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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. As per BIS, the number of accuracy classes of instrument is

    2. A.
    5
    B.
    6
    C.
    7
    D.
    8

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  2. In most of instruments, the controlling torque is provided by

    3. A.
    fluid fraction
    B.
    spring
    C.
    eddy current
    D.
    either (a) or (c)

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  3. A 0-200 V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is

    4. A.
    1 kΩ
    B.
    200 kΩ
    C.
    100 kΩ
    D.
    50 kΩ

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  4. DC ampere hour meter is an indicating instrument.

    5. A.
    True
    B.
    False

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  5. The accuracy of measurement by ohmmeter is very good.

    6. A.
    True
    B.
    False

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  6. Hay's bridge is suitable for inductances having low L/R ratio.

    7. A.
    True
    B.
    False

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  7. Moving iron instrument can be used for ac only.

    8. A.
    True
    B.
    False

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  8. In electronic voltmeters the measuring device is a

    9. A.
    moving coil instrument
    B.
    moving iron instrument
    C.
    dynamometer instrument
    D.
    none of the above

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  9. An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be.

    10. A.
    θ
    B.
    2θ
    C.
    0.5θ
    D.
    0.25θ

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  10. The ac bridge in figure is balanced. Z1 = 100∠30°, Z2 = 150∠0°, Z3 = 250∠ - 40° Then Z4 =

    11. A.
    375∠70° Ω
    B.
    375∠ - 70° Ω
    C.
    150∠0° Ω
    D.
    150∠20° Ω

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