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ECE :: Measurements and Instrumentation

Measurements and Instrumentation - Section 1
Measurements and Instrumentation - Section 2
Measurements and Instrumentation - Section 3
Measurements and Instrumentation - Section 4
Measurements and Instrumentation - Section 5
Measurements and Instrumentation - Section 6
Measurements and Instrumentation - Section 7
Measurements and Instrumentation - Section 8
Measurements and Instrumentation - Section 9
Measurements and Instrumentation - Section 10
Measurements and Instrumentation - section-11
Measurements and Instrumentation - Section-12

  1. Assertion (A): The sign and magnitude of displacement can be measured by an LVDT.

    Reason (R): LVDT is based on the principle of mutual inductance.

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

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  2. In Maxwell's bridge the unknown inductance is measured by comparing it with a standard capacitor.

    3. A.
    True
    B.
    False

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  3. Magnetic deflection sensitivity is defined as

    4. A.
    deflection/flux density
    B.
    (deflection/flux density)0.5
    C.
    (Deflection)0.5/flux density
    D.
    none of the above

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  4. Which of the following is active transducer?

    5. A.
    Photoelectric
    B.
    Photovoltaic
    C.
    Photoconductive
    D.
    Photoemissive

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  5. Which is the displacement transducer with excellent sensitivity, linearity and resolution?

    6. A.
    Incremental encoder
    B.
    Absolute encoder
    C.
    LVDT
    D.
    Strain gauge

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  6. The accuracy of a multimeter is about

    7. A.
    ± 0.5%
    B.
    ± 3%
    C.
    ± 0.01%
    D.
    ± 10%

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  7. Induction wattmeter is an absolute instrument.

    8. A.
    True
    B.
    False

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  8. In a current transformers

    9. A.
    the number of turns in primary and secondary windings are nearly equal
    B.
    the number of primary turns is very small as compared to number of secondary turns.
    C.
    the number of secondary turns is very small as compared to the number of primary turns
    D.
    either (a) or (c).

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  9. The time base of a high frequency CRO whose screen diameter is 10 cm is set at 10 μ sec/cm. The lowest frequency which can be fully displayed on the screen is

    10. A.
    more than 100 kHz
    B.
    equal to 100 kHz
    C.
    equal to 10 kHz
    D.
    less than 10 kHz

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  10. Eddy currents are essential for the deflecting torque of an induction wattmeter.

    11. A.
    True
    B.
    False

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