 and 4

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