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ECE :: Measurements and Instrumentation

  1. Gauge factor of a strain gauge is

  2. A.
    unit change in resistance per unit change in length
    B.
    change in resistance per unit change in length
    C.
    unit change in length per unit change in resistance
    D.
    none of the above

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  3. Assertion (A): Capacitance effect can be used to measure thickness of sheets, displacement and pressure.

    Reason (R): Capacitance between two plates depends on the area of plates, distance between plates and permittivity of medium.

  4. 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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  5. The total insulation resistance consists of insulation volume resistance and surface leakage resistance.

  6. A.
    True
    B.
    False

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  7. Assertion (A): Energy meters use induction principle.

    Reason (R): Induction wattmeter is less accurate than a dynamometer wattmeter.

  8. 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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  9. A dynamometer wattmeter can be used for

  10. A.
    dc only
    B.
    ac only
    C.
    dc and 50 Hz ac
    D.
    dc and high frequency ac

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  11. If low pressure of 10-6 mm of Hg is required to be measured, we should use

  12. A.
    compound pressure gauge
    B.
    thermocouple vacuum gauge
    C.
    Pirani gauge
    D.
    ionization type vacuum gauge

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  13. A transducer must have

  14. A.
    good dynamic response
    B.
    good sensitivity
    C.
    good resolution
    D.
    all of the above

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  15. If two time varying signals of equal magnitude and zero phase displacement are applied to X and Y plates respectively; of CRO, the display will be

  16. A.
    a straight line
    B.
    a circle
    C.
    an ellipse
    D.
    a square

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  17. Wagner earthing device is used to eliminate error due to

  18. A.
    electromagnetic coupling
    B.
    electrostatic coupling
    C.
    both electrostatic and electromagnetic coupling
    D.
    either (a) or (b)

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  19. RTD is generally suitable for temperature up to

  20. A.
    about 800°C
    B.
    about 1500°C
    C.
    about 200°C
    D.
    about 50°C

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