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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. Without a spectrum analyser, it is not possible to determine

    2. A.
    carrier frequency
    B.
    antenna pattern
    C.
    pulse width
    D.
    spurious signal strength and its location

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  2. A phase shifting transformer is used in conjunction with

    3. A.
    DC slide wire potentiometer
    B.
    Crompton potentiometer
    C.
    AC coordinate potentiometer
    D.
    Drysdale potentiometer

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  3. In a megger the controlling torque is provided by

    4. A.
    spring
    B.
    gravity
    C.
    coil
    D.
    eddy current

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  4. A 3-digit voltmeter having a resolution of 100 mV can be used to measure a maximum of

    5. A.
    100 V
    B.
    200 V
    C.
    1000 V
    D.
    5000 V

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  5. For measurement of high voltage capacitors the suitable bridge is

    6. A.
    Wien bridge
    B.
    modified De Sauty bridge
    C.
    Schering bridge
    D.
    either (a) or (b)

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  6. To avoid the effect of stray magnetic fields in ac bridge we can use

    7. A.
    magnetic screening
    B.
    Wagner earthing device
    C.
    wave filter
    D.
    transformer

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  7. A resistance strain gauge is usually

    8. A.
    wire grid type
    B.
    foil type
    C.
    any of these
    D.
    none of these

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  8. If n measurements of a quantity are made, the arithmetic mean is

    9. A.
    B.
    C.
    D.
    none of the above

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  9. Assertion (A): Secondary instruments require calibration at frequent intervals.

    Reason (R): Secondary instruments have many errors.

    10. 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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  10. In ac bridge measurements, 'Wagner ground' means

    11. A.
    a special RC connection to eliminate stray magnetic effects
    B.
    a special RC connection to eliminate stray capacitance effects
    C.
    an unwanted and unintended ground connection
    D.
    a large metal plate buried in ground connected to one corner of bridge

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